1.Liquids only exert pressure downward.
True
False
2.As the depth of a liquid increases, so does the pressure.
True
False
3.Pascal's principle states that:
all liquids exert pressure downward.
pressure will move toward areas where pressure is lowest.
applied pressure will be transmitted throughout a fluid.
None of the choices are correct.
4.Liquid pressure depends upon the shape of the container in which it is held.
True
False
5.Archimedes' principle involves:
density.
displacement.
buoyancy.
All of the choices are correct.
6.The temperature at which water boils can be related to the weather.
True
False
7.Water pressure is measured with a barometer.
True
False
Answers
1. Liquids and gases exert pressure in all directions. Hence, the statement is false.
2. As the depth of liquid increases, so does the pressure. Hence, the statement is true.
3. Pascal's principle states that applied pressure will be transmitted throughout a fluid. Hence, statement C is true.
4. The pressure in a fluid depends only on the depth from the surface and not on the shape of the container. Hence, the statement is false.
5. Archimedes' principle involves buoyancy. Hence, statement C is true.
6. The temperature at which water boils can't be related to the weather. Hence, the statement is false.
7. A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure. Hence, the statement is false.
What is a barometer?A barometer is an instrument used to measure air pressure.
1. Since a fluid has no definite shape, its pressure applies in all directions. Liquids and gases exert pressure in all directions. Hence, the B is true.
2. Pressure increases as the depth increase. The pressure in a liquid is due to the weight of the column of water above. Since the particles in a liquid are tightly packed, this pressure acts in all directions.
3. Pascal's law says that pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions.
4. The pressure in a fluid depends only on the depth from the surface and not on the shape of the container.
5. Archimedes' principle states that a body immersed in a fluid is subjected to an upwards force equal to the weight of the displaced fluid.
6. Boiling occurs when the vapour pressure reaches or exceeds the surrounding pressure from the atmosphere or whatever else is in contact with the liquid. At standard atmospheric pressure (1 atmosphere = 0.101325 MPa), water boils at approximately 100 degrees Celsius.
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Related Questions
for the reaction 2a b ⇌ 2c 3d, the equilibrium expression is: keq = [a]2[b][c]2[d]3 keq = [2][1][2][3] keq = [2c][3d][2a][b] keq = [c]2[d]3[a]2[b] none of the above
Answers
Keq = [C]2[D]3 / [A]2[B]
Therefore, the correct answer is: keq = [c]2[d]3[a]2[b]
enter a balanced compleenter a balanced complete ionic equation for na3po4(aq) fecl2(aq)→fe3(po4)2(s) nacl(aq)te ionic equation for lioh(aq) hno3(aq)→h2o(l) lino3(aq)
Answers
The balanced chemical equation for Na₃PO₄ and FeCl₂:
2 Na₃PO₄ (aq) + 3 FeCl₂ (aq) → Fe₃(PO₄)₂ (s) + 6NaCl (aq)
The net ionic equation of HNO₃ and LiOH:
H⁺(aq) + OH⁻(aq) → H₂O (l)
What are the net ionic equations?The net ionic equation is an equation of a chemical reaction that expresses only elements, ions, or compounds, that directly participated in that chemical reaction.
We can write a balanced chemical equation for Na₃PO₄ and FeCl₂:
2 Na₃PO₄ (aq) + 3 FeCl₂ (aq) → Fe₃(PO₄)₂ (s) + 6NaCl (aq)
The complete ionic equation can be written for reaction of Na₃PO₄ and FeCl₂:
6Na⁺ (aq) + 2PO₄³⁻ (aq) + 3 Fe³⁺ (aq) + 6Cl⁻ (aq) → Fe₃(PO₄)₂ (s) + 6 Na⁺ (aq) + 6Cl⁻ (aq)
The balanced chemical equation for HNO₃ and LiOH:
HNO₃ (aq) + LiOH (aq) → H₂O (l) + LiNO₃ (aq)
The complete ionic equation for HNO₃ and LiOH::
H⁺(aq) + NO₃⁻ (aq) + Li⁺(aq) + OH⁻ (aq) → H₂O (l) + Li⁺(aq) + NO₃⁻ (aq)
The net ionic equation of HNO₃ and LiOH:
H⁺(aq) + OH⁻(aq) → H₂O (l)
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Hydrogen atoms do not repel each other within a star
Answers
largest electronegativity element
Answers
Answer:
Fluorine (F)
Explanation:
As you move to the right across the periodic table, the electronegativity increases. As you move up a group, the electronegativity increases.
