Answers
Answer:
Carbon dioxide is used as a refrigerant, in fire extinguishers, for inflating life rafts and life jackets, blasting coal, foaming rubber and plastics, promoting the growth of plants in greenhouses, immobilizing animals before slaughter, and in carbonated beverages.
Related Questions
Which question is most important to developmental psychology?
A. How much do parents influence who a child becomes?
B. How can violent conflicts be prevented?
C. How does brain chemistry affect how we feel and act?
D. How can people change their thinking and behavior?
Answers
Answer:
For much of the past century, scientists studying drugs and drug use labored in the shadows of powerful myths and misconceptions about the nature of addiction. When scientists began to study addictive behavior in the 1930s, people with an addiction were thought to be morally flawed and lacking in willpower. Those views shaped society’s responses to drug use, treating it as a moral failing rather than a health problem, which led to an emphasis on punishment rather than prevention and treatment.
Today, thanks to science, our views and our responses to addiction and the broader spectrum of substance use disorders have changed dramatically. Groundbreaking discoveries about the brain have revolutionized our understanding of compulsive drug use, enabling us to respond effectively to the problem.
As a result of scientific research, we know that addiction is a medical disorder that affects the brain and changes behavior. We have identified many of the biological and environmental risk factors and are beginning to search for the genetic variations that contribute to the development and progression of the disorder. Scientists use this knowledge to develop effective prevention and treatment approaches that reduce the toll drug use takes on individuals, families, and communities.
Despite these advances, we still do not fully understand why some people develop an addiction to drugs or how drugs change the brain to foster compulsive drug use. This booklet aims to fill that knowledge gap by providing scientific information about the disorder of drug addiction, including the many harmful consequences of drug use and the basic approaches that have been developed to prevent and treat substance use disorders.
At the National Institute on Drug Abuse (NIDA), we believe that increased understanding of the basics of addiction will empower people to make informed choices in their own lives, adopt science-based policies and programs that reduce drug use and addiction in their communities, and support scientific research that improves the Nation’s well-being.
Answer:
D
Explanation:
the force that holds the atoms together is referred to as a
Answers
The Sun has been shining on this swimming pool all day. The water is much warmer than it was in the morning. Describe what is happening to the water in terms of temperature, particle speed, and kinetic energy.
Answers
Answer:
The waters' temp increased
Explanation:
The temperature of the water in the swimming pool has increased due to the heat from the Sun. As a result, the particles in the water are moving faster and have a higher kinetic energy than in the morning.
Based on a Kc value of 0.250 and the given data table, what are the equilibrium concentrations of XY, X, and Y , respectively?
Answers
From the solution that we have in the question;
The concentration of X and Y is 0.28 MThe concentration of XY is 0.32 MWhat is the equilibrium constant?The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.
It is a fundamental concept in chemical equilibrium.
The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.
Kc = [X] [Y]/[XY]
\(0.25 = (0.1 + x)^2/(0.5 - x)\)
\(0.25(0.5 - x) = (0.1 + x)^2\)
\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)
x = 0.18 M
The equilibrium amount of X and Y= 0.28 M and the equilibrium concentration of XY = 0.32 M
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Based on the answer to the question that we have;
A 0.28 M concentration of X and Y exists at equilibriumXY's concentration at equilibrium is 0.32 M.The equilibrium constantThe ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.
It is a cornerstone of the theory of chemical equilibrium.
A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.
Kc = [X][Y]/[XY]
\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)
The equilibrium concentration of;
XY =0.5 - 0.18
=0.32 M
Then the equilibrium amount of
X and Y is
0.1 + 0.18= 0.28 M.
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A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol.
Answers
A chemist determines that a substance is composed of 30.4% nitrogen by mass and 69.6% oxygen by mass. The molar mass of the compound is 230.5 g/mol, the molecular formula is NO₂.
We must compute the empirical formula in order to ascertain the compound's chemical composition.
If we have 100 grams of the compound.
This suggests we have:
30.4 g of nitrogen
69.6 g of oxygen
Now, we have to convert the mass of each element to moles.
The molar mass of nitrogen (N) = 14.01 g/mol
the molar mass of oxygen (O) = 16.00 g/mol.
