Chemical Reactions Flashcards
(18 cards)
Balanced symbol equation
This equation shows how atoms are rearranged and gives relative amounts of products and reactants.
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 light and heat.
Conversation of mass
In a chemical reaction, the total mass of reactants is equal to the
total mass of products. This is conservation of mass. Mass is
conserved in chemical reactions and in physical changes
Decomposition
A chemical reaction in which a compound breaks down to form simpler compounds or elements.
Discrete
A variable that can only have whole number values.
Endothermic change
It can transfer energy from all its surroundings.
Exothemic change
Changes energy from surroundings.
Fossil fuel
A fuel made from the remains of animals and plants that died
millions of years ago. Fossil fuels include coal, oil, and natural gas.
Fuel
A material that burns to transfer useful energy
Hazard
A possible source of danger
Non-renewable
Some fuels are non-renewable. They form over millions of years, and will one day run out.
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 changes include changes of state, and dissolving
Product
A substance that is made in a chemical reaction
Reactant
A starting substance in a chemical reaction
Risk
The chance of injury or damage from hazard
Word equation
A way of representing a chemical reaction simply. The reactants are
on the lefts of an arrow, and the products are on the right.
