Unit 4 - Explaining Chemical Changes 2 Flashcards
Acid reactions & combustion
a process in which one or more substances are changed into others by their atoms being rearranged
chemical reaction
the substance formed when an acid reacts with a base
salt
the atom present in all acids
hydrogen
how reactive a substance is
reactivity
a type of compound containing carbon and oxygen
carbonate
the gas in the air used by plants to make food. It is produced during respiration, by burning fossil fuels or by acids reacting with metal carbonates.
carbon dioxide
a solution used to test for the presence of carbon dioxide
limewater
disruption of the digestion process often resulting in too much acid being produced
indigestion
when acid from the stomach irritates the upper digestive tract
heartburn
a substance that neutralises stomach acid
antacid
a substance that neutralises an acid
base
when an acid and a base react to form a salt and water and the resulting product has pH 7
neutralisation
a chemical put on soil to increase soil fertility and allow better growth of crop plants
fertiliser
a common idea that people share that is inaccurate
misconception
a material that is burned to release its energy
fuel
the process of burning
combustion
a model to show the three things needed for a fire – heat, fuel and oxygen
fire triangle
a chemical reaction in which heat energy is given out
exothermic
something has energy if it has the ability to make something happen when the energy is transferred
energy
a liquid chemical such as ethanol which can be used as a biofuel
alcohol
is produced when sulphur is oxidised during the combustion of some fossil fuels and is one of the main gases that produces acid rain
sulphur dioxide
rainwater that is made acidic by pollutant gases e.g. sulphur dioxide
acid rain