Number of moles of nitrogen (N):
2.17 mol
Number of moles of oxygen (O):
4.35 mol
The simplest whole-number ratio between the moles of nitrogen and oxygen must now be determined. To calculate the ratio, we divide both numbers by the smaller value.
Moles N / moles O = 2.17 mol / 2.17 mol = 1.00
Moles O / moles O = 4.35 mol / 2.17 mol = 2.00
The ratio is approximately N₁O₂.
We divide the subscripts by their greatest common divisor to obtain the simplest ratio, since we are looking for the empirical formula. The empirical formula is NO₂ since the greatest common divisor in this situation is 1.
The molecular formula of the compound is NO₂.
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How many equivalents of acid are in an acid sample that requires 23.67 mL of 0.1467 N
NaOH solution to reach the endpoint?
Answers
Determine the initial concentration of hypochlorous acid that would result in a solution with a pH of 3.2Ka = 3.0 x 10^-8
Answers
To answer this question, we will need to use an ICE table.
So, we start with the concentration we want to calculate, [HClO].
The dissociation equilibrium is:
\(HClO\rightleftarrows H^++ClO^-\)At start, we only have HClO, so the first row of the table is:
HClO | H⁺ | ClO⁻
[HClO]i | 0 | 0
Now, suppose x dissociates at the equilibrium, so we would have:
HClO | H⁺ | ClO⁻
[HClO]i | 0 | 0
[HClO]i - x | x | x
Since the concentration of H⁺ will be x, we can calculate it by using the given pH:
\(\begin{gathered} pH=-\log \lbrack H^+\rbrack \\ x=\lbrack H^+\rbrack=10^{-pH}=10^{-3.2}\approx6.30957\times10^{-4}M \end{gathered}\)Now, we can figure the initial concentration of HClO by using the equilibrium equation:
\(Ka=\frac{\lbrack H^+\rbrack\lbrack ClO^-\rbrack}{\lbrack HClO\rbrack}\)From the ICE table, we have:
\(\begin{gathered} \lbrack H^+\rbrack=x\approx6.30957\times10^{-4}M \\ \lbrack ClO^-\rbrack=x\approx6.30957\times10^{-4}M \\ \lbrack HClO\rbrack=\lbrack HClO\rbrack_i-x=\lbrack HClO\rbrack_i-6.30957\times10^{-4}M \end{gathered}\)Thus:
\(3.0\times10^{-8}=\frac{6.30957\times10^{-4}M\cdot6.30957\times10^{-4}M}{\lbrack HClO\rbrack_i-6.30957\times10^{-4}M}\)Now, we can solve for [HClO]i:
\(\begin{gathered} 3.0\times10^{-8}=\frac{6.30957\times10^{-4}M\cdot6.30957\times10^{-4}M}{\lbrack HClO\rbrack_i-6.30957\times10^{-4}M} \\ 3.0\times10^{-8}(\lbrack HClO\rbrack_i-6.30957\times10^{-4}M)=3.98107\times10^{-7}M \\ 3.0\times10^{-8}\lbrack HClO\rbrack_i-1.89287\times10^{-11}=3.98107\times10^{-7}M \\ 3.0\times10^{-8}\lbrack HClO\rbrack_i=3.98107\times10^{-7}M+1.89287\times10^{-11}M \\ 3.0\times10^{-8}\lbrack HClO\rbrack_i=3.98126\times10^{-7}M \\ \lbrack HClO\rbrack_i=\frac{3.98126\times10^{-7}M}{3.0\times10^{-8}} \\ \lbrack HClO\rbrack_i\approx0.1327M \end{gathered}\)Thus, the initial concentration is approximately 0.1327 M.
What is the mass (in grams) of 11.50 L of propane vapor (C₂H₂) at
STP? R=0.08314 L-bar/mol-K.
Answers
The mass in grams of 23.0 L of propane vapor at STP is 22.968 g.
