Chemical changes Flashcards
1
Q
What is a redox reaction?
A
when one substance is reduced and another is oxidised
2
Q
What is produced when an acid is reacted with some metals?
A
salt and hydrogen
3
Q
What do acids produce in aqueous solutions?
A
H+ ions
4
Q
How can the ph scale be measured?
A
using univeral indicator of a pH probe
5
Q
what is pH 7?
A
neutral
6
Q
what is pH < 7
A
acidic
7
Q
what is pH > 7
A
alkaline
8
Q
what is the ionic equation for any neutralisation reaction?
A
H+ (aq) + OH- (aq) —> H20 (l)
9
Q
Titrations:
A
the volumes of acid and alkali solutions that react with each other can be measured by titration using a suitable indicator.
