Q: Which of the following is the correct relationship for converting Celsius to Fahrenheit?

$$^\circ\mathrm{F} = (^\circ\mathrm{C} \times \frac{9}{5}) + 32$$

Question 1

Which of the following best describes a crystalline solid?

Accepted Answer

Atoms or molecules are arranged in geometric patterns with long-range, repeating order.

Question 2

A sample of matter is observed to have a definite volume but takes the shape of its container. Which state of matter is this sample most likely in?

Accepted Answer

Liquid

Question 3

Which of the following is an example of a chemical property?

Accepted Answer

The flammability of gasoline

Question 4

Which of the following changes is a physical change?

Accepted Answer

Boiling water to produce steam

Question 5

A mixture of sand and salt is best classified as which type of matter?

Accepted Answer

Heterogeneous mixture

Question 6

Which of the following statements about the law of conservation of mass is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 7

Which of the following is a pure substance that can be decomposed into simpler substances by chemical means?

Accepted Answer

Compound

Question 8

A 50.0 g sample of water is heated from $$20.0\ ^\circ\mathrm{C} to$$ $$30.0\ ^\circ\mathrm{C}. $$The specific heat capacity of water is $$4.184\ \mathrm{J}/\mathrm{g}\ ^\circ\mathrm{C}. $$How much heat is absorbed by the water?

Accepted Answer

$$2,092\ \mathrm{J}$$

Question 9

Which of the following best describes an exothermic reaction?

Accepted Answer

A reaction that releases energy to the surroundings

Question 10

Convert $$25.0\ ^\circ\mathrm{C} to $$Kelvin.

Accepted Answer

$$298.15\ \mathrm{K}$$

Question 11

Which of the following is NOT a physical property?

Accepted Answer

Ability to react with acid

Question 12

A chemical reaction absorbs $$150.0\ \mathrm{kJ} of $$energy. Which term best describes this reaction?

Accepted Answer

Endothermic

Question 13

Which of the following is a homogeneous mixture?

Accepted Answer

Sweetened tea

Question 14

Which of the following best explains why gases are compressible?

Accepted Answer

The atoms or molecules in a gas are separated by large distances and are not in contact with each other.

Question 15

Which of the following is the correct relationship for converting Celsius to Fahrenheit?

Accepted Answer

$$^\circ\mathrm{F} = (^\circ\mathrm{C} 	imes \frac{9}{5}) + 32$$

Question 16

A candy bar contains $$225\ \mathrm{Cal} of $$nutritional energy. How many joules does it contain? ($$1\ \mathrm{Cal} = 1000\ \mathrm{cal}$$, $$1\ \mathrm{cal} = 4.184\ \mathrm{J})$$

Accepted Answer

$$941,400\ \mathrm{J}$$

Question 17

Which of the following best describes the difference between an element and a compound?

Accepted Answer

An element cannot be broken down into simpler substances by chemical means, while a compound can.

Question 18

Which of the following is a correct statement about energy according to the law of conservation of energy?

Accepted Answer

Energy can be transferred or transformed but cannot be created or destroyed.

Question 19

A 10.0 g sample of gold ($$c = 0.128\ \mathrm{J}/\mathrm{g}\ ^\circ\mathrm{C}) is $$heated from $$25.0\ ^\circ\mathrm{C} to$$ $$50.0\ ^\circ\mathrm{C}. $$How much heat is required?

Accepted Answer

$$32.0\ \mathrm{J}$$

Question 20

Which of the following best describes the difference between temperature and heat?

Accepted Answer

Temperature is a measure of the thermal energy of matter, while heat is the transfer of thermal energy due to a temperature difference.

Chapter 3: Matter and Energy – Structured Study Notes

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