How do you explain mole concept ?The definition of a mole is a measure of material quantity. It is a unit of measurement used to determine how many elementary particles make up a specific material.It has a precise definition of 6.022 1023 elementary entities. Depending on the kind of substance, the elementary unit may be a molecule, atom, or ion. Avogadro's number is the quantity of elementary particles in a mole.As a good method of expressing the quantities of reactants and products, it is commonly used in chemistry.For all intents and purposes, the mass of one mole of a substance measured in grams and daltons is roughly same.The units for molar mass are grams per mole. For molecules, the atomic mass is equal to the molar mass, or weight, in grams that each mole of atoms contains.Given data :
No of moles=23/44=0.522 molesNo of moles in 44 liter = 0.522 moles.So the mass of 23 L of propane is 44×0.522 = 22.968 g.
Therefore, 23 liters of propane contain 22.968 g of propane at STP.
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Need help with this two part question
Answers
The ideal gas law and stoichiometry must be used to calculate the volume of carbon dioxide gas produced by the breakdown of 4.09 g of calcium carbonate at STP (Standard Temperature and Pressure).
Use the molar mass of calcium carbonate (CaCO3) to determine how many moles it contains. CaCO3 has a molar mass of 100.09 g/mol.
CaCO3 mass divided by its molar mass equals the number of moles of CaCO3: 4.09 g/100.09 g/mol.
The number of moles of carbon dioxide (CO2) generated may be calculated using the stoichiometric ratio from the balancing equation. By using the equation:
A unit of CaCO3 and CO2 is produced.
CO2 moles equal the same number of moles of CaCO3.
Use the ideal gas law to translate the volume of carbon dioxide into moles.
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What is the calibration of this graduated cylinder? calibration
A. 5 mL
B. 2 mL
C. 1 mL
D. 10 mL
Answers
The answer is 1ml. The answer is 1ml because of calibration of this graduated cylinder
Answer:
1 mL
Explanation:
According to your definition, it is the difference between marked spaces divided by the # of spaces between marked values.
Difference between 2 marked values: 5 mL
# Of Spaces between marked values: 5
Calibration: 5 mL / 5 mL = 1 mL
............................................................................................................................
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Answer:
............................................................................................................................
Explanation:
because ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Need answers asap!!!!!!!!!
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The water cycle, also known as the hydrologic cycle, is the continuous movement of water on, above, and below the surface of the Earth.
What is the water cycle?The water cycle involves a series of physical processes, including evaporation, condensation, precipitation, and runoff, that work together to move water from one location to another and to maintain the balance of water on Earth.
The water cycle begins when water from oceans, lakes, rivers, and other bodies of water evaporates into the atmosphere due to the heat from the sun. As water vapor rises into the atmosphere, it cools and condenses into clouds. When the clouds become saturated with water vapor, precipitation occurs in the form of rain, snow, sleet, or hail.
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Name the structure CH3coch2c(br)2ch2ch3
Answers
The name of the compound from the structure that we can see in the question is;
4,4-dibromohex-2one
Summary of how you name an organic compoundThe International Union of Pure and Applied Chemistry (IUPAC) established a systematic set of guidelines for naming organic compounds.
Find the compound's longest continuous chain of carbon atoms. The compound's name is derived from this chain, which also acts as the compound's parent chain.
Assign a number to each carbon atom in the parent chain to give each carbon atom in the compound a special identification. The end that is closest to the functional group or substitutes is where the numbering begins.
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Does the color of a potion matter
Answers
answer: what
explanation: what
Explain in complete sentences how heat is transferred in fluids?
Answers
The process of heat transfer in fluids is known as convection and it involves the actual movement of the molecules of the fluids from hotter to cooler regions as a result of decrease in the density of the heated molecules.
What is the name given to the process of heat transfer in fluids?
The name given to the process of heat transfer in fluids is convection.
Convective heat transfer, frequently referred to as convection, is the movement of fluids that transfers heat from one location to another.
In convection, heat energy is carried by the moving fluid. The fluid moves from one area with a high temperature to another with a low temperature. In liquids and gases, it is typically the predominant type of heat transmission.
This particular technique of heat transport combines the conduction (heat diffusion) and advection processes (heat transfer by bulk fluid flow).
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Polyethylene is 86.0% C and 14.0%
H. Determine the empirical formula of the compound.
Percent to Mass: How many grams of C/and Hare present in 100.0 g?
