Which statement is the best example of an object and motion that would make it hard for people to accept Newton’s first law? A rolling ball eventually slows down and comes to a stop. A wagon must be pushed before it begins to move. The heavier the load in a cart, the harder the cart is to turn. A box does not move when pushed equally from opposite sides.
Answers
Answer:
A rolling ball eventually slows down and comes to a stop
Explanation:
It goes against newtons law making it hard for people to think is correct
have a great day!!!
The statement which is the best example of an object and motion that would make it hard for people to accept Newton’s first law is that a rolling ball eventually slows down and comes to a stop.
What is newtons first law?Newton's first law states that if any body is present at rest or moving in a particular path then that body will remain at rest position and moving motion untill and unless any external force is acted upon that.
A rooling body eventually slows down or stop is impossible without acting any force on it.A wagon vehicle is pushed before moving also follows the first law.It is harder to turn a cart if it is heaviest loaded is also an example of newtons first law because in this we have to apply external force to move.If we apply equal and opposite force to a box then it will not move and it is true so.Hence incorrect statement is a rolling ball eventually slows down and comes to a stop.
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Related Questions
a nurse is providing teaching to an older adult client who has constipation. which of the following statements should the nurse include in the teaching?
Answers
A nurse is providing teaching to an older adult client who has the constipation. The statement which is true for the nurse include in the teaching is the correct option is c. Sit on the toilet 30 min after eating a meal.
Sitting on the toilet for the 30 min after the eating a meal, even you are feeling the urge to defecate, is the good method of bowel retraining to treat the constipation. Constipation is the difficulty to pass out the the stool and it occurs when the waste or the stool moves very slowly through the digestive tract or very difficult to be eliminated effectively trough the rectum, that cause the stool to become very hard and dry.
Thus, Sit on the toilet 30 min after eating a meal helps to treat the constipation.
This question is incomplete, the complete question is :
A nurse is providing teaching to an older adult client who has constipation. Which of the following statements should the nurse include in the teaching.
a. Drink a minimum of 1,000 mL of fluid daily.
b. Increase your intake of refined-fiber foods.
c. Sit on the toilet 30 min after eating a meal.
d. Take a laxative every day to maintain regularity.
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Many telescopes have been launched into orbit around Earth or sent out into deep space. What is an advantage of using these telescopes rather than an Earth-bound telescope to gather images?
Question
Telescopes launched into space are usually smaller than ones found on Earth.
The images are usually clearer because they do not have to look through our atmosphere.
It is easier for scientists to make adjustments to an orbiting telescope than a fixed telescope.
Orbiting telescopes usually last longer because it is cold in deep space.
Answers
The advantage of using telescopes launched into orbit around Earth or sent out into deep space is that the images gathered are usually clearer because they do not have to look through our atmosphere.
What is an atmosphere?
The atmosphere can distort and blur images, making it difficult to observe distant objects with high precision. By placing telescopes in space, scientists can avoid this problem and obtain much clearer and more detailed images of objects in the universe. Additionally, space telescopes can observe a wider range of the electromagnetic spectrum, including ultraviolet and infrared radiation, which are absorbed by Earth's atmosphere.
What is telescopes?
A telescope is an instrument used to observe and study distant objects in space by collecting and focusing electromagnetic radiation. Telescopes can be used to study visible light, infrared radiation, ultraviolet radiation, X-rays, and other forms of electromagnetic radiation. They are important tools in astronomy and have helped scientists make many discoveries about the universe. There are many different types of telescopes, including refracting telescopes, reflecting telescopes, and radio telescopes.
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5.86 ■ Liquid oxygen for use as a rocket fuel can be produced by cooling dry air to −183°C, where the O2 condenses. How many liters of dry air at 25°C and 750 torr would need to be processed to produce 150 L of liquid O2 at −183°C? (The mole fraction of oxygen in dry air is 0.21, and the density of liquid oxygen is 1.14 g/mL.)
Answers
Approximately 631.5 liters of dry air at 25°C and 750 torr would need to be processed to produce 150 liters of liquid \(O_2\) -183°C.
To solve this problem, we need to consider the ideal gas law and the molar volume of gases.
