acids, bases Flashcards
1
Q
physical change
A
no new material formed
usually easy to reverse
2
Q
chemical change
A
new materials produced
difficult to reverse
3
Q
litmus
A
acid- red
alkaline- blue
4
Q
phenolphthalein
A
acid- colourless
alkaline- pink
5
Q
methyl orange
A
acid- red
alkaline- yellow
6
Q
acid + alkali —>
A
salt + water
7
Q
neutralisation
A
when alkali is added to acid, acid loses properties and becomes neutral
8
Q
acid + metal —>
A
salt + hydrogen
9
Q
acid + base —>
A
salt + water
10
Q
acid + carbonate —>
A
salt + water + carbon dioxide