Answers
The empirical formula of polyethylene can be determined by converting the given percentages of carbon (C) and hydrogen (H) into grams. To find the grams of each element, we assume a 100.0 g sample of polyethylene.
For carbon:
Mass of carbon = 86.0% × 100.0 g = 86.0 g
For hydrogen:
Mass of hydrogen = 14.0% × 100.0 g = 14.0 g
Therefore, in a 100.0 g sample of polyethylene, there are 86.0 grams of carbon and 14.0 grams of hydrogen.
The empirical formula of a compound represents the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula, we need to find the ratio of carbon to hydrogen in terms of moles.
First, we convert the masses of carbon and hydrogen into moles using their respective molar masses. The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of hydrogen is approximately 1.008 g/mol.
Number of moles of carbon = 86.0 g / 12.01 g/mol ≈ 7.162 mol
Number of moles of hydrogen = 14.0 g / 1.008 g/mol ≈ 13.89 mol
Next, we divide the number of moles of each element by the smallest number of moles to get a simplified ratio.
Carbon: Hydrogen ≈ 7.162 mol : 13.89 mol ≈ 1 : 1.939
Since we want to express the ratio in whole numbers, we multiply both sides by 2 to get a whole number ratio.
Carbon: Hydrogen ≈ 2 : 3.878
Rounding to the nearest whole number, we find that the empirical formula of polyethylene is CH₂.
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Which property does an acid have?
tastes bitter
reacts with metals
tastes salty
feels slippery
Answers
An acid have a property to reacts with metals.
What is acid?An acid is a substance which produces H⁺ ion in the aqueous solution.
An acid has a property to react with metal to produce salt and hydrogen gas, in the given way:
2HCl + M²⁺ → H₂ + MCl
Acid has a sour taste and base has a bitter taste.
Hence, an acid have a property to reacts with metals.
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A balloon has a volume of 145 mL at room temperature (25°C = 298°K). Alyssa decides to place the balloon in the freezer to see what happens. After being in the freezer for an hour, the balloon has a new volume of 35mL. What is the temperature inside the freezer?
Answers
The temperature inside the freezer is approximately -164°C.
To solve this problem, we can use the combined gas law equation:
\((P1V1)/T1 = (P2V2)/T2\)
where P is the pressure, V is the volume, and T is the temperature of the gas.
We know that the initial volume of the balloon is 145 mL and the final volume is 35 mL. We also know that the initial temperature is 25°C or 298 K, and we need to find the final temperature.
Assuming the pressure of the gas remains constant, we can rearrange the combined gas law equation to solve for the final temperature:
\(T2 = (P2V2/T1)(P1/V1)\)
Plugging in the values we know, we get:
\(T2 = (1 atm * 35 mL/298 K)(1 atm/145 mL) = 0.0808 atm/mL\)
Multiplying both sides by 298 K and dividing by 0.0808 atm/mL, we get:
T2 = 109.15 K or approximately -164°C
Therefore, the temperature inside the freezer is approximately -164°C.
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Other than lowering the cost of producing coins, what could be another added benefit of changing the metals used to make coins?(hint: think of the density...why would a metal that is less dense be beneficial?)
Answers
Answer:
See explanation
Explanation:
A coin is money made from metal stuff. Common coinage metals are copper, silver, nickel etc.
One consideration in coin production is the density of the coin. A coin of less density will have lesser mass and occupy a lesser volume. This makes it easier to carry the coin around.
Coins should therefore be made of low density metals so that they can easily be carried about.
This chart shows global energy usage for the year 2005. Solar, 0.5% Hydroelectric, 3% Wind, 0.3% Biomass Geothermal, 0.2% Nuclear Oil 379 Natural gas 23% Need an extra pair of e Get writing feedback fri real tutor Submit a review Coal Use the chart to answer the following questions. (8 points) A. What total percent of energy came from fuels that emitted greenhouse gases?
Answers
Approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.
To determine the total percent of energy that came from fuels emitting greenhouse gases, we need to consider the energy sources listed in the chart that are known to produce greenhouse gas emissions. In this case, those would be oil, natural gas, and coal.