First, we can calculate the number of moles of oxygen in 150 L of liquid \(O_2\) at -183°C. To do this, we divide the mass of liquid oxygen by its molar mass:
Mass of liquid oxygen = volume of liquid oxygen * density of liquid oxygen = 150 L * 1.14 g/mL = 171 g
Molar mass of oxygen (O2) = 32 g/mol
Number of moles of oxygen = mass of oxygen / molar mass of oxygen = 171 g / 32 g/mol ≈ 5.34 mol
Since the mole fraction of oxygen in dry air is given as 0.21, we can calculate the total moles of dry air needed to produce 5.34 mol of oxygen:
Moles of dry air = moles of oxygen / mole fraction of oxygen = 5.34 mol / 0.21 ≈ 25.43 mol
Now, we can use the ideal gas law to calculate the volume of dry air at 25°C and 750 torr (convert to atm) that corresponds to 25.43 mol:
PV = nRT
P = 750 torr * (1 atm / 760 torr) ≈ 0.987 atm
V = volume of dry air (unknown)
n = 25.43 mol
R = 0.0821 L·atm/(mol·K)
T = 25°C + 273.15 = 298.15 K
Solving for V:
V = nRT / P = (25.43 mol)(0.0821 L·atm/(mol·K))(298.15 K) / 0.987 atm ≈ 631.5 L
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Which option is formed by the process of fusion in stars?
O compounds
Oelectrons
O quarks
Oelements
Answers
D. The option that is formed by the process of fusion in stars is elements.
How fusion in stars form elements
When the new star reaches a certain size, a process called nuclear fusion ignites, generating the star's vast energy.
The fusion process forces hydrogen atoms together, transforming them into heavier elements such as;
helium, carbon and oxygen.Thus, the option that is formed by the process of fusion in stars is elements.
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The graph shows five data points collected in an investigation of the relationship between the concentration of alcohol dissolved in water and its density. The relationship was expected to be linear. Which of the data points most likely resulted from an error in procedure? a 1 b 2 c 4 d 5
Answers
In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.
Thus, Although they require very large sample sizes, hydrometers are rather simple to operate. Usually, 300 to 500 ml per measurement are required. Hydrometers frequently require calibration off-site as well.
With measurements taken by eye, user error is a major issue, and temperature management is especially challenging. Inaccurately bringing and maintaining samples at temperature might take a long time, and once more, user perception of temperature levels is used to determine temperature levels.
Pycnometers and hydrometers have a further problem in that the findings of alcohol measurement are challenging to evaluate and record.
Thus, In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.
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Balance the following skeleton reaction and identify the oxidizing and reducing agents:
CrO42- (aq) + N2O(g)+ H+(aq) + OH-(aq) + H2O(l) ⟶ Cr3+(aq) + NO(g) + H+(aq) + OH-(aq) + H2O(l)
oxidizing agent is (enter just the formula of the species, e.g. CrO42-,N2O, Cr3+,NO, H2O, H+, OH-)
reducing agent is (enter just the formula of the species, e.g. CrO42-,N2O, Cr3+,NO, H2O, H+, OH-)
Answers
Answer:
The balanced net ionic equation is as follows:
CrO₄²- (aq) + 3 N₂O (g) + 2 H+ (aq) ----> Cr³+ (aq) + 6 NO (g) + H₂O (l)
The oxidizing agent is CrO₄²- as Cr⁶+ in CrO₄²- is reduced to Cr³+.
The reducing agent is N₂O as the nitrogen (i) is oxidized to nitrogen (ii).
Explanation:
The skeleton equation is given as follows:
CrO₄²- (aq) + N₂O(g)+ H+(aq) + OH-(aq) + H2O(l) ----> Cr³+(aq) + NO(g) + H+(aq) + OH-(aq) + H₂O(l)
The balanced net ionic equation with the spectator ions removed is as follows:
CrO₄²- (aq) + 3 N₂O (g) + 2 H+ (aq) ----> Cr³+ (aq) + 6 NO (g) + H₂O (l)
In a redox reaction, oxidizing agents are reduced while reducing agents are oxidized.
The oxidizing agent is CrO₄²- as Cr⁶+ in CrO₄²- is reduced to Cr³+.
One mole of CrO₄²- accepts three moles of electrons from three moles of N₂O to become reduced to 1 mole of Cr³+.
The reducing agent is N₂O as the nitrogen (i) is oxidized to nitrogen (ii).
Three moles of N₂O will each donate one mole of electrons to one mole of CrO₄²- to become oxidized to nitrogen (ii) oxide.