This means that the most electronegative element is fluorine.
Do you have more human cells or
bacteria cells in your body?
Answers
Which fraction contains the largest molecules?
A) diesel
B)gasoline
C)kerosene?
Answers
If a solution containing 30.91 g of mercury(II) chlorate is allowed to react completely with a solution containing 9.718 g of sodium dichromate, how many grams of solid precipitate will form? How many grams of the reactant in excess will remain after the reaction?
Answers
The balanced chemical equation for the reaction between mercury(II) chlorate and sodium dichromate is:3Hg(ClO3)2 + Na2Cr2O7 → 3HgCrO4 + NaClO3 + NaClFirst, we can calculate the amount of solid precipitate formed using stoichiometry.
The molar mass of Hg(ClO3)2 is 386.61 g/mol.The molar mass of Na2Cr2O7 is 297.80 g/mol.Therefore, the number of moles of Hg(ClO3)2 is:30.91 g ÷ 386.61 g/mol = 0.08 molAnd the number of moles of Na2Cr2O7 is:9.718 g ÷ 297.80 g/mol = 0.03 mol
Using the stoichiometric coefficients, we can see that 3 moles of Hg(ClO3)2 react with 1 mole of Na2Cr2O7 to form 3 moles of HgCrO4.
Therefore, the limiting reactant is Na2Cr2O7 because it forms fewer moles of the product. The amount of Hg(ClO3)2 used is 1/3 of the amount of Na2Cr2O7 used.So, 0.03 mol of Na2Cr2O7 would require 3 × 0.03 mol = 0.09 mol of Hg(ClO3)2 to react completely.
Since only 0.08 mol of Hg(ClO3)2 is available, it is the limiting reactant.So, all of the 0.03 mol of Na2Cr2O7 reacts to form 0.03 × 3 mol = 0.09 mol of HgCrO4.The molar mass of HgCrO4 is 396.66 g/mol.Therefore, the mass of HgCrO4 formed is:0.09 mol × 396.66 g/mol = 35.70 gSo, 35.70 g of solid precipitate will form.
Now, we can calculate the amount of reactant in excess. 0.08 mol of Hg(ClO3)2 reacted with all of the Na2Cr2O7. So, the amount of Hg(ClO3)2 in excess is:0.08 mol - 0 mol = 0.08 molThe mass of Hg(ClO3)2 in excess is:0.08 mol × 386.61 g/mol = 30.93 gTherefore, 30.93 grams of the reactant in excess will remain after the reaction.
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The reaction between 30.91 grams of mercury(II) chlorate and 9.718 grams of sodium dichromate will produce 30.35 grams of solid precipitate (Hg2Cl2) and leave 2.86 grams of sodium dichromate in excess.
To determine the grams of solid precipitate formed and the grams of the reactant in excess, we first need to write the balanced equation for the reaction between mercury(II) chlorate (Hg(ClO3)2) and sodium dichromate (Na2Cr2O7). The balanced equation is as follows:
3 Hg(ClO3)2 + Cr2O7^2- + 14 Na+ → 3 Hg2Cl2 + 2 Cr3+ + 7 NaClO3
According to the balanced equation, 3 moles of mercury(II) chlorate react with 1 mole of sodium dichromate to produce 3 moles of solid mercury(I) chloride (Hg2Cl2).
