Chapter 3

Question 1

What is a pure substance?

Answer 1

Composed of only one type of atom or molecule

Question 2

What is an element?

Answer 2

A pure substance that can’t be broken down into simpler substances

Question 3

What is a compound, and what is a mixture?

Answer 3

A compound is a pure substance composed of different atoms that are bonded, and a mixture is composed of different atoms that aren’t bonded.

Question 4

What is a physical property?

Answer 4

a property that a substance displays without changing its composition

Question 5

What is a chemical change?

Answer 5

a property that a substance displays only through changing its composition

Question 6

Is water boiling a chemical or physical change?

Answer 6

physical

Question 7

Is iron rusting a physical or chemical change?

Answer 7

chemical

Question 8

What is the equation for heat capacity?

Answer 8

q=(m)(c)change in T

Question 9

How much heat must 2.5g of gallium absorb from your hand to raise its temperature from 25.0 degrees Celsius to 29.9? (specific heat = 0.372)

Answer 9

4.6 J

Question 10

Calculate the amount of heat required to raise the temp of a 65 g sample of water from 32 C to 65 C (specific heat = 4.184)

Answer 10

9.0 * 10^3 J

Question 11

Calculate the amount of heat required to heat a 3.5 kg gold bar from 21 C to 67 C
(specific heat = 0.128)

Answer 11

2.1*10^3 J

Question 12

If 89J of heat are added to a pure gold coin with a mass of 12g, what is the temperature change? (specific heat = 0.128)

Answer 12

58 degrees C