Q: A student heats 50.0 g of water from $$20.0^\\circ C to$$ $$80.0^\\circ C. If $$the specific heat of water is $$4.18 \\mathrm{J/g}^\\circ C$$, how much heat is absorbed?

$$Q = m \\times c \\times \\Delta T = 50.0 \\times 4.18 \\times (80.0 - 20.0) = 12,540 \\mathrm{J}$$

Q: Convert $$25.0^0C to $$Fahrenheit using the correct formula.

$$T_F = 1.8 \\times 25.0 + 32 = 77.0^0F$$

Q: A 10.0 g sample of ice at $$0^0C$$ absorbs $$3340 \\mathrm{J} of $$heat. What is the heat of fusion for water in $$\\mathrm{J/g}$$?

$$q = m \\times \\Delta H_f \\Rightarrow \\Delta H_f = \\frac{3340}{10.0} = 334 \\mathrm{J/g}$$

Q: A 25.0 g sample of water at $$100^0C is $$converted to steam at $$100^C. If $$the heat of vaporization is $$2260 \\mathrm{J/g}$$, how much heat is required?

$$q = m \\times \\Delta H_{vap} = 25.0 \\times 2260 = 56,500 \\mathrm{J}$$

Question 1

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Salt water

Question 2

Which statement best describes a compound?

Accepted Answer

A substance composed of two or more elements always combined in the same proportion

Question 3

Which of the following is a physical change?

Accepted Answer

Ice melting to form liquid water

Question 4

A sample of gold is classified as which of the following?

Accepted Answer

Element

Question 5

Which property is NOT a physical property of matter?

Accepted Answer

Ability to react with acid

Question 6

Which of the following best describes the particles in a liquid?

Accepted Answer

Particles are close together but mobile

Question 7

A student heats 50.0 g of water from $$20.0^\circ C to$$ $$80.0^\circ C. If $$the specific heat of water is $$4.18 \mathrm{J/g}^\circ C$$, how much heat is absorbed?

Accepted Answer

$$Q = m \times c \times \Delta T = 50.0 \times 4.18 \times (80.0 - 20.0) = 12,540 \mathrm{J}$$

Question 8

Which of the following statements about temperature scales is correct?

Accepted Answer

The Kelvin scale has no negative temperatures and 0 K is absolute zero.

Question 9

Convert $$25.0^ 0C to $$Fahrenheit using the correct formula.

Accepted Answer

$$T_F = 1.8 \times 25.0 + 32 = 77.0^ 0F$$

Question 10

Which process is an example of a chemical change?

Accepted Answer

Burning a piece of paper

Question 11

A 10.0 g sample of ice at $$0^ 0C$$ absorbs $$3340 \mathrm{J} of $$heat. What is the heat of fusion for water in $$\mathrm{J/g}$$?

Accepted Answer

$$q = m \times \Delta H_f \Rightarrow \Delta H_f = \frac{3340}{10.0} = 334 \mathrm{J/g}$$

Question 12

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the composition varies from one part to another and the different parts are visible

Question 13

Which of the following is a correct statement about the energy changes during the melting of ice?

Accepted Answer

Heat is absorbed by the ice, but the temperature remains constant until all the ice has melted.

Question 14

A 25.0 g sample of water at $$100^ 0C is $$converted to steam at $$100^ C. If $$the heat of vaporization is $$2260 \mathrm{J/g}$$, how much heat is required?

Accepted Answer

$$q = m \times \Delta H_{vap} = 25.0 \times 2260 = 56,500 \mathrm{J}$$

Question 15

Which of the following best describes potential energy?

Accepted Answer

Energy stored due to the position or composition of an object

Question 16

Which of the following is the correct formula to convert Celsius to Kelvin?

Accepted Answer

$$T_K = T_C + 273.15$$

Question 17

A patient’s temperature is measured as $$102.2^ 0F. $$What is this temperature in Celsius?

Accepted Answer

$$T_C = \frac{102.2 - 32}{1.8} = 39.0^ 0C$$

Question 18

Which of the following statements about gases is correct?

Accepted Answer

Gases have an indefinite shape and volume, and their particles move very fast and are far apart.

Question 19

Which of the following best explains why the temperature of a substance does not change during a phase change?

Accepted Answer

The energy added is used to break intermolecular forces rather than increase kinetic energy.

Classification, States, and Properties of Matter; Temperature and Energy in GOB Chemistry

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