Calculating the grams of solid precipitate formed (Hg2Cl2):
To determine the grams of solid precipitate formed, we need to calculate the number of moles of mercury(II) chlorate and sodium dichromate, and then use the stoichiometry of the balanced equation to find the number of moles of solid precipitate.
Finally, we can convert the moles to grams using the molar mass of Hg2Cl2.
Molar mass of Hg2Cl2 = 2 * (atomic mass of Hg) + atomic mass of Cl
Molar mass of Hg2Cl2 = 2 * (200.59 g/mol) + 35.45 g/mol
Molar mass of Hg2Cl2 = 436.63 g/mol
Number of moles of Hg(ClO3)2 = mass / molar mass
Number of moles of Hg(ClO3)2 = 30.91 g / (2 * (200.59 g/mol) + 3 * 16.00 g/mol + 2 * 35.45 g/mol)
Number of moles of Hg(ClO3)2 = 30.91 g / 444.22 g/mol
Number of moles of Hg(ClO3)2 = 0.0696 mol
Number of moles of Na2Cr2O7 = mass / molar mass
Number of moles of Na2Cr2O7 = 9.718 g / (2 * 22.99 g/mol + 2 * 52.00 g/mol + 7 * 16.00 g/mol)
Number of moles of Na2Cr2O7 = 9.718 g / 294.95 g/mol
Number of moles of Na2Cr2O7 = 0.0329 mol
From the balanced equation, we can see that the mole ratio of Hg(ClO3)2 to Hg2Cl2 is 3:3. Therefore, the number of moles of Hg2Cl2 formed will be equal to the number of moles of Hg(ClO3)2.
Number of moles of Hg2Cl2 formed = 0.0696 mol
Mass of Hg2Cl2 formed = number of moles * molar mass
Mass of Hg2Cl2 formed = 0.0696 mol * 436.63 g/mol
Mass of Hg2Cl2 formed = 30.35 g
Therefore, 30.35 grams of solid precipitate (Hg2Cl2) will form.
Calculating the grams of the reactant in excess (Na2Cr2O7):
To determine the grams of the reactant in excess, we need to compare the stoichiometry of the balanced equation to see which reactant is left over.
Since the mole ratio of Hg(ClO3)2 to Na2Cr2O7 is 3:1, we can calculate the number of moles of Hg(ClO3)2 that react with the available amount of Na2Cr2O7, and then subtract that from the initial moles of Na2Cr2O7 to find the remaining moles.
Finally, we can convert the remaining moles to grams using the molar mass of Na2Cr2O7
Number of moles of Na2Cr2O7 reacted = (number of moles of Hg(ClO3)2) / 3
Number of moles of Na2Cr2O7 reacted = 0.0696 mol / 3
Number of moles of Na2Cr2O7 reacted = 0.0232 mol
Number of moles of Na2Cr2O7 remaining = (initial moles of Na2Cr2O7) - (moles of Na2Cr2O7 reacted)
Number of moles of Na2Cr2O7 remainin = 0.0329 mol - 0.0232 mol
Number of moles of Na2Cr2O7 remaining = 0.0097 mol
Mass of Na2Cr2O7 remaining = number of moles * molar mass
Mass of Na2Cr2O7 remaining = 0.0097 mol * (2 * 22.99 g/mol + 2 * 52.00 g/mol + 7 * 16.00 g/mol)
Mass of Na2Cr2O7 remaining = 0.0097 mol * 294.95 g/mol
Mass of Na2Cr2O7 remaining = 2.86 g
Therefore, 2.86 grams of sodium dichromate (Na2Cr2O7) will remain after the reaction.
The reaction between 30.91 grams of mercury(II) chlorate and 9.718 grams of sodium dichromate will produce 30.35 grams of solid precipitate (Hg2Cl2) and leave 2.86 grams of sodium dichromate in excess.
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how might mass spec be able to help determine the differences between these three molecules that have very similar molecular weights?
Answers
Mass spectrometers may be used to pick out unknown compounds through molecular weight determination, to quantify regarded compounds, and to decide shape and chemical residences of molecules.
