Helen's science vocabulary

12 cards·by Melisssa

analysis

a type of chemical reaction where a compound is broken down into simpler products. Also called decompsition.l

Synthesis

a type of chemical reactionwhere two or more substances combine to make a more complex substance. ( things are put together)

Reactant

anything that goes into a chemical reaction

Product

anything that results (comes out of) a chemical reaction

Law of conservation of mass

matter is neither created or destoyed in a chemical reaction it only changes form

chemical equation

a representation of a chemical reaction using chemical symbols, chemical formulas and arrows

Indicator

a substance that indicates the presence of an acid or base (examples include: phenolthalein and PH paper)

replacement

a chemical reaction where one element replaces another element in a compound or where two elements in different compounds trade places.

Exothermic

a chemical reaction where heat it given off and feels hot

endothermic

a chemical reaction where heat is taken in and feels cold

Physical change

a change in matter that results in a change in form or appearance. No new substances are formed. (examples include phase changes)

chemical change

a change in matter that results in new substances being created. Atoms and molecules are rearranged.