Chemistry Notes

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MATTER AND CHANGEName _____________________________________ PRACTICE PROBLEMS Period _________________ Date ______________

SECTION 2.1 MATTER
1. Which of the following is not a physical change?
a. dissolving sugar in water
b. burning gasoline in an engine
c. evaporating sea water to obtain salt
d. slicing a piece of bread

2. Which of the following is not a property of a gas?
a. has a definite shape
b. has no definite volume
c. assumes the shape of its container
d. easily compressible

3. Which of the following is not a physical property of sucrose? a. solid at room temperature
b. decomposes when heated
c. dissolves in water
d. tastes sweet

4. Which of the following is typically in a different physical state than the other three at room temperature? a. salt
b. sugar
c. flour
d. water

5. Complete the following table.
|Physical State |Definite Shape? |Definite Volume? |Readily compressible? | |gas | | | | | |no | |no | | |yes | | |

Use Table 2.1 on page 29 in your textbook to answer the following questions.

6. Which substance is a colored gas? ______________________

7. Which liquids boil at a lower temperature than water? ___________________________________________

8. For which substances would 2 cm3 have a mass greater than 6 g? _________________________________

SECTION 2.2 MIXTURES

1. How might one separate a mixture of water and salt?

2. What is a homogeneous mixture?

3. Which of the following mixtures are homogeneous? Which are heterogeneous?

________________________a. gasoline

________________________b. chunky peanut butter

________________________c. oil and vinegar salad dressing

________________________d. orange soda

4. Which of the following are pure substances? Which are mixtures?

________________________a. ethanol

________________________b. vinegar

________________________c. motor oil

________________________d. helium

SECTION 2.3 ELEMENTS AND COMPOUNDS

1. What elements make up chloroform, chemical formula CHCl3?

2. Name the elements represented by the following chemical symbols.

a. Pb ________________________________

b. K ________________________________

c. Au _______________________________

d. Fe _________________________________

3. Classify the following as elements, compounds, or mixtures.

a. salt _______________________________

b. water ____________________________

c. iron ______________________________

d. sterling silver _____________________

4. Write the chemical symbol for each of the following elements.

a. chlorine _________

b. sodium _________

c. silver __________

d. carbon __________

5. A liquid is allowed to evaporate and leaves no residue. Can you determine whether it was an element, a compound, or a mixture? Explain your answer.

6. Which of the following is not an element?
a. copper
b. sulfur
c. ammonia
d. helium

SECTION 2.4 CHEMICAL REACTIONS

1. Which one of the following is a chemical change?
a. gasoline boils
b. lead is added to gasoline
c. gasoline burns
d. gasoline is poured into a tank

2. Classify each of the following changes as physical or chemical.

__________________ a. dew is dried...
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