The relative abundance of every isotope may be decided the usage of mass spectrometry. A mass spectrometer ionizes atoms and molecules with a high-power electron beam after which deflects the ions via a magnetic discipline primarily based totally on their mass-to-charge ratios ( m / z m/z m/z ). In a pure sample of an element, the mass of that element is represented as an m/z ratio and can be used to identify the element. Also, identification of an element can be done by calculating the average atomic mass from the mass spectrum data.
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at the atomic level what causes fudge topping to pour faster when it is heated
Answers
At the atomic level, the main factor that causes fudge topping to pour faster when heated is the increase in the average kinetic energy of its constituent particles.
When fudge topping is heated, the thermal energy is transferred to the molecules and atoms within the topping. As the temperature rises, the average kinetic energy of the particles increases. This increase in kinetic energy leads to greater molecular motion and faster molecular interactions within the fudge topping.
The increase in molecular motion and interactions results in a reduction in the viscosity of the fudge topping. Viscosity refers to the resistance of a substance to flow. As the temperature increases and the particles move more rapidly, the intermolecular forces holding the fudge topping together weaken, allowing it to flow more easily.
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How many moles are in sample containing 2.71 x 10^24 atoms of iron?
Answers
Answer:
4.5 moles
Explanation:
One mole is equal to 6.022 x 10^23 atoms
2.71 x 10^24 atoms * 1 mol/ 6.022 x 10^23 atoms = 4.5 moles
A sample containing 27. 0 moles of propane gas at a temperature of 25. 0 °C is stored in a 12. 5 liter cylinder. What is the pressure of the gas inside the cylinder?
Answers
The pressure of the gas inside the cylinder is 52.90 atm
Given is the number of moles of gas, the temperature and the volume of the gas and we need to find the pressure of the gas inside the cylinder, for this we can use the ideal gas law equation:
PV = nRT
Where:
P = Pressure of the gas (in units of pressure, such as atm)
V = Volume of the gas (in liters)
n = Number of moles of the gas
R = Ideal gas constant (0.0821 L·atm/(mol·K))
T = Temperature of the gas (in Kelvin)
First, let's convert the temperature from Celsius to Kelvin:
T = 25.0 °C + 273.15 = 298.15 K
Now we can substitute the values into the ideal gas law equation:
P × 12.5 L = 27.0 moles × 0.0821 L·atm/(mol·K) × 298.15 K
Simplifying the equation:
P × 12.5 L = 661.2587 L·atm
Dividing both sides by 12.5 L:
P = 661.2587 L·atm / 12.5 L
P ≈ 52.90 atm
Therefore, the pressure of the gas inside the cylinder is approximately 52.90 atm.
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We can use the ideal gas law equation to determine the pressure of a gas within a cylinder:
PV = nRT
Where:
P is the pressure of the gas (in units of pressure, such as atm)
V is the volume of the gas (in units of volume, such as liters)
n is the number of moles of the gas
R is the ideal gas constant (0.0821 L·atm/(mol·K))
T is the temperature of the gas (in units of temperature, such as Kelvin)
we need to convert the temperature from Celsius to Kelvin:
T(K) = T(°C) + 273.15
T(K) = 25.0 °C + 273.15
T(K) = 298.15 K
Now we can plug the data into the ideal gas law equation as follows:
P * 12.5 L = 27.0 moles * 0.0821 L·atm/(mol·K) * 298.15 K
Simplifying the equation:
P = (27.0 moles * 0.0821 L·atm/(mol·K) * 298.15 K) / 12.5 L
Calculating the pressure:
P ≈ 5.046 atm
As a result, the gas inside the cylinder is under a pressure of about 5.046 atm.
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How many moles are in 100 grams of NO3
Answers
According to the given statement, there are 1.612 moles in 100 grams of NO3.
To determine the number of moles in 100 grams of NO3, we first need to know the molar mass of NO3. The molar mass of NO3, which stands for nitrate, is 62.0049 g/mol.
