Q: Which formula is used to calculate the heat absorbed by an object, given its mass, specific heat, and temperature change?

$$q = m \times C_s \times \Delta T$$

Q: Which equation represents the relationship between heat, mass, specific heat, and temperature change?

$$q = m \times C_s \times \Delta T$$

Question 1

Which of the following best describes the energy transformation when a spring is compressed and then released, as shown in the diagram with the ball and spring?

Accepted Answer

Potential energy is converted to kinetic energy.

Question 2

A match is struck and ignites, as shown in the image. Which type of energy is primarily released during this process?

Accepted Answer

Thermal energy and light energy, both forms of kinetic energy.

Question 3

According to the law of conservation of energy, what happens to the energy lost by a system during a chemical reaction?

Accepted Answer

It is gained by the surroundings.

Question 4

Which equation correctly represents the relationship between heat capacity, temperature change, and heat absorbed?

Accepted Answer

$$q = C 	imes \Delta T$$

Question 5

If a system releases energy to its surroundings, which of the following statements is true?

Accepted Answer

$$\Delta E_{	ext{system}}  0$$

Question 6

Which of the following is a state function?

Accepted Answer

Internal energy ($$E)$$

Question 7

A billiard ball with an initial kinetic energy of 5.0 J rolls and collides with another ball, transferring 4.5 J of kinetic energy and losing 0.5 J as heat. What is the change in internal energy ($$\Delta E) $$for the first ball?

Accepted Answer

$$\Delta E = -5.0 	ext{ J}$$

Question 8

Which formula is used to calculate the heat absorbed by an object, given its mass, specific heat, and temperature change?

Accepted Answer

$$q = m 	imes C_s 	imes \Delta T$$

Question 9

In the context of energy transfer, what does the equation $$\Delta E_{	ext{sys}} = -\Delta E_{	ext{surr}}$$ represent?

Accepted Answer

The energy lost by the system is gained by the surroundings.

Question 10

Which type of energy is associated with the temperature of a substance?

Accepted Answer

Thermal energy

Question 11

A block of metal at 55°C is placed in water at 25°C. What is the direction of heat flow?

Accepted Answer

From the metal to the water

Question 12

Which of the following best describes the concept of a state function?

Accepted Answer

A property that depends only on the initial and final states, not the path taken.

Question 13

If the reactants in a chemical reaction have higher internal energy than the products, what is the sign of $$\Delta E$$ for the system?

Accepted Answer

Negative ($$\Delta E \u003c 0)$$

Question 14

Which of the following is NOT a form of kinetic energy?

Accepted Answer

Chemical energy

Question 15

In the context of thermochemistry, what is the system?

Accepted Answer

The material or process under study for energy changes.

Question 16

Which equation represents the relationship between heat, mass, specific heat, and temperature change?

Accepted Answer

$$q = m 	imes C_s 	imes \Delta T$$

Question 17

If a chemical reaction absorbs heat from the surroundings, what type of reaction is it?

Accepted Answer

Endothermic

Question 18

Which of the following statements about energy transfer is correct?

Accepted Answer

The surroundings gain the exact amount of energy lost by the system.

Question 19

Which diagram best illustrates the concept of energy transfer between a system and its surroundings?

Accepted Answer

A gauge showing energy lost by the system and gained by the surroundings.

Thermochemistry: Energy, Heat, and Work in Chemical Systems

Guida di studio - Domande di pratica

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