Hydrogen ions and a water molecule is added to the left-hand side and right-hand side of the equation respectively, in order to balance the number of oxygen atoms in the equation of the reaction.
At what temperature is a gas if 0.0851 moles of it is contained in a 604 mLvessel at 100.4 kPa?
Answers
Assuming the gas in question behaves as an ideal gas, we can use the Ideal Gas Law:
\(PV=nRT\)Where P is the pressure, V is the volume, n is the number of moles, R is the Ideal Gas Constant and T is the absolute temperature.
We have to match the units from R and the other variables.
The pressure is in kPa, so we can look for a R value that is also in kPa.
One such value is:
\(R\approx8.31446\frac{L\cdot kPa}{K\cdot mol}\)But the volume unit is in L, so we need to convert the volume we have:
\(V=604mL=0.604L\)Now, we have:
\(\begin{gathered} P=100.4kPa \\ V=0.604L \\ n=0.0851mol \\ R\approx8.31446\frac{L\cdot kPa}{K\cdot mol} \end{gathered}\)Solving the equation for T and substituting the values, we have:
\(\begin{gathered} PV=nRT \\ T=\frac{PV}{nR} \\ T=\frac{100.4\cdot kPa\cdot0.604\cdot L}{8.31446\cdot L\cdot kPa\cdot K^{-1}\cdot mol^{-1}\cdot0.0851mol} \\ T=\frac{100.4\cdot0.604}{8.31446^{}^{}\cdot0.0851}K \\ T=\frac{60.6416}{0.707560\ldots}K \\ T=85.70517\ldots K \\ T\approx85.7K \end{gathered}\)So, the temperature is approximately 85.7 K.
please write the balanced equation for the following reaction:
AI3O3 (s) + C (s) + CI2 (g) = AICI3 (s) + CO (g)
Answers
The balanced equation for the reaction is as follows:
3 AI2O3 (s) + 3C (s) + 2CI2 (g) → 3AICI3 (s) + 3CO (g)
Combination reactions happen when two or more reactants come together to create a single product. In this instance, the reactants are chlorine gas, carbon, and aluminium oxide (AI2O3) (CI2). Aluminum chloride (AICI3) and carbon monoxide make up the final product (CO). Exothermic means that energy is released when the reactants come together in this reaction. Both heat and light are manifestations of this energy. The bonds between the atoms in the reactants are broken and new bonds between the atoms in the product are formed when the reactants combine. The reaction is exothermic because of the energy released during this process.
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Think about how you could design a robot to propel itself across an ice rink by applying the same principles that cause rockets to move. Describe what materials you would use and how the robot would work. What are some material limitations that you would need to consider for a robot moving on ice?
please help
Answers
Answer:
To design a robot that propels itself across an ice rink using the same principles as rockets, I would start by considering the materials that would be suitable for use on ice. Some materials that might work well for this purpose include plastic, rubber, and certain types of metal, such as aluminum or stainless steel.
Explanation:
The robot would work by using a propulsion system to generate a force that propels it forward. This could be achieved using a variety of methods, such as by using a jet engine or a rocket engine to produce a stream of hot gases that exits through a nozzle, creating a thrust force in the opposite direction.One material limitation to consider when designing a robot that moves on ice is the coefficient of friction between the robot's surface and the ice. A material with a low coefficient of friction, such as rubber or plastic, would be better suited for movement on ice, as it would provide less resistance and allow the robot to move more easily. In contrast, a material with a high coefficient of friction, such as steel, would be more difficult to move on ice, as it would generate more resistance and require more force to overcome.Other material limitations to consider when designing a robot for movement on ice might include the robot's weight and shape, as well as the overall stability and balance of the robot. It would also be important to consider the durability and wear resistance of the materials used, as the robot may need to withstand repeated movement on the ice over time.Answer:
Explanation:
Students learn about humankind’s search for life in outer space and how it connects to robotics and engineering. NASA is interested in sending exploratory missions to one of Jupiter’s moons, Europa, which requires a lot of preparatory research and development on Earth before it can happen. One robot currently being engineered as a proof of concept for a possible trip to explore Europa is the Icefin, which is an innovative robot that can explore under ice and in water, which are the believed conditions on Europa. This lesson provides students with intriguing information about far off (distance and time!) space missions and field robotics, and also sets up two associated robotics and arts integration activities to follow. The lesson can be used individually to provide new information to students, or as a precursor to the associated activities. A PowerPoint® presentation and worksheet are provided
what is the concentration of a nitric acid solution if 10.0 ml of the solution is neutralized by 3.6 ml of 0.2 m naoh?
