Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a definite ratio.

Question 2

A brass instrument is made from copper and zinc atoms mixed together. What type of matter is brass?

Accepted Answer

Homogeneous mixture

Question 3

Which physical state of matter has a definite shape and definite volume?

Accepted Answer

Solid

Question 4

Which of the following is a chemical change?

Accepted Answer

Iron rusting in the presence of water

Question 5

A patient with hypothermia has a body temperature of $$34.0\ ^\circ \mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$307.0\ \mathrm{K}$$

Question 6

Which equation correctly converts a temperature from Celsius to Fahrenheit?

Accepted Answer

$$F = 1.8C + 32$$

Question 7

Which of the following is an example of potential energy?

Accepted Answer

Gasoline stored in a gas tank

Question 8

How many calories are obtained from 150 J of energy? (Use $$1\ \mathrm{cal} = 4.184\ \mathrm{J})$$

Accepted Answer

$$0.86\ \mathrm{cal}$$

Question 9

A 24.8 g sample of metal absorbs 275 J of energy, raising its temperature from $$18.0\ ^\circ \mathrm{C} to$$ $$38.0\ ^\circ \mathrm{C}. $$What is the specific heat of the metal? (Use $$q = m \cdot c \cdot \Delta T)$$

Accepted Answer

$$0.56\ \mathrm{J/g\ ^\circ C}$$

Question 10

Which statement best explains why sand in the desert is hot during the day and cool at night?

Accepted Answer

Sand has a low specific heat, so it heats and cools quickly.

Question 11

How much energy (in kJ) is needed to melt 32.0 g of ice at $$0\ ^\circ \mathrm{C}$$? (Use heat of fusion for water: $$334\ \mathrm{J/g})$$

Accepted Answer

$$10.7\ \mathrm{kJ}$$

Question 12

Which process describes the direct conversion of a solid to a gas without passing through the liquid state?

Accepted Answer

Sublimation

Question 13

A cup of whole milk contains 12 g of carbohydrate, 9 g of fat, and 9 g of protein. Using energy values of $$4\ \mathrm{kcal/g}$$ for carbohydrate, $$9\ \mathrm{kcal/g}$$ for fat, and $$4\ \mathrm{kcal/g}$$ for protein, what is the total energy content?

Accepted Answer

$$130\ \mathrm{kcal}$$

Question 14

Which of the following is a heterogeneous mixture?

Accepted Answer

Peach pie

Question 15

Which of the following best describes the energy change when water vapor condenses to liquid at $$100\ ^\circ \mathrm{C}$$?

Accepted Answer

Heat is released

Question 16

Which equation is used to calculate the heat required to change the temperature of a substance?

Accepted Answer

$$q = m \cdot c \cdot \Delta T$$

Question 17

A plateau (horizontal line) on a heating curve represents:

Accepted Answer

A change of state

Question 18

Which of the following is NOT a physical property?

Accepted Answer

Ability to burn

Question 19

Which of the following statements about the Kelvin scale is correct?

Accepted Answer

Kelvin scale starts at absolute zero.

Chapter 3: Matter and Energy – Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드