# Chapter 10 Quiz 2 - Chemistry

Approved & Edited by ProProfs Editorial Team
At ProProfs Quizzes, our dedicated in-house team of experts takes pride in their work. With a sharp eye for detail, they meticulously review each quiz. This ensures that every quiz, taken by over 100 million users, meets our standards of accuracy, clarity, and engagement.
| Written by Muitran
M
Muitran
Community Contributor
Quizzes Created: 18 | Total Attempts: 45,611
Questions: 14 | Attempts: 82  Settings  • 1.

### The SI unit of energy is the __________. (Do not use the abbreviation.)

Explanation
The SI unit of energy is the joule, which is represented by the symbol "J". It is named after the English physicist James Prescott Joule, who made important contributions to the study of energy and heat. The joule is defined as the amount of energy transferred when a force of one newton is applied over a distance of one meter in the direction of the force. It is a fundamental unit of energy in the International System of Units (SI) and is commonly used in various fields such as physics, engineering, and chemistry.

Rate this question:

• 2.

### The _______ is a unit of energy defined as the amount of heat needed to raise one gram of water by one degree Celsius.

Explanation
The term "calorie" refers to a unit of energy that is defined as the amount of heat required to raise the temperature of one gram of water by one degree Celsius. It is a small unit of measurement commonly used in nutrition and dietetics. On the other hand, "Calorie" with a capital "C" is a larger unit of energy equivalent to 1000 calories, often used to represent the energy content of food and beverages.

Rate this question:

• 3.

### The ____________ is the amount of energy required to raise one gram of a substance by one degree Celsius.

• A.

Kelvin

• B.

Specific heat

• C.

Calorie

• D.

Temperature

B. Specific heat
Explanation
Specific heat is the correct answer because it refers to the amount of energy required to raise the temperature of one gram of a substance by one degree Celsius. It is a property that is unique to each substance and helps determine how much heat energy is needed to cause a change in temperature.

Rate this question:

• 4.

### What is the symbol for enthalpy?

• A.

E

• B.

T

• C.

H

• D.

W

C. H
Explanation
The symbol for enthalpy is H. Enthalpy is a thermodynamic property that represents the total heat content of a system at constant pressure. It is often used in the study of energy transfer during chemical reactions and phase changes. The letter H is commonly used to represent enthalpy in equations and calculations.

Rate this question:

• 5.

### Mathematically, what does mean?

• A.

Initial - final

• B.

Final - initial

• C.

Initial + final

• D.

Final + initial

B. Final - initial
Explanation
The correct answer is "final - initial". In mathematics, the expression "final - initial" represents the difference between the final value and the initial value. It is a subtraction operation that calculates the change or the gap between two values. By subtracting the initial value from the final value, we can determine the numerical difference between them.

Rate this question:

• 6.

### When the value of is negative, that means that a chemical reaction ___________.

• A.

Is producing heat

• B.

Is taking in heat

• C.

Is spontaneous

• D.

Is nonspontaneous

A. Is producing heat
Explanation
When the value of ΔH (change in enthalpy) is negative, it indicates that a chemical reaction is producing heat. This means that the reaction is exothermic, releasing energy in the form of heat to the surroundings.

Rate this question:

• 7.

### Entropy is defined as the _____________.

• A.

Randomness of a system

• B.

Heat required to complete a reaction

• C.

Spontaneity of a chemical reaction

• D.

Work a system is able to perform

A. Randomness of a system
Explanation
Entropy is a measure of the randomness or disorder in a system. It quantifies the number of microstates or possible arrangements that a system can have. A system with high entropy is more disordered and has more possible arrangements, while a system with low entropy is more ordered and has fewer possible arrangements. Therefore, the correct answer is "randomness of a system".

Rate this question:

• 8.

### The second law of thermodynamics states that ____________.

• A.

Heat will always move to places of lower termperatures

• B.

Energy can neither be created nor destroyed

• C.

The mass of the universe is constant

• D.

The entropy of the universe is always increasing

D. The entropy of the universe is always increasing
Explanation
The second law of thermodynamics states that the entropy of the universe is always increasing. Entropy is a measure of the disorder or randomness in a system. According to this law, natural processes tend to move towards a state of greater disorder. This means that energy tends to disperse and become less concentrated over time. It also implies that it is impossible to have a perfectly efficient process, as some energy will always be lost as waste heat. This law has important implications for understanding the behavior of energy and heat in various systems.

Rate this question:

• 9.

### Energy will not disperse into areas of lower energy.

• A.

True

• B.

False

B. False
Explanation
Energy will disperse into areas of lower energy. This is because energy naturally flows from areas of higher energy to areas of lower energy in order to achieve equilibrium. This principle is known as the second law of thermodynamics, which states that energy tends to spread out and become more evenly distributed over time. Therefore, the statement that energy will not disperse into areas of lower energy is incorrect.

Rate this question:

• 10.

### A positive denotes a system that has absorbed energy, resulting in higher potential energy of the products

• A.

True

• B.

False

A. True
Explanation
A positive sign in this context indicates that the system has absorbed energy, which means that the potential energy of the products has increased. This suggests that the system has undergone a reaction or process that resulted in the accumulation of energy, leading to higher potential energy in the products. Therefore, the statement is true.

Rate this question:

• 11.

### Matter with high kinetic energy tends to clump together.

• A.

True

• B.

False

B. False
Explanation
Matter with high kinetic energy tends to spread out rather than clump together. This is because particles with high kinetic energy have more energy to move around and collide with other particles, causing them to disperse. Therefore, the statement is false.

Rate this question:

• 12.

### _____________ reaction occurs naturally without any outside input into the system.

• A.

An endothermic

• B.

An endothermic

• C.

A spontaneous

• D.

A nonspontaneous

C. A spontaneous
Explanation
A spontaneous reaction occurs naturally without any outside input into the system. This means that the reaction will occur on its own without the need for any additional energy or assistance. In contrast, an endothermic reaction requires an input of energy from the surroundings in order to proceed. Therefore, the correct answer is "A spontaneous."

Rate this question:

• 13.

### Which of the following conditions are necessary for a good calorimeter to be useful?

• A.

• B.

• C.

Maintains an open system

• D.

Ensures good energy transfer between the contents and the outer environment

Explanation
A good calorimeter needs to be made of an insulator because it should minimize heat transfer between the contents of the calorimeter and the outer environment. This ensures that the calorimeter accurately measures the heat absorbed or released by the substances being studied, without any interference from the surrounding environment. A conductor would allow heat to easily transfer in and out of the calorimeter, leading to inaccurate measurements. Maintaining an open system and ensuring good energy transfer are not necessary conditions for a good calorimeter to be useful.

Rate this question:

• 14.

### A _____________ is an apparatus used to determine the enthalpy change of a reaction. Back to top