2 If a material contains two or more elements joined in a fixed proportion, it is a(an) a. mixture.b. atom.c. solution.d. compound.
3 Which of the following is a pure substance? a. solutionsb. homogeneous mixturesc. compoundsd. colloids
4 A substance that is made up of only one kind of atom is a(an) a. compound.b. element.c. homogeneous mixture.d. solution.
5 Which of the following is a characteristic of a mixture? a. has varying propertiesb. contains only pure substancesc. has a fixed compositiond. both a and b
6 A mixture that appears to contain only one substance is a(an) a. homogeneous mixture.b. compound.c. heterogeneous mixture.d. element.
7 A mixture can be classified as a solution, suspension, or colloid based on the a. number of particles it contains.b. color of its particles.c. size of its largest particles.d. size of its smallest particles.
8 Filtration can be used to separate mixtures based on a. their boiling points.b. their melting points.c. their densities.d. the size of their particles.
9 What method can be used to separate salt water that can pass through a filter? a. filtrationb. strainingc. distillationd. screening
10 Which of the following is a physical change? a. cutting a piece of wood in halfb. burning a piece of woodc. rust forming on an iron fenced. both b and c
11 Which of the following is a chemical change? a. ice meltingb. ice being carvedc. water boilingd. none of these
12 Which of the following is a clue of a chemical change? a. iron changes color when heatedb. gas bubbles form in boiling waterc. balls of wax form when melted wax is poured into ice waterd. a gas forms when vinegar and baking soda are mixed
13 Matter that always has exactly the same composition is classified as a(an) A. pure substanceB. homogeneous mixtureC. heterogeneous mixtureD. none of these
14 An element has a fixed composition because it contains only one type of A. compoundB. atomC. mixtureD. solution
15 How do changes increasing temperature usually affect the viscosity of a liquid? A. decreases viscosityB. increases viscosityC. Both A and BD. Not A or B