Q: A hot object at $80^\circ\text{C}$ is placed in a room at $20^\circ\text{C}$. According to Newton's Law of Cooling, which equation best describes the rate of temperature change?

$\text{Rate} = (T_{\text{object}} - T_{\text{environment}})$

Q: Which equation represents the heat energy required to change the temperature of a substance?

$Q = m \times c \times \Delta T$

Question 1

A sealed syringe contains air at a pressure of 1 atm and a volume of 50 mL. If the plunger is pushed in so the volume decreases to 25 mL at constant temperature, what is the new pressure inside the syringe according to Boyle's Law?

Accepted Answer

$2.0\ 	ext{atm}$

Question 2

Which of the following best explains why ice floats on water?

Accepted Answer

Ice is less dense than water because its molecular structure forms a hexagonal lattice.

Question 3

A metal block with a mass of $500\ 	ext{g}$ and a specific heat capacity of $0.9\ 	ext{J/g} \cdot 	ext{K}$ is heated from $20^\circ	ext{C}$ to $70^\circ	ext{C}$. How much heat energy is absorbed by the block?

Accepted Answer

$22,500\ 	ext{J}$

Question 4

Which law states that the pressure applied to a confined fluid is transmitted equally in all directions?

Accepted Answer

Pascal's Principle

Question 5

A hot object at $80^\circ	ext{C}$ is placed in a room at $20^\circ	ext{C}$. According to Newton's Law of Cooling, which equation best describes the rate of temperature change?

Accepted Answer

$	ext{Rate} = (T_{	ext{object}} - T_{	ext{environment}})$

Question 6

Which of the following processes releases energy to the surroundings?

Accepted Answer

Freezing

Question 7

A balloon is filled with helium and released into the atmosphere. As it rises, the external pressure decreases. What happens to the volume of the balloon, assuming temperature remains constant?

Accepted Answer

The volume increases.

Question 8

Which equation correctly expresses the relationship for pressure in a fluid at rest?

Accepted Answer

$P = F / A$

Question 9

A 2 kg block of ice at $0^\circ	ext{C}$ melts completely. If the latent heat of fusion for ice is $334\ 	ext{J/g}$, how much energy is required for the phase change?

Accepted Answer

$668,000\ 	ext{J}$

Question 10

Which statement best describes the Second Law of Thermodynamics?

Accepted Answer

Heat flows naturally from hot to cold, and disorder (entropy) always increases.

Question 11

A hydraulic lift uses oil to transmit force. If a force of $500\ 	ext{N}$ is applied to a piston with an area of $0.01\ 	ext{m}^2$, what is the pressure transmitted to the fluid?

Accepted Answer

$5,000\ 	ext{Pa}$

Question 12

Which of the following best explains why a fast-moving stream of air over an airplane wing creates lift?

Accepted Answer

The pressure above the wing decreases due to Bernoulli's Principle.

Question 13

Which formula gives the density of a substance?

Accepted Answer

$\rho = m / V$

Question 14

A sealed container holds $2\ 	ext{mol}$ of an ideal gas at $300\ 	ext{K}$ and $1\ 	ext{atm}$ pressure. What is the volume of the container? (Use $R = 0.0821\ 	ext{L} \cdot 	ext{atm} / 	ext{mol} \cdot 	ext{K}$)

Accepted Answer

$49.26\ 	ext{L}$

Question 15

Which process involves heat transfer by electromagnetic waves and does not require a medium?

Accepted Answer

Radiation

Question 16

A block of aluminum (specific heat $0.90\ 	ext{J/g} \cdot 	ext{K}$, mass $200\ 	ext{g}$) is heated from $25^\circ	ext{C}$ to $75^\circ	ext{C}$. How much heat is required?

Accepted Answer

$9,000\ 	ext{J}$

Question 17

Which of the following is NOT a consequence of the greenhouse effect?

Accepted Answer

Earth's atmosphere becomes cooler than space.

Question 18

During boiling, what happens to the energy supplied to the liquid?

Accepted Answer

It breaks intermolecular bonds, allowing molecules to escape as vapor.

Question 19

Which equation represents the heat energy required to change the temperature of a substance?

Accepted Answer

$Q = m 	imes c 	imes \Delta T$

Question 20

A diver finds that the pressure at a depth of 10 meters in water is higher than at the surface. Which principle explains this?

Accepted Answer

Hydrostatic Pressure Equation: $P = \rho g h$

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