Thermal Decomposition & Precipitaion

Question 1

What is thermal decomposition?

Answer 1

Breaking down a substance with heat to make 2 or more other substances

Question 2

Give me examples of transition metal carbonates. (which break down on heating)

Answer 2

Copper(||) carbonate

Iron(||) carbonate

Zinc carbonate

Question 3

In what do transition metal carbonates break down?

Answer 3

They break down into metal oxides

Like -

Carbon dioxide
Copper oxide

Question 4

How do you know when a metal oxide and a transition metal carbonate reacted together?

Answer 4

The colour change

Thermal decomposition is the reaction here

Question 5

What is a precipitation reaction?

Answer 5

Where 2 solutions react and an insoluble solid forms

The solid is “precipitated out”

Question 6

What is the solid form in a precipitation reaction called?

Answer 6

A precipitate

Question 7

How is an insoluble hydroxide made?

Answer 7

A soluble transition metal compound reacting with sodium hydroxide

• copper(||) sulfate
• iron (||) sulfate
• iron (|||) sulfate

Question 8

Copper (||) hydroxide is a transition metal hydroxide, what colour does it give of when becoming what it is now?

Answer 8

Blue solid

Question 9

What is the word and symbol equation for iron(||) sulfate turning into iron(||) hydroxide?

Answer 9

Iron(||) sulfate +
sodium hydroxide

—–>

Iron(||) hydroxide + sodium sulphate

FeSO4 + 2NaOH –> Fe(OH)2 + NaSO4