Now we can use the following formula to calculate the number of moles in 100 grams of NO3:
moles = mass / molar mass
moles = 100 g / 62.0049 g/mol
moles = 1.612 mol
Moles are a fundamental unit of measurement in chemistry used to express the amount of a substance. They represent a specific number of atoms, ions, or molecules, which is the Avogadro constant, 6.022 x 10^23. Moles are calculated by dividing the mass of the substance by its molar mass. This allows for a more accurate comparison of different substances in chemical reactions, as it provides a common unit for measuring the amount of each reactant involved.
In the case of NO3, which is nitrate, we can use the number of moles to determine the quantity of the substance needed to react with another substance. This is important in determining the stoichiometry of a reaction, which is the relationship between the reactants and products in a chemical equation. By knowing the number of moles, chemists can accurately predict the products formed in a reaction and calculate the amount of reactant needed for a specific yield.
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E. Mark each description as an exothermic or endothermic reaction. (2 points)
Description
Exothermic
Endothermic
A + heat → B
1
-ΔΗ
Energy diagram:
I
Energy of reactants
greater than energy of
products
Answers
Answer:
1. Endothermic
2. Exothermic
3. Exothermic
4. Endothermic
Explanation:
A P E X
_____ and neutrons are located in the center of the
atom.
I will mark you as brain-
Answers
Answer:
protons and neutrons
Explanation:
trust
Round the measurement to 3 significant figures. 13.06
Answers
Answer: 13.1
Explanation: just round the .06 to 1 creating three sig figs.
you decide to test your pillbugs' preference for an acidic environment versus a nonacidic environment. on one side of the chamber you place filter paper moistened with water. what is appropriate to place on the other side to test this variable?
Answers
you decide to test your pillbugs' preference for an acidic environment versus a nonacidic environment. on one side of the chamber you place filter paper moistened with water. Dry filter paper is appropriate to place on the other side to test this variable.
ABOUT PILLBUGSArmadillidiidae (Pillbugs) is a family of woodlice, a terrestrial crustacean group in the order Isopoda. Unlike members of some other woodlice families, members of this family can roll into a ball, an ability they share with the outwardly similar but unrelated pill millipedes and other animals. This ability gives woodlice in this family their common names of pill bugs or roly polies.Other common names include slaters, potato bugs, and doodle bugs. Most species are native to the Mediterranean Basin, while a few species have wider European distributions. The best-known species, Armadillidium vulgare, was introduced to New England in the early 19th century and has become widespread throughout North America.
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What do you notice about the density of the sinking objects?
Answers
Answer:
if its less Dense than water it will float, if it's more Dense, than water it will sink. if an object weighs more than the same amount of water then it will sink but if it weighs less it will float
Explanation:
Scientist repeats an experiment and gets a
different result. What should the scientist do next
Answers
Answer:
tty to fin out what happend by redoing it
Which sentence provides objective information?
Sunflowers are more beautiful than tulips.
Sunflower seeds taste delicious in salads.
The stem of a sunflower can grow up to 10 feet tall.
Growing a sunflower that is 10 feet tall is very impressive.
Answers
Answer:
Growing a sunflower that is 10 feet tall is very impressive.
Explanation:
Hope it helps
PLEASE HELP
what is density?
Answers
The density of a substance is defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as:
Density = mass / volume
How to determine densityFor example, unknown liquid has a mass of 30.8 g, and a volume of 31.5 mL. What is the density of this liquid?
We can obtain the density as follow:
Mass = 30.8 gVolume = 31.5 mL Density =?Density = mass / volume
Density of liquid = 30.8 / 31.5
Density of liquid = 0.98 g/mL
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The total amount of energy before and after a chemical reaction is the same. Therefore, energy is _____.
created
destroyed
converted
conserved
Answers
Answer:
Option (a) is the correct answer.
Explanation:
The law of conservation of energy states that energy can neither be created nor it can be destroyed. It can only be transformed from one form to another.
