chemical changes Flashcards
1
Q
complete this word equation
copper oxide + ? acid = copper sulfate + water
A
sulfuric acid
2
Q
what is the PH for acid
A
1
3
Q
why is acid heated?
A
to speed up the reaction
4
Q
after the reaction is complete, some solid copper remains why?
A
because the acid neutralised
5
Q
name a method that can be used to change calcium chloride solution into solid calcium chloride
A
crystallisation
6
Q
why can the formation of calcium atoms be described as oxidation
A
electrons are lost
