Chemistry Test Practice
Which of the following is/are a characteristics of compounds? -- definite composition, combined physically, pure substance, heterogeneous, 1&3
1&3
Four liquids have the following densities A) 1.0 g/ml B) 0.8 g/ml C) 0.6 g/ml D)1.2 g/ml In what order would the liquids form layers from top to bottom if they were carefully placed in a container
CBAD
which is a mixture? -- nickel, air, oxygen, salt, none of these
air
which of the following mixtures is homogeneous? -- salt water, iron and sulfur, salt and sugar, stainless steel, all are homogeneous
all are homogeneous
which does not belong? -- boiling, melting, freezing, burning, none of these
burning
a new substance is formed as a result of a
chemical change
pure substances made of more than one element are called
compounds
an example of a chemical change is the -- corrosions of metals, freezing of milk, dissolving of sugar, none of these
corrosions of metals
lead ways 11.34 grams per cubic centimeter. this statement represents leads
density
air is a mixture because it -- is colorless, is odorless, does not have a inform composition, can be compressed
does not have a uniform composition
chemical changes always involve
either the absorption or liberation of energy
Which of the following is a chemical change? -- evaporation of water, distillation of water, freezing of water, electrolysis of water
electrolysis of water
which of the following is most likely to be malleable? -- gold, hydrogen, sulfur, radon, lead bromide
gold
A chemical change always results characteristically in a change of
identity
which of the following is true of a chemical and physical change but not nuclear change? -- irreversible mass conserved, change of color, formed in any proportions, exothermic
mass conserved
A material that is made up of more than one kind of atom -- cannot be a compound, an element, may be a mixture, must be a hydrate, none of these
may be a mixture
which of the following is a heterogeneous mixture? -- mayonnaise, sea water, pepsi, slat
mayonnaise
An example of an element is -- air, milk, mercury, slat, none of these
mercury
chemical changes differ from physical changes because in chemical changes
new substances are formed
when elements combine chemically they always form -- new elements, atoms, gases, mixtures, none of these
none of these
three different observers measure the melting temperature of a substance and agree on the same value, but the value they obtain does not agree with the accepted value. their measurements can be described as
precise but not accurate
solids differ from liquids in that only samples of solids normally have definite
shapes
one physical property of sugar is its
solubility
which of the following is not a chemical change? -- the dissolving of zinc by HC1, the exploding of gasoline, the corroding of a copper roof, the boiling of water
the boiling of water
which is an element? -- zinc, hydrochloric acid, salt, water, 1&3
zinc