All categories

2 years ago

Part H

Chemistry

1 answer:

Dvinal [7]2 years ago

7 0

Answer:

See explanation.

Explanation:

-_-

Part H: C

Review:

1. joules

2. c

3. kinetic energy

4. mass

5. heat and light

6. conduction, convection, or radiation

7. the amount of energy in the universe is constant / energy can neither be created nor destroyed

8. Law of Conservation of Energy / Impossibility of Perpetual Motion

9. F

10. The earth's core.

11. Potential energy.

12. Nice to know.

a) Sir Seymour. The kinetic energy equation has velocity squared. Increasing velocity is much more destructive..

b) Jupiter. Weight is gravity acting on mass. Gravity increases with mass. So Jupiter.

13. True.

14. Second Law of Thermodynamics describes heat flow from hot to cold objects. So, for the refrigerator to work, it needs to steadily expell hot air or objects inside won't cool as they releases heat to the surrounding air inside the refrigerator.

You might be interested in

Sucrose is a non volatile, non-ionizing solute in water.

Natasha2012 [34]

When a non volatile solute is added to a solvent, the vapor pressure of the solvent will decrease.

Vapor pressure is a colligative property. Which means that it will be affected by the number of particles of solute.

The relationship between the concentration of the solute and the vapor pressure is given by Roult's Law

ΔP = Xsolute * P, where ΔP is vapor pressure lowering, Xsolute is the molar fractionof the solute, and P is the vapor pressure of the solvent.

Then lets find Xsolute

X solute = # moles solute / # moles solution

# moles solute = 75.0 grams / molar mass

molar mass of C12H22O11 = 12*12g/mol + 22*1g/mol + 11*16g/mol = 342 g/mol

# moles solute = 75.0/342 mol = 0.219 mol

# moles of solvent = grams of solvent / molar mass of solvent

# moles of solvent = 180 grams /18 g/mol = 10 mols

Xsolute = 0.219 mol solute / (10 + 0.219) mol solution =0.0215

ΔP = 0.0215*26.7 torr = 0.57 torr

Answer= 0.57 torr

7 0

3 years ago

Calculate the volume occupied by 55.5 moles of water at STP.

Tems11 [23]

Answer:

Volume occupied by 55.5 moles of water gas at STP = 1240 Liters.

Explanation:

1st keep in mind that 'volume' in the context of problems like this apply only to the gas phase form of the substance. Water in solid form (ice) or liquid form (liquid water) do not apply. Volume in this case is referred to as 'molar volume' and is a gas occupying 22.4 liters at STP conditions (0°C, 1Atm).

So, if 1 molar volume of water gas (steam) occupies 22.4 Liters at STP, then 55.5 moles of water gas occupies 22.4 Liters/mole x 55.5 moles = 1243.2 Liters, or 1240 Liters (3 sig. figs.). :-)

4 0

3 years ago

What is the vapor pressure in equilibrium with when the substance has reached its boiling point

S_A_V [24]

Answer:

The boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it.The normal boiling point of a liquid is the temperature at which its vapor pressure is equal to one atmosphere (760 torr). Microscopic view inside a bubble in boiling water.

Explanation:

8 0

3 years ago

Which two atoms could be the "before'' and ''after'' of an alpha ejection

spin [16.1K]

The answer would be uranium and thorium. When an alpha ejects a particle, it will create a new atom. So, when uranium ejects an alpha particle, it will produce thorium. They call this process as the alpha decay. Alpha decay often happens on atoms that are abundant nuclei such as uranium, radium, and thorium.

4 0

4 years ago

10.

Ugo [173]

Answer:

Density, $\rho=24.68\ g/cm^3$