Unit 4 - Explaining Chemical Changes 1 Flashcards Preview

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Flashcards in Unit 4 - Explaining Chemical Changes 1 Deck (21)
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1
Q

a substance that has a pH lower than 7

A

acid

2
Q

a substance which reacts with materials and makes them dissolve

A

corrosive

3
Q

something that reddens the skin

A

irritant

4
Q

the atom present in all acids

A

hydrogen

5
Q

a soluble base that has a pH higher than 7

A

alkali

6
Q

the effect produced when an alkali is added to water

A

soapy

7
Q

the particle present in alkalis

A

hydroxide

8
Q

a dye that can change colour when placed in environments with different pH values

A

indicator

9
Q

an indicator which tells us if something is an acid or an alkali

A

litmus

10
Q

when a substance is neither acidic nor alkaline

A

neutral

11
Q

contains a lot of hydrogen ions / particles (acid) or a lot of hydroxide ions / particles (alkali)

A

strong acid/alkali

12
Q

contains only a few hydrogen particles / ions (acid) or a lot of hydroxide particles / ions (alkali)

A

weak acid / alkali

13
Q

a mixture of dyes which create a range of colour depending on the strength of acidity or alkalinity being tested

A

universal indicator

14
Q

the scale from 1-14 which shows acidity or alkalinity

A

pH number

15
Q

when an acid and alkali combine resulting in products with pH 7

A

neutralisation

16
Q

a laboratory method allowing accurate volumes of liquids to be measured

A

titration

17
Q

a molecule of water contains 2 hydrogen atoms and one oxygen atom

A

water

18
Q

when a substance is neither acidic nor alkaline

A

neutral

19
Q

a substance formed when an acid reacts with a base

A

salt

20
Q

a way of summarising a chemical reaction with the reactants on the left of the arrow and the products on the right

A

equation

21
Q

something which neutralises an acid

A

base