Chemistry Chapter 1 Test
it is easy to determine whether a substance is a metal if the substance is
a good electrical and heat conductor
a chemical change occurs when
a leaf changes color in the fall
an alloy such as a gold ring is an example of a ______ mixture
homogeneous
if a mixture is uniform in composition, it is said to be
homogeneous
metalloids are often
semiconductors
atom
the smallest unit of matter that maintains its chemical identity
a mixture is...
a blend of any two or more kinds of matter, as long as each maintains its own unique properties
mass
a measure of the quantity of matter
a homogeneous mixture is also called
a solution
compound
a substance, made of two or more atoms that are chemically bonded, that can be broken down into simpler, stable substances
which of the following is an example of a homogeneous mixture?
air
a solid substance is
always the same shape regardless of its container
two scientists are trying to determine the exact nature of the chemicals in a lava flow. they are working in the field of ______ chemistry
analytical
chemical
any substance that has a definite composition
plasma is the fourth state of matter. in the plasma state...
atoms lose electrons
a nonmetal is usually
brittle
which is not a physical change
burning
an apple turning brown after being cut is an example of a ____ change
chemical
any substance with a definite composition is a ____
chemical
iron and sulfur, when heated, form an iron sulfide that has different properties form either iron or sulfur. the formation of iron sulfide is an example of a _____ change
chemical
the study of matter and changes that occur in matter best describes the science of ______
chemistry
some iron and sulfur are mixed together, then heated. when the result is cooled, the iron can no longer be separated from the sulfur with a magnet. the result of heating the was the formation of a _____
compound
what is an intensive property of matter?
density
the two types of matter that are pure substances are _____ and _____
elements and compounds
matter that has neither a definite volume nor a definite shape is in the _____ state
gas
a physical change occurs when
glue gun melts a glue stick
which of the following is an example of a heterogeneous mixture?
granite
the vertical columns on the periodic table are called
groups
the liquid state of matter can be described as
having a definite volume but not a definite shape
gravel is an example of a ____ mixture
heterogeneous
if a mixture is not uniform throughout it is called
heterogeneous
a chemistry student is studying the formation of quartz crystals. she is studying _____ chemistry
inorganic
what happens to the energy in a substance when it changes state?
it changes form, but is neither destroyed nor increased
basic research is performed to increase _____
knowledge
a sample of matter can be poured from container to container. it takes the shape of its container but only takes up a certain volume. based on this information, the sample is in the ____ state
liquid
a state of matter in which a material has no definite shape but has a definite volume is the ____ state
liquid
the particles of a substance in the ______ are able to slide past each other
liquid
technological development often occurs....
long after the basis research is complete
a true statement about mass is that
mass is determined by comparing the mass of an object with a set of standard masses that are part of a balance
light
matter includes all of the following except
which is not a chemical change
melting
a scientist is working to develop better dating methods for substances that contain carbon. He is working in the field of _____ chemistry
organic
all known chemical elements are organized into groups based on similar chemical properties in the
periodic chart
the horizontal rows on the periodic table are called
periods
a scientist is working to determine the properties ad changes of matter and their relation to energy of a newly discovered mineral. She is working the the field of _____ chemistry
physical
the melting of butter is a ____ change because it does not produce any new substances
physical
when examining a mineral, hardness and color are two of the properties used for identification. hardness and color are examples of _____ properties
physical
applied research is often performed to find the answer to a particular ____
problem
in a bonfire, oxygen allows wood to combs, leaving behind ashes. in this process, oxygen and wood are reactants, and ashes are the _____
products
technological development is performed to better our _____
quality of life
the oxygen in air causes iron to ruse. iron and oxygen are _____ in this process, and rust is the product
reactants
applied research is carried out in order to...
solve a particular problem
two most important properties of all matter
taking up space and having mass
organic chemistry
the study of carbon-containing compounds
inorganic chemistry
the study of non-carbon related compounds
biochemistry
the study of the chemistry of living things
a scientist is using mathematical models to isolate a new chemical process. H sis working in the field of ______ chemistry
theoretical
basic research is usually performed...
to gain knowledge
noble gases are
unreactive
under ordinary conditions of temperate and pressure, the particles in a gas are
very far from one another
the only pure substance listed below
vitamin C (ascorbic acid)
what is an extensive property of matter?
volume