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