Chemistry Notes

Topics: Oxygen, Chemical substance, Chemical element Pages: 5 (576 words) Published: April 4, 2013
MATTER AND CHANGEName _____________________________________ PRACTICE PROBLEMS Period _________________ Date ______________

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? _________________________________


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


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


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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