MATTER AND CHANGE
Name _____________________________________ PRACTICE PROBLEMS
Period _________________ Date ______________
SECTION 2.1 MATTER
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
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
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
Which of the following is typically in a different physical state than the other three at room temperature? a. salt
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.
Which substance is a colored gas? ______________________
Which liquids boil at a lower temperature than water? ___________________________________________
For which substances would 2 cm3 have a mass greater than 6 g? _________________________________
SECTION 2.2 MIXTURES
How might one separate a mixture of water and salt?
What is a homogeneous mixture?
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
What elements make up chloroform, chemical formula CHCl3?
Name the elements represented by the following chemical symbols.
a. Pb ________________________________
b. K ________________________________
c. Au _______________________________
d. Fe _________________________________
Classify the following as elements, compounds, or mixtures.
a. salt _______________________________
b. water ____________________________
c. iron ______________________________
d. sterling silver _____________________
Write the chemical symbol for each of the following elements.
a. chlorine _________
b. sodium _________
c. silver __________
d. carbon __________
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.
Which of the following is not an element?
SECTION 2.4 CHEMICAL REACTIONS
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
Classify each of the following changes as physical or chemical.
__________________ a. dew is dried...
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