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7E Reactions

Simple chemical reactions @ AJHS NZ

QuestionAnswer
acetic acid The old name for ethanoic acid. It is the acid in vinegar.
acid rain Rain containing sulphuric and nitric acid.
acid A substance that turns litmus red. It has a pH of less than 7.
alkali Substance that turns litmus blue. Has a pH of more than 7.
antacid A medicine containing an alkali used to cancel out some of the acid in the stomach to treat heartburn.
ascorbic acid Chemical name for vitamin C.
carbon dioxide A gas which will put out a lighted splint and turn limewater milky.
chemical energy The kind of energy stored in chemicals.
chemical reaction A change where new substances are formed.
citric acid The acid in citrus fruits.
combination reaction When chemicals join to form new substances.
combustion The scientific word for burning.
corrosion When stone or metal reacts with chemicals in air or water and is worn away or changed into a different substance.
corrosive Substances that attack metals, stonework and skin are called corrosive.
dilute We dilute a solution by adding more of the solvent to it.
ethanoic acid The acid in vinegar.
fuel A chemical that can release energy when it reacts.
gas Something made of particles that are very spread out and have no bonds between them.
harmful Another word for irritant.
hydrocarbon A chemical compound containing only hydrogen and carbon.
hydrochloric acid A common acid that is also found in your stomach.
hydrogen A gas which is given off when metals react with acids. It burns with a squeaky pop.
indicator A dye that will change colour in acids and alkalis.
irreversible action A reaction in which what you end up with cannot be turned back into what you started with.
irreversible change Permanent change.
irritant Something that irritates the skin and eyes.
limewater A chemical that goes cloudy when carbon dioxide is bubbled through it.
litmus A simple kind of indicator. It turns red in acids and blue in alkalis.
neutral Substance that is not an acid or an alkali. Has a pH of 7.
neutralisation When something is neutralised.
neutralise When an acid is added to a base (or alkali) a neutral substance is produced.
nitric acid A common acid.
oxide A compound that includes oxygen.
permanent change A change in which what you ended up with cannot be turned back into what you started with.
pH scale A numbered scale from 1–14 showing the strengths of acids and alkalis. Numbers below 7 are acids. Numbers above 7 are alkalis. pH 7 is neutral.
physical change A change where no new substances are formed.
product New chemical formed in a chemical reaction.
reactants Chemicals that join together to form a new substance.
reversible change A change in which what you end up with can easily be turned back into what you started with.
rust Substance formed when iron or steel reacts with oxygen and water.
sulphuric acid A common acid. Used in car batteries.
sweetener A substance that makes things taste sweeter. Sugar is a natural sweetener.
universal indicator A mixture of indicators giving a different colour depending on how weak or strong an acid or alkali is.
word equation A way of writing out what happens in a chemical reaction.
Created by: johncl