Question 1

According to the 1st Law of Thermodynamics, which statement best describes the relationship between energy, the system, and the surroundings?

Accepted Answer

Energy is transferred between the system and surroundings, but cannot be created or destroyed.

Question 2

In a chemical reaction occurring in a beaker, which of the following best represents the 'system'?

Accepted Answer

The chemical reaction or substance being studied.

Question 3

A chemist places 30.0 g of a metal into an insulated beaker containing 615.5 g of water at 42.18°C. The metal gains 19.11 kJ of energy. What is the sign of $$q ($$heat) for the metal and for the water?

Accepted Answer

$$q_{metal} is $$positive, $$q_{water} is $$negative.

Question 4

Which equation correctly represents the 1st Law of Thermodynamics?

Accepted Answer

$$\Delta E = q + w$$

Question 5

If a system absorbs heat from the surroundings, what is the sign of $$q$$ and what type of process is this?

Accepted Answer

$$q is $$positive; endothermic process.

Question 6

During a heat application, if heat flows from hot to cold, which of the following is true?

Accepted Answer

The hot object loses heat and the cold object gains heat.

Question 7

In the context of work, which scenario describes work being done ON the system?

Accepted Answer

The surroundings compress the system.

Question 8

Which of the following best describes the surroundings in a thermodynamic experiment?

Accepted Answer

Everything not included in the system.

Question 9

A frictionless piston compresses a gas in a cylinder. What is the sign of $$w ($$work) for the system?

Accepted Answer

$$w is $$negative.

Question 10

Which of the following is a correct statement about heat ($$q) $$and work ($$w) in $$thermodynamics?

Accepted Answer

Heat and work are both forms of energy transfer.

Question 11

If a system releases 50 J of heat to the surroundings and the surroundings do 20 J of work on the system, what is the change in internal energy ($$\Delta E) of $$the system?

Accepted Answer

$$\Delta E = -30 	ext{ J}$$

Question 12

Which of the following best describes an exothermic process?

Accepted Answer

The system releases heat to the surroundings.

Question 13

In a laboratory experiment, a reaction causes the temperature of the water in a beaker to decrease. What does this indicate about the direction of heat flow?

Accepted Answer

Heat flowed from the water to the reaction system.

Question 14

Which of the following is NOT a correct statement about the system and surroundings?

Accepted Answer

The system always includes the entire laboratory.

Question 15

A metal sample is heated and then placed in water. If the final temperature of the water increases, what can be concluded about the direction of heat flow?

Accepted Answer

Heat flowed from the metal to the water.

Question 16

Which of the following equations correctly relates heat, work, and change in internal energy for a closed system?

Accepted Answer

$$\Delta E = q + w$$

Question 17

In a heat application scenario, which of the following is true when heat is transferred from a hot object to a cold object?

Accepted Answer

The hot object loses heat and the cold object gains heat.

Question 18

Which of the following best describes the concept of work in thermodynamics?

Accepted Answer

Work is the transfer of energy by the movement of molecules against a force.

Energy, Heat, and Work in Thermodynamics: GOB Chemistry Study Notes

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