Answers
Answer:
The concentration of the nitric acid (HNO3) solution is 72 M.
Explanation:
To determine the concentration of the nitric acid solution, we can use the concept of stoichiometry and the equation of the neutralization reaction between nitric acid (HNO3) and sodium hydroxide (NaOH):
HNO3 + NaOH → NaNO3 + H2O
The balanced equation shows that the molar ratio between HNO3 and NaOH is 1:1. This means that 1 mole of HNO3 reacts with 1 mole of NaOH.
Given:
Volume of HNO3 solution = 10.0 ml
Volume of NaOH solution = 3.6 ml
Molarity of NaOH solution = 0.2 M
To find the concentration of the HNO3 solution, we need to calculate the number of moles of NaOH used in the neutralization reaction:
moles of NaOH = volume of NaOH solution * molarity of NaOH solution
= 3.6 ml * 0.2 M
= 0.72 mmol (millimoles)
Since the molar ratio between HNO3 and NaOH is 1:1, the number of moles of HNO3 in the solution is also 0.72 mmol.
Now, we can calculate the concentration of the HNO3 solution using the formula:
concentration (in M) = moles of solute / volume of solution (in L)
concentration = 0.72 mmol / 0.010 L
= 72 mmol/L
= 72 M
Therefore, the concentration of the nitric acid (HNO3) solution is 72 M.
Suppose you heat a metal object with a mass of 34.5 g to 95.5 °C and transfer it to a calorimeter containing 100.0 g of water at 17.5 °C. The water and metal reach a final temperature of 24.9 °C.
Metal in a covered cup with a thermometer and heat indicated as leaving the metal.
What is the specific heat of the metal in J/g⋅∘C
Answers
q = m × c × ΔT
where q is the heat transferred, m is the mass of the metal, c is the specific heat of the metal, and ΔT is the change in temperature.
First, we need to calculate the heat transferred from the metal to the water:
q = m × c × ΔT
q = (34.5 g) × c × (95.5 °C - 24.9 °C)
q = 224,085 J
Next, we can calculate the heat absorbed by the water:
q = m × c × ΔT
q = (100.0 g) × (4.184 J/g⋅∘C) × (24.9 °C - 17.5 °C)
q = 3,073 J
Since the heat transferred from the metal to the water is equal to the heat absorbed by the water, we can set the two equations equal to each other and solve for c:
m × c × ΔT = m × c × ΔT
(34.5 g) × c × (95.5 °C - 24.9 °C) = (100.0 g) × (4.184 J/g⋅∘C) × (24.9 °C - 17.5 °C)
c = 0.385 J/g⋅∘C
Therefore, the specific heat of the metal is 0.385 J/g⋅∘C.
Humans have 50 pairs of chromosomes true or false
Answers
Answer:
False
Explanation:
humans have 23 pairs
Which of the following actions does the Commissioner of Insurance NOT have the power to conduct? O Activate insurance companies' financial reserves O Issue a cease-and-desist order Issue insurance licenses O Regulate the business of insurance in this state
Answers
The insurance commissioner does not have the right to activate insurance companies' financial reserves.
Functions of the commisioner for insuranceThe insurance commisioner is soely in charge of the control of the bussiness of insurance in the company and seeks to ensure that prudent insurance policies are implemented by the government.
However, the insurance commissioner does not have the right to activate insurance companies' financial reserves.
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Write the formula for the ionic compounds that would form between the following ions: A. aluminum and oxygen B. calcium and sulfate C. magnesium and bromine
Answers
(A) \(2Al(s) + 3O2(g) -- > Al2O3(s)\), (B) \(Ca + SO4 -- > CaSO4\),
(C) \(2Mg + Br2 -- > 2MgBr2\) are reactions that occur that would form \(Al2O3\), \(CaSO4\), and \(MgBr2\) as resultant ionic compounds.
