Matter & Chemical Change Section 1 Review

chemical and physical stuff 😞

chemical change

change that results when two or more substances react to create a different substance or substances; the new substances have completely different properties from the original ones

physical change

change in the appearance or state of a substance that does not change the composition

states of matter

refers to the three common states in which matter can exist: solid, liquid, and gas

melting

change of state from a solid to a liquid

evaporation

change of state from a liquid to a gas

freezing

change of state from a liquid to a solid

condensation

change of state from a gas to a liquid

sublimation

change of state from a solid to a gas

deposition

change of state from a gas to a solid

physical properties

property that describes the physical appearance and composition of a substance

ductile

description of a solid that can be stretched into a long wire

solubility

mass of a substance that can dissolve in a given amount of solvent to form a saturated solution at a given temperature

density

amount of mass in a given volume of a substance

element

pure substance that cannot be broken down into other substances; substance made up of only one type of atom

conductivity

ability of a substance to conduct electricity or heat

mechanical mixture

heterogeneous mixture; mixture in which the different substances that make up the mixture are visible

pure substance

substance made of only one kind of matter, which has a unique set of properties

suspension

cloudy mixture in which tiny particles of one substance are held within another, and the particles can be separated out

compound

chemical combination of two or more elements in a specific ratio

solution

homogeneous mixture; mixture of two or more pure substances that looks like one substance

colloid

cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance

malleable

description of a substance that can be pounded or rolled into sheets

matter

Anything that has mass and takes up space

chemical property

description of how a substance interacts with other substances, such as acids; chemical properties are observable only when a chemical change occurs

evidence of chemical change

1. Color Change from within
2. Production of gas or odor
3. Release or absorption of heat
4. Production of light or sound
5. Total loss of identity

evidence of physical change

Evidence includes different shape, size, weight, length, or state or matter.

precipitate

A solid that forms from a solution during a chemical reaction.

Example of physical change

dissolving salt in water

Example of physical change

ice melting

Example of a chemical change

burning paper

Example of chemical change

adding a solid to a liquid and heat is produced.

Example of physical change

breaking chaulk into pieces

Example of chemical change

mixing two chemicals and a gas is produced

compressed gas

environmental hazard

toxic

biohazard

irritant

Exploding Bomb

health hazard

flammable

oxidizing

corrosive