distillation
a process in which a liquid is boiled to produce a vapor that is condensed again into a liquid
mass
amount of matter an object contains
chemical reaction
process in which substances are changed inro different substances
compound
composed of two or more substances chemically combined in a fixed proportion
element
substance that cannot be changed into simpler substances by chemical means
homogeneous
describes mixture with a uniform composition
organic chemistry
the study of all chemicals containing carbon
inorganic chemistry
the study of chemicals that, in general, do not contain carbon
biochemistry
the study of the processes that take place in organisms
analytical chemistry
the study of the composition of matter
physical chemistry
concerned with the mechanism, rate, and energy transfer that occurs when matter undergoes a chnage
chemistry
the field of science that studies the composition and structure of matter
what must occur for a change to be a chemical reaction?
there must be a change in chemical properties
which step in the scientific method requires you to use your senses to obtain information?
making an observation
when paper turns yellow-brown upon exposure to sunlight, what type of change is likley taking place?
a chemical change
a chemical change occurs when a piece of wood___
rots
what is on difference between a mixture and a compound?
a compound can only be seperated into its components by chemical means
The variable that is observed during an experiment is called what type of variable?
independent
an example of an extensive property of matter is __
mass
what must occur for a change to be a chemical reaction?
there must be a change in chemical properties