Al2O3 is obtained as the empirical formula if we combine two Al3+ ions and three O2- ions, using subscripts to show the number of each ion in the formula. An ionic compound is aluminum oxide. It has two aluminum atoms for every three oxygen atoms, according to this definition. It is a result of the reaction between oxygen and aluminum. Calcium ion and sulphate ion combine to generate the chemical known as calcium sulphate. Sulfate and calcium ions each have two positive charges (Ca2+) and two negative charges (SO42), and they combine to create the neutral molecule CaSO4. Bromine and magnesium are combined to form magnesium bromide. Magnesium bromide has the chemical formula MgBr2.
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Researchers investigated the influence of environmental pH on the activity of peroxidase, an enzyme that catalyzes the conversion of hydrogen peroxide to water and oxygen gas. In an experiment, the researchers added a hydrogen peroxide solution containing guaiacol to several identical test tubes and adjusted the solution in each test tube to a different pH. The researchers included the guaiacol because it caused the solutions to change color as the reactions proceeded, which the researchers relied on for measuring reaction rates. Finally, the researchers added the same amount of peroxidase to each test tube and measured the rate of each reaction at 23°C. The results of the experiment are represented in Figure 1. One of the researchers proposes using oxygen gas production to measure reaction rates. Which of the following statements best justifies the use of the proposed modification as a way of creating an appropriate control for the investigation?
O the experiment can be repeated without hydrogen peroxide, which will help eliminate an uncontrolled variable. O the experiment can be repeated without hydrogen peroxide, which will help eliminate an uncontrolled variable. O the experiment can be repeated without peroxidase, which will introduce a second independent variable. O the experiment can be repeated without peroxidase, which will introduce a second independent variable. O the experiment can be repeated without guaiacol, which will reveal the effect of guaiacol on the reaction rates. O the experiment can be repeated without guaiacol, which will reveal the effect of guaiacol on the reaction rates. O the experiment can be repeated without water, which will reveal whether the reaction can occur inside a living cell.
Answers
In studying the influence of environmental pH on peroxidase activity, researchers can repeat the experiment without guaiacol, which will reveal the effect of guaiacol on reaction rates.
The proposal to use the production of gaseous oxygenOne of the investigators' proposal to use oxygen gas production to measure reaction rates leads to a change in the dependent variable.
In the first experiment the dependent variable was the volume of guaiacol and in the second experiment the dependent variable will be oxygen production.
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How many liters of hydrogen gas can form at STP when 0.500 L of 2.00M HCl solution reacts with excess magnesium?
The answer is 11.2 L but can someone show the process
Answers
Taking into account the reaction stoichiometry, 11.2 liters of hydrogen gas can form at STP when 0.500 L of 2.00M HCl solution reacts with excess magnesium.
Reaction stoichiometryIn first place, the balanced reaction is:
Mg + 2 HCl → H₂ + MgCl₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Mg: 1 moleHCl: 2 molesH₂: 1 moleMgCl₂: 1 moleDefinition of molarityMolarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.
STP conditionsThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Liters of H₂ formedFirst of all, you know that react 0.500 L of 2.00M HCl. Taking into account the definition of molarity. It is possible to calculate the number of moles that react as follows:
moles of HCl= 0.500 L× 2 M
moles of HCl= 1 mole
To calculate the number of moles H₂ formed, the following rule of three can be applied: if by reaction stoichiometry 2 moles of HCl form 1 mole of H₂, 1 mole of HCl form how many moles of H₂?
moles of H₂= (1 mole of HCl× 1 mole of H₂)÷ 2 moles of HCl
moles of H₂= 0.5 moles
Finally, to calculate the liters of H₂ formed, you can apply the following rule of three: if by definition of STP conditions 1 mole of H₂ occupies a volume of 22.4 liters, 0.5 moles occupies how much volume?
volume= (0.5 moles× 22.4 L)÷ 1 mole
volume= 11.2 L
In summary, 11.2 liters of hydrogen gas can be formed at STP.
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N2O4(g) + 4H2(g) → N2(g) + 4H2O(g), solve using standard enthalpies of formation
Answers
The standard enthalpy of formation (Δ\(H_f\)) is a measure of the energy released or consumed when one mole of a substance is created under standard conditions from its pure elements.
Standard enthalpies (Δ\(H_f\)) of formation for given reaction is 978.3 kJ
What is Standard enthalpies of formation?The standard enthalpy of formation is defined as the enthalpy change when one mole of a substance in the standard state (1 atm of pressure and 298.15 K) is formed from its pure elements under the same conditions.
