Chemical Equations- Key Words Flashcards
balanced symbol equation
in a balanced symbol equation, chemical formulae represents the reactants and products. the relative amounts of reactants and products are shown
chemical reaction
a change in which atoms are rearranged to create new substances
combustion
a chemical reaction in which a substance reacts quickly with oxygen and gives out light and heat
conservation of mass
in a chemical reaction, the total mass of reactants is equal to the total mass of products. mass is conserved in chemical reactions and in physical changes
decomposition
a chemical reaction in which a compound breaks down to form simpler compounds and/or elements
displacement
when a metal takes the place of a less reactive metal in a compound
endothermic reaction
takes energy from the surroundings
exothermic reaction
releases energy to the surroundings
fuel
a material that is burnt for energy (usually heat)
hazard
a possible source of danger
neutralisation
when an acid and base (alkali) react together to changing the pH of a mixture
oxidation
a chemical reaction in which substances react with oxygen to form oxides
physical change
a change that is reversible, in which new substances are not made. examples of physical change include changes of state and dissolving
product
a substance that is made in a chemical reaction
reactant
a starting substance in a chemical reaction
