Chemistry test practice questions
what is one difference between a mixture and a compound?
a compound can only be separated by chemical means
a solution has a uniform composition
always true
an element is the simplest form of matter that has a unique set of properties
always true
compounds are represented by chemical formulas
always true
process in which substances are changed into different substances
chemical reaction
*table salt=
compound
composed of two or more substances chemically combined in a fixed proportion
compound
sucrose=
compound
water=
compound
a golf ball has more mass than a tennis ball because it__
contains more matter
a process in which a liquid is boiled to produce a vapor that is condensed against into a liquid
distillation
gold=
element
oxygen=
element
substance that cannot be changed into simpler substance by chemical means
element
which state of matter takes both the shape and volume of its container?
gas
describes mixture with a uniform composition
homogenous mixture
what is a solution?
homogenous mixture composed of only one phase. a solute is dissolved in a solvent
which state of matter is characterized by having an indefinite shape, but a definite volume?
liquid
amount of matter an object contains
mass
what happens to matter during a chemical reaction?
matter is neither created nor destroyed
what is a substance?
matter that has a specific composition and specific properties
a physical blend if two or more components
mixture
hot tea
mixture (homo)
vinegar
mixture (homo)
what distinguishes a substance from a mixture?
mixtures can be separated physically, while compounds cannot
compounds can be broken down into elements by physical means
never true
part of a sample having uniform composition and properties
phase
a substance that formed a chemical reaction
product
a heterogenous mixture contains two or more phases
sometimes true
heating a chemical compound produces elements
sometimes true
homogeneous mixtures can be separated be distillation
sometimes true
solutions are liquids
sometimes true
an example of a homogenous mixture is___
stainless steel
table sugar (sucrose)
substance (compound)
table salt (NaCl)
substance (homo)
what must occur for a change to be a chemical reaction?
there must be a change in chemical properties
what is true about homogenous mixtures?
they are known as solutions
what is true about compounds?
they are substances
gaseous state of substance that is a liquid at solid room temp.
vapor