Given reaction ;
\(N_2O_4(g) + 4H_2 (g) - > N_2(g) + 4H_2O(g)\)
To Find : Δ\(H_f\)
Δ\(H_f\) = ∑np Δ\(H_f\) (products) – ∑np Δ\(H_f\) (reactants)
Δ\(H_f\) = [1(Δ\(H_f\) \(N_2\)) + 4(Δ\(H_f\) \(H_2O\))] – [1(Δ\(H_f\) \(N_2O_4\)) + 4(Δ\(H_f\) \(H_2\))]
Δ\(H_f\) = [1(0) + 4(-241.8)] – [1(+9.16) + 4(0)]
Δ\(H_f\) = [4(-241.8)] – [1(+9.16)] = 978.3 kJ
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Which type of energy would running be?
Thermal
Light (solar)
Kinetic
Potential
Answers
Answer:
so here is the answer
Explanation:
Kinetic is the answer.
Express the number in
standard notation or
standard form.
1.25 x 10²
Standard Form
Answers
Answer:
125
Explanation:
the positive 2 on the exponent means you have to move the decimal point 2 times to the right, giving you 125.
you can also simplify the expression to 1.25 * 100 and get 125
2 Al(s) + Fe2O3(aq) - AlO3(aq) + 2 Fe(s)
You react 20.00 grams of aluminum with iron(III) oxide. How many grams of iron should you produce?
What is the percent yield if the experimental yield is 32.67 grams of iron?
Answers
Answer:
78.8%
Explanation:
The equation of the reaction is;
2 Al(s) + Fe2O3(aq) ------> Al2O3(aq) + 2Fe(s)
Number of moles in 20g of Al= 20g/27 g/mol = 0.74 moles
From the reaction equation;
2 moles of Al yields 2 moles of Fe
0.74 moles of Al yields 0.74 moles of Fe
Hence;
Mass of Fe produced = 0.74 moles of Fe * 56 g/mol
Mass of Fe produced = 41.44 g of Fe (This is the theoretical yield of Fe)
percent yield = actual yield/ theoretical yield * 100
actual yield = 32.67 grams of iron
percent yield = 32.67 g/41.44 g * 100
percent yield = 78.8%
Choose one or more:
A. Electrons exhibit interference or diffraction due to scattering objects or apertures around the same size as their de Broglie wavelength.
B. Electrons don't collapse into the nucleus because they form standing waves of discrete modes of vibration.
C. Electrons exhibit a discrete charge.
D. Electrons may tunnel through barriers of nanometer or below thickness.
E. Electrons exhibit a discrete mass.
Answers
Answer:Electrons exhibit interference or diffraction due to scattering objects or apertures around the same size as their de Broglie wavelength. Electrons exhibit a discrete charge. Electrons exhibit a discrete mass. Electrons may tunnel through barriers of nanometer or below thickness
Explanation:
Electrons behave both as matter an waves in accordance with De Broglie principle of wave particle duality hence they possess an associated wavelength and as such undergo diffraction and interference.
Electrons have a known magnitude of mass and charge.
Many studies have also shown that electrons can tunnel through barriers of 1nm thickness or less.
For the following questions, assume that all four
graphs have the same vertical scale.
Which graph shows an endothermic reaction?
graph 1
graph 2
graph 3
graph 4
Answers
Graph 1 represents an endothermic reaction as the energy of products is greater than that of reactants.
What is an endothermic reaction?An endothermic reaction is defined as a chemical reaction which is a thermodynamic process accompanied by an increase in enthalpy of the system.In this process, a system absorbs energy from the surroundings which is mainly thermal energy.
Thus an endothermic reaction leads to an increase in the temperature of the system with a decrease in the temperature of the surroundings.Endothermic reactions usually involve the formation of bonds which requires input of energy.In endothermic reactions, entropy of the surrounding decreases.
Many endothermic processes involve the physical changes rather the chemical changes.In an endothermic reaction ,the potential energy of products is greater than that of reactants.
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What is the pH of a solution with a H+ ion of 2×10-¹²?
Answers
Answer:
11.7
Explanation:
The pH is the negative logarithm of the concentration of H+ ions. If the concentration is 2×10-¹² the the pH will be -log(2×10-¹²) which is 11.698 which can be round up to 11.7.
