

Yr 8- Revising chemical reactions
Presentation
•
Chemistry, Science
•
8th - 10th Grade
•
Practice Problem
•
Medium
Arunthathi Sankaran
Used 10+ times
FREE Resource
8 Slides • 16 Questions
1
Yr 8- Revising chemical reactions

2
Combustion
When fuels react with oxygen to release energy, it is a combustion reaction.
Combustion reactions produce Carbon Dioxide and Water.
3
Multiple Choice
Fuels burn to transfer
molecules
atoms
energy
temperature
4
Multiple Choice
Combustion is another word for
reaction
oxidation
decomposition
burning
5
Multiple Choice
When a fuel burn it reacts with
carbon dioxide
oxygen
water
hydrogen
6
7
Combustion experiment
Carbon dioxide and water is produced
Water is condensed in the U tube
This will turn cobalt chloride paper pink
Carbon dioxide turns lime water milky
8
Fill in the Blanks
The water is ----------------------- in the U tube
Type answer...
9
Fill in the Blanks
The carbon dioxide turns -------------------- milky
Type answer...
10
Multiple Choice
The cobalt chloride changes colour from
pink to blue
blue to pink
colourless to milky
milky to colourless
11
Multiple Choice
This is an example of -----------------
combustion
decomposition
displacement
oxidation
12
Thermal decomposition
When a chemical substance breaks down (decomposes) due to heat into at least two chemical substances.
13
Multiple Choice
This is an example of ------------------------------
combustion
decomposition
displacement
oxidation
14
Fill in the Blanks
When silver bromide decomposes it breaks down into 2 products :
Type answer...
15
Thermal decomposition of carbonates
Metals high up in the reactivity series - such as calcium - have carbonates that need a lot of energy to decompose them.
Metals low down in the reactivity series - such as copper - have carbonates that are easily decomposed.
16
Multiple Choice
Aluminium carbonate decomposes easily than iron carbonate
True
False
Difficult to say
17
Multiple Choice
At room temperature potassium carbonate decomposes into potassium oxide and carbon dioxide.
True
False
18
Multiple Choice
At room temperature copper carbonate decomposes into
copper and carbon dioxide
copper oxide and carbon oxide
copper dioxide and carbon dioxide
copper oxide and carbon dioxide
19
Multiple Choice
When copper carbonate CuCO3 is decomposed, it breaks into
Copper and carbon dioxide
Copper oxide and carbon dioxide
Copper oxide and carbon monoxide
Copper dioxide and carbon
20
21
Multiple Choice
Strontium is more stable to thermal decomposition than Calcium
False
True
Impossible to say
22
Multiple Choice
Calcium nitrate decomposes to form
Calcium oxide, nitrogen oxide and nitrogen
Calcium dioxide, nitrogen oxide and nitrogen
Calcium oxide, nitrogen dioxide and oxygen
Calcium dioxide, nitrogen dioxide and oxygen
23
Law of conservation of mass
Mass is never gained or lost in a chemical reaction.
When a reaction happens, the atoms in the chemicals are rearranged into different compounds. No new atoms are created and no atoms can disappear.
24
Multiple Choice
When 16 g of methane combines with 2 molecules of oxygen each weighing 32 g, we get 44 g of carbon dioxide and
1 molecule of 