Therefore, the total amount of energy before and after a chemical reaction is the same. Thus, energy is conserved.
Therefore, we can conclude that option (a) is the correct answer.
Answer:
conserved
Explanation:
law of conservation of energy says that energy can neither be created or destroyed
Problem #1 : Radioisotopes are used for a variety of medical purposes including as cancer treatments. Attaching an alpha emitter to an antibody allows for a targeted therapy which can be less damaging to healthy tissue than some other cancer treatments. One such alpha emitter is Astatine 211 (211At) which undergoes LaTeX: \alpha α decay (hence the name, alpha emitter).
1.) What isotope is created by the LaTeX: \alpha α decay of 211At? 2.) How many p+, n0, and e- does it have?
Problem #2 : The grand dream of the protoscience called Alchemy was the transmutation of Lead (Pb) into Gold (Au). Thousands of years later, surely we can do better... after all, Platinum (Pt) is what everyone wants these days. We'll start with an isotope of lead, 209Pb which undergoes LaTeX: \beta β - decay. In reality, that is the end of our tale. However, this is a thought exercise and we can do what we want. Using the different types of radioactive decay described above, but still starting with LaTeX: \beta β - decay, how could we get 209Pb to Pt?
1.) What isotope is created by the LaTeX: \beta β - decay of 209Pb?
2.) Come up with a sequence of radioactive decay steps that would then lead to an isotope of Pt.
3.) What isotope of Pt did you create? How many p+, n0, and e- does it have?
Answers
Answer and Explanation: Many nuclei are radioactive, which means they emit particles to become stable. In the process, they also become a different element. There are 3 types of decay:
Alpha decay: it emits a particle of Helium, i.e., emits a particle with 2 as atomic number (Z) and 4 as atomic mass (A);Beta decay: emits an electron: a particle with 0 mass and -1 as atomic number;Gamma decay: emits a high energy form of electromagnetic radiation and it is extremely dangerous and penetrating;Problem #1:
1.) Astatine: Z = 85 and A = 211
Alpha decay: \({{A=211} \atop {Z=85}} \right. At\) ⇒ \({{207} \atop {83}} \right. Bi + {{4} \atop {2}} \right. \alpha\)
The isotope created is Bismuth
Characteristics: Z = 83; e⁻ = 83; n = A - Z = 207 - 83 = 124
The isotope is Bismuth with 83 protons, 83 electrons and 124 neutrons.
Problem #2
1.) Lead: Z = 82 and A = 82
Beta decay: \({{209} \atop {82}} \right. Pb\) ⇒ \({{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta\)
The isotope created is talium.
2.) \({{209} \atop {82}} \right. Pb\) ⇒ \({{209} \atop {81}} \right. Tl+{{0} \atop {-1}} \right. \beta\)
\({{209} \atop {81}} \right. Tl\) ⇒ \({{205} \atop {79}} \right. Au+{{4} \atop {2}} \right. \alpha\)
\({{205} \atop {79}} \right. Au\) ⇒ \({{205} \atop {78}} \right. Pt+{{0} \atop {-1}} \right. \beta\)
3.) The isotope created is \({{205} \atop {78}} \right. Pt\).
p⁺ = 78; e⁻ = 78; n = 127
The isotope created ahs 78 protons, 78 electrons and 127 neutrons.
T/F a single mineral may take on multiple crystalline lattice structures.
Answers
True. A single mineral can take on multiple crystalline lattice structures. This is because the crystalline lattice structure of a mineral is determined by its chemical composition and the conditions under which it forms.
Sometimes, a mineral may form under different conditions or with different impurities present, resulting in a different crystal lattice structure. For example, graphite and diamond are both forms of carbon, but they have different lattice structures due to differences in their formation conditions. Similarly, quartz can exist in different lattice structures depending on the temperature and pressure at which it forms.
So, while a mineral may have a dominant or preferred lattice structure, it is possible for it to take on multiple structures under different conditions.