The label shown above contains information about some harmful effects of acetone.A group of students plans to use acetone to rinse out a glass container. A second group of students is working at the same lab table. Which of the following lab procedures should the second group of students avoid?
Answers
Answer:
Heating water with an open flame
Explanation:
Remember, we are told in the label that Acetone is a "flammable liquid and vapor." Being flammable means the substance can easily be set on fire, and we would expect an open flame from heating water to trigger an explosion (a disaster) in which the Acetone is set on fire causing life-threatening dangers to the second group of students.
What is the numbers of molecules for 65.8g of CO2?
Answers
Answer:
One gram of carbon dioxide contains 13.6 x 10²¹ number of molecules.
Explanation:
Answer:
1.50 moles
Explanation:
use dinemential analysis
find the molar mass
Question 4 (1 point)
If the decomposition of (NH4)2(CO3) is a first-order process with a rate constant of
0.196 s-1, how much ammonium carbonate would remain after 39.0 s, starting from
a concentration of 0.957 M?
Your Answer in units:
Answers
The final concentration of the reactant of a first order reaction can be determined from the rate constant equation. The concentration of ammonium carbonate after 39 s will be 0.003 M.
What is rate constant?Rate constant of a reaction is the rate of reaction when one molar concentration of the reactant is involved in the reaction. The expression for the rate constant k for first order reaction is :
k = 1/t ln (C0/Ct)
Where C0 be the initial concentration and Ct be the concentration after t seconds.
Given that C0 of ammonium nitrate = 0.957 M
rate constant = 0.196 /s
t = 39 s.
The concentration after 39 seconds is calculated as follows:
0.196 /s = 1/39s ln (0.957 M / Ct)
Ct = 0.957 / (ln⁻¹ (0.196 × 39))
= 0.003 M.
Therefore, the concentration of ammonium carbonate after 39 seconds will be 0.003 M.
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Water is homogeneous substance true or false
Answers
Answer: pure water is homogeneous and pure substance.
Explanation: However, when a homogeneous substance consists of two or more different types of molecules uniformly intermingled with one another, then it’s called a homogeneous mixture. A mixture’s composition can vary, but a pure substance does not.
Answer:
True
Explanation:
since the gases and minerals dissolved in water are in the same state as water and they do not form separate layers
If the pH of a solution is changed from 6 to 4, how much stronger will the acid strength be?
Answers
Answer:
very strong
Explanation:
acid rain ph = 4.3 to 4.5 .
that much strong
what subshell has quantum numbers n =2 and l = 2?
Answers
The subshell with quantum numbers n=2 and l=2 is the 2D subshell.
What is quantum number?The set of numbers used to describe the position and energy of the electron in an atom are called quantum numbers.
There are four known quantum numbers, and they include:
principal, azimuthal, magnetic and spin quantum numbers.The principal quantum number (n) indicates the energy level or shell of an electron, while the azimuthal quantum number (l) indicates the shape of the electron cloud or subshell.
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a. Identify the structures shown in the diagram. b. Identify the information that is contained within these structures. c. Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person. d. Explain why the structures are in pairs.
Answers
The answer responses to the structures shown in the diagram are:
A. chromosomes
C. They would be the same.
B. They are in pairs because each one comes from a different parent.
What is the structure about?The chromosomes are in pairs because humans have a diploid number of chromosomes, meaning they have two sets of chromosomes, one inherited from each parent.
The nucleus is important in eukaryotic cells and has many important parts that help the cell work properly. There are some parts inside cells called the nuclear membrane, nucleoplasm, nucleolus, and chromatin. Chromatin is made up of DNA and other proteins.
Every part of a person's body has the same genes, but the way they are organized can be different in different types of cells. The chromosomes in our skin cells might not be the same as the chromosomes in our muscle cells, even if they come from the same person.
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Identify the structures shown.
A. chromosomes
B. mitochondria
C. nuclei
D. vacuoles
C
Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.
A. There would be longer.
B. They would be shorter.
C. They would be the same.
D. They would be different.
Describe how the structures from this cell would compare to the structures in the nucleus of another body cell from the same person.
A. There would be longer.
B. They would be shorter.
C. They would be the same.
D. They would be different.
Explain why the structures are in pairs.
A. They aren't in pairs.
B. They are in pairs because each one comes from a different parent.
C. This cell is making a copy of itself.
D. The cell always has 2 copies in case 1 is damaged.