chem CH3

How would you classify sugar? A pure substance - compound B mixture - heterogeneous C pure substance - element D mixture - homogeneous E none of the above

A

A pure substance is: A composed of two or more different types of atoms or molecules combined in variable proportions. B composed of only one type of atom or molecule. C composed of two or more regions with different compositions. D composed of two or more different types of atoms or molecules that has constant composition. E none of the above

B

Which of the following is a homogeneous mixture? A trail mix B stainless steel C water D molten iron E none of the above

B

Which of the following items is a physical property? A the corrosive action of acid rain on granite B the odor of spearmint gum C the combustion of gasoline D the tarnishing of a copper statue E none of the above

B

In order, what is the freezing point, room temperature, and boiling point of water according to the Celsius scale? A 32-75-212 B 0-75-100 C 0-22-100 D 0-298-373 E none of the above

C

Physical properties are: A those that a substance displays only through changing its composition B those that cause atoms and molecules to change C those that a substance displays without changing its composition D identical for all solid matter E none of the above

C

Which of the following is a heterogeneous mixture? A milk B sugar water C raisin bran D air E none of the above

C

Which state of matter has indefinite shape and is compressible? A liquid B solid C gas D plasma E none of the above

C

A solution is an example of a (an): A pure substance B element C compound D homogeneous mixture E heterogeneous mixture

D

When methane is burned with oxygen the products are carbon dioxide and water. If you produce 36 grams of water and 44 grams of carbon dioxide from 16 grams of methane, how many grams of oxygen were needed for the reaction? A 32 B 80 C 96 D 64 E none of the above

D

Which type of energy is associate with motion? A chemical B electrical C potential D kinetic E none of the abo

D

Which state of matter has atomic spacing that is far apart and definite shape? A liquid B solid C gas D plasma E none of the above

E

A chemical change occurs when matter does not change its composition. True False

F

A melting scoop of ice cream is an example of an exothermic process. True False

F

In a chemical reaction, the substances present after the chemical change are called reactants. True False

F

When a cold ice cube is dropped into a warm cup of water, energy is transferred as heat from the ice to the water. True False

F

A Kelvin degree is the same size as a Celsius degree. True False

T

Gases are the only form of matter that is easily compressible. True False

T

The coldest temperature possible is 0 K. True False

T