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
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?
________________________b. chunky peanut butter
________________________c. oil and vinegar salad dressing
________________________d. orange soda
4. Which of the following are pure substances? Which are mixtures?
________________________c. motor oil
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?
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...