Chemical Change Flashcards
physical properties
properties that you can either observe using your five senses — seeing, hearing, touching, smelling and tasting — or measure directly
chemical properties
properties that describe how a substance combines with other substances to form new chemicals or how a substance breaks up into two or more different substances
flammability
an indicator of how easily a substance catches fire
reactivity
a measure of how likely a particular metal is to take part in a displacement reaction
toxicity
the danger to your health caused when poisonous substances combine with chemicals in your body to produce new substances and damaging effects
chemical change
change that results in a new substance being formed. During a chemical change, some chemical bonds break and others form.
evaporates
change state from a liquid to a gas. Evaporation occurs only from the surface of a liquid.
state
condition or phase of a substance. The three main states of matter are solid, liquid and gas.
physical changes
change in which no new chemical substances are formed. A physical change may be a change in shape, size or state. Many physical changes are easy to reverse.
chemical reaction
a chemical change in which one or more new chemical substances are produced
reactants
chemical substance used up in a chemical reaction. Some chemical bonds in a reactant are broken during the reaction.
products
new chemical substance that results from a chemical reaction
precipitate
solid product of a chemical reaction that does not dissolve in water
reaction rate
speed at which a reaction takes place