From the chart, we see that the percentages for these three energy sources are:
Oil: 37.9%
Natural gas: 23%
Coal: Not specified
Although the percentage for coal is not mentioned in the given information, it is a known fact that coal combustion releases greenhouse gases, including carbon dioxide (CO2). Therefore, we can assume that coal is among the fuels emitting greenhouse gases.
Adding up the percentages for oil and natural gas, we have:
37.9% (oil) + 23% (natural gas) = 60.9%
Therefore, approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.
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The chemical and mechanical breakdown of rock is called
A) reclamation
B) composting
C) incineration
D) continental drift
E) weathering
Answers
Answer:
Weathering
Explanation:
can l be the brainliest
A food item that is left out of the refrigerator turns brown and forms bubbles and gas. What are the signs that this is a chemical reaction?
Check all that apply.
Heat is produced.
Heat is absorbed.
Bubbles appear.
A precipitate forms.
The color changes.
Answers
Answer:
C & E
Explanation:
8. What is the chemical formula for sulfuric acid? Explain in great detail.
Answers
The chemical formula for sulfuric acid is H2SO4.
Detailed explanation:
This means that there are 2 atoms of hydrogen, 1 atom of sulfur, and 4 atoms of oxygen in a single molecule. Hope this helps!
The answer is H2SO4.
Analyse the step-by-step of guiding students on how to write balanced chemical equations and ionic equation
Answers
Here is a step-by-step guide for guiding students on how to write balanced chemical equations and ionic equations:
Steps:
1. Determine the reactants and products: Start by identifying the reactants and products in the chemical reaction. This involves reading the problem and identifying the substances that are being reacted.
2. Write the unbalanced equation: Once the reactants and products have been identified, write the unbalanced chemical equation using the chemical formulas for each reactant and product.
3. Balance the equation: To balance the equation, adjust the coefficients of the reactants and products so that the number of atoms of each element is equal on both sides of the equation. Begin by balancing the atoms of elements that appear only once on each side of the equation, and then move on to elements that appear more than once.
4. Check the balanced equation: After balancing the equation, double-check to make sure that the number of atoms of each element is the same on both sides of the equation.
5. Write the ionic equation: To write the ionic equation, break apart any soluble ionic compounds into their individual ions. Then, cancel out any spectator ions that appear on both sides of the equation.
6. Check the ionic equation: Double-check the ionic equation to make sure that the same number and type of ions appear on both sides of the equation.
7. (Optional) Include states of matter: It is common practice to include the states of matter (solid, liquid, gas, aqueous) of the reactants and products in the chemical equation. This can be done by using abbreviations in parentheses after each chemical formula.
By following these steps, students can learn how to write balanced chemical equations and ionic equations accurately and efficiently.
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2) Assuming a constant pressure, if the heated air had a temperature 100 deg * C and the water cooled the air to 25 deg * C what was the volume of the deflated balloon ?
Answers
The Charles law can give the new volume of the gas.
What is the new volume?This question is incomplete as the value of the initial volume was not shown. I can help you if I can point you to the Charles 's law.
We know that according to the Charles's law, the volume of a given mass of gas is directly proportional to the temprateure at a constnat pressure. This is the case eher. We would need to know the initial volume of the gas so that we can be able to use the Charlee's law in helping us to obtain the new volume of the gas.
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Consider the following reaction
2 N2 (g) + O2 (g) —-> 2 N2O (g) FinalH = + 163.2 kJ/mol
b) How much heat is required to produce 25.0 g of N2O by this reaction? Show all calculations.
Answers
Answer:
92.72 kJ
Explanation:
2 N₂ (g) + O₂ (g) —-> 2 N₂O
According to question , one mole of N₂O requires 163.2 kJ of heat
Molecular weight of N₂O = 44 gm
25 g N₂O = 25 / 44 mole
25 / 44 mole will require 163.2 x 25 / 44 kJ
= 92.72 kJ
c) Discuss precision and Accuracy as they relate to types of errors.
what is the answer
Answers
Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.
Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.
Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.
Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.
Errors in measurements can be classified into two types: random errors and systematic errors.
Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.
Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.
In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.
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What is the total mass of copper consumed when 16.0 moles of water are produced?
