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Acids and Alkalis Key Terms
KS3 Acids and Alkalis Key Terms Review
18
Science
7th Grade
03/28/2009

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Term
neutralise
Definition
When an acid is added to a base (or alkali) a neutral substance is produced.
Term
acetic acid
Definition
The old name for ethanoic acid. It is the acid in vinegar.
Term
acid
Definition
A substance that turns litmus red. It has a pH of less than 7.
Term
ascorbic acid
Definition
Chemical name for vitamin C.
Term
citric acid
Definition
The acid in citrus fruits.
Term
ethanoic acid
Definition
The acid in vinegar.
Term
gas
Definition
Something made of particles that are very spread out and have no bonds between them.
Term
sweetener
Definition
A substance that makes things taste sweeter. Sugar is a natural sweetener.
Term
alkali
Definition
Substance that turns litmus blue. Has a pH of more than 7.
Term
indicator
Definition
A dye that will change colour in acids and alkalis.
Term
litmus
Definition
A simple kind of indicator. It turns red in acids and blue in alkalis.
Term
neutral
Definition
Substance that is not an acid or an alkali. Has a pH of 7.
Term
antacid
Definition
A medicine containing an alkali used to cancel out some of the acid in the stomach to treat heartburn.
Term
pH scale
Definition
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.
Term
universal indicator
Definition
A mixture of indicators giving a different colour depending on how weak or strong an acid or alkali is.
Term
burette
Definition
A tube with a tap at the bottom and a measuring scale on its side. Used to add a measured quantity of a liquid to another one.
Term
dilute
Definition
We dilute a solution by adding more of the solvent to it.
Term
neutralisation
Definition
When something is neutralised.
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