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Writing a Scientific Argument
Write a scientific argument that answers the question Why is the liquid oxygen machine producing less liquid oxygen than normal?
State your claim and use evidence to support it. For each piece of evidence you use, explain how the evidence supports your claim or refutes another claim. Remember to explain what happened at both the macro and molecular scales.
Answers
Answer: The liquid oxygen machine is producing less liquid oxygen than normal because there's a low attraction between the molecules.
It should be noted that oxygen in its liquid state will take up less space. It can also be stored at a lower pressure than when it's in its gaseous state.
Explanation:
From the complete question, the liquid oxygen evaporates at a slightly higher The reason for this is due to the fact that they have similarly low attraction between molecules.
Is hydrogen a metal or a nonmetal? How many valence electrons does a hydrogen atom have?
Answers
Answer:
hydrogen is a non-metal and it has 1 valence electron
Explanation:
You can find the valence electrons on the bottom left of your periodic table, it is under the atomic number. Hydrogen is a non-metal because hydrogen conducts heat and electricity poorly.
Which type of of star cluster is loose and disorganized? A. binary B. eclipse C. globular or D. open.
Answers
Answer:
Open cluster
Explanation:
Why should I explain?
Answer: D open cluster
Explanation:
Is H2SO4 + NaOH > Na2SO + H2O balanced
Answers
Answer:
H2SO4 + 2NaOH ----> Na2SO4 + 2H2O
Explanation:
This is balanced equation
What is the molar mass of Pb(Cr2O7)2
Answers
Answer:
The molar mass of Pb(Cr2O7)2 is 639.2 g/mol.
Answer:
639 g
Explanation:
Pb(Cr₂O₇)₂
Molar mass of each element:
Pb = 207
Cr = 52
O = 16
now solve:
207 + ( 52 * 2 + 16 * 7 ) * 2
207 + ( 216 ) * 2
207 + 432
639 g
The specific heat of Chloroform is 0.23 cal/ (g°C). If 24g of a substance are heated from 15°C to 75°C, how much heat was added to the system?
Answers
Taking into account the definition of calorimetry and sensible heat, the heat added to the system is 331.2 cal.
Calorimetry
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance c.ΔT is the temperature variation.In this way, between heat and temperature there is a direct proportional relationship.
Heat added to the system in this caseIn this case, you know:
Q= ?c= 0.23 \(\frac{cal}{gC}\)m= 24 gΔT= Tfinal - Tinitial= 75 C - 15 C= 60 CReplacing in the expression to calculate heat exchanges:
Q= 0.23 \(\frac{cal}{gC}\)× 24 g× 60 C
Solving:
Q= 331.2 cal
In summary, the heat added to the system is 331.2 cal.
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Mg emits radiation at 285 nm. What is the frequency (Hz) of this radiation? a. 1.05 x 10^15 b. 1.05 x 10^-3 c. 1.05 x 10^1
d. 1.05 x 10^19
Answers
To determine the frequency of radiation emitted by Mg at 285 nm, we can use the relationship between frequency (Hz), speed of light (c), and wavelength (λ). The correct answer is option d, 1.05 x 10^19 Hz.
The relationship between frequency, wavelength, and the speed of light is given by the equation c = λν, where c is the speed of light (approximately 3.00 x 10^8 m/s), λ is the wavelength in meters, and ν is the frequency in Hz.
To convert the given wavelength from nm (nanometers) to meters, we need to divide it by 10^9. Therefore, 285 nm is equal to 285 x 10^-9 m.
Now, we can rearrange the equation c = λν to solve for ν:
ν = c / λ
Substituting the values, we have:
ν = (3.00 x 10^8 m/s) / (285 x 10^-9 m)
ν = (3.00 x 10^8 m/s) x (1 / (285 x 10^-9 m))
ν ≈ 1.05 x 10^19 Hz
Thus, the frequency of the radiation emitted by Mg at 285 nm is approximately 1.05 x 10^19 Hz, which corresponds to option d.
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