Answers
When we want to relate quantities in reactions, first, if nothing is said about incomplete reaction, we assume it is complete.
Next, we can start by seing what we want to calculate. In this case is the mass o Cu:
\(m_{Cu}\)Since the quantities of reactions are in number of moles, we will need to first get the number of moles of Cu, so we have to do the following:
\(\begin{gathered} M_{Cu}=\frac{m_{Cu}}{n_{Cu}} \\ m_{Cu}=n_{Cu}M_{Cu} \end{gathered}\)Now, we need to know the number of moles of Cu and its molar mass.
The molar mass of Cu is simply its atomic mass:
\(M_{Cu}=63.546g/mol\)Now, the only other component we have information about is the number of moles of H₂O, so we need to make the stoichiometry to see how many moles of Cu is equivalent to the number of moles of H₂O in this reaction:
Cu --- H₂O
3 --- 4
\(\begin{gathered} \frac{n_{Cu}}{3}=\frac{n_{H_2O}}{4} \\ n_{Cu}=\frac{3n_{H_2O}}{4} \end{gathered}\)So, updating our equation, we have:
\(m_{Cu}=n_{Cu}M_{Cu}=\frac{3n_{H_{2}O}}{4}M_{Cu}\)Since we know the number of moles of water is 16.0 mol, we can substitute the values we have now:
\(\begin{gathered} m_{Cu}=\frac{3n_{H_2O}}{4}M_{Cu} \\ m_{Cu}=\frac{3\cdot16.0mol}{4}63.546g/mol \\ m_{Cu}=3\cdot4\cdot63.546g \\ m_{Cu}=12\cdot63.546g \\ m_{Cu}=762.552g\approx763g \end{gathered}\)We got a slight different result from the alternatives, but it can vary depending on the molar mass used.
So, the answer is 762 g.
Calculate the pH when 50ml of 0.180M NH3 is mixed with 5ml of 0.360M HBr. The Kb of ammonia is 1.77×10^-5
Answers
The pH of the resulting solution after mixing 50 mL of 0.180 M \(NH_{3}\) with 5 mL of 0.360 M HBr is approximately 11.56.
To calculate the pH of the resulting solution after mixing NH3 and HBr, we need to consider the reaction between NH3 (ammonia) and HBr (hydrobromic acid).
First, let's write the balanced chemical equation for the reaction:
\(NH_{3} + HBr - > NH_{4+} + Br-\)
We can see that \(NH_{3}\) acts as a base and HBr acts as an acid, forming the ammonium ion (\(NH_{4+}\)) and bromide ion (Br-).
Next, we'll determine the initial moles of NH3 and HBr:
Moles of NH3 = concentration (M) × volume (L) = 0.180 M × 0.050 L = 0.009 mol
Moles of HBr = concentration (M) × volume (L) = 0.360 M × 0.005 L = 0.0018 mol
Since NH3 and HBr react in a 1:1 ratio, NH3 will be completely consumed, and we'll be left with 0.009 - 0.0018 = 0.0072 mol of NH4+ ions.
Now, let's calculate the concentration of NH4+ ions in the final solution:
Volume of the final solution = 50 mL + 5 mL = 55 mL = 0.055 L
Concentration of NH4+ ions = moles / volume = 0.0072 mol / 0.055 L = 0.131 M
Next, we need to calculate the pOH of the solution using the Kb of ammonia:
\(Kb = [NH_{4+}][OH-] / [NH_{3}]\)
Since the concentration of NH4+ is equal to the concentration of OH- in this case, we can rewrite the equation:
\(Kb = [OH-]^2 / [NH3]\\[OH-] = sqrt(Kb * [NH3]) = sqrt(1.77*10^-5 * 0.131) = 3.62*10^-3 M\)
Now, we can calculate the pOH:
\(pOH = -log10([OH-]) = -log10(3.62*10^-3) = 2.44\)
Finally, we can calculate the pH using the equation:
pH = 14 - pOH = 14 - 2.44 = 11.56
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Name 2 ways heat can be transferred through convention.
Answers
Answer:
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat. If there is a temperature difference between two systems heat will always find a way to transfer from the higher to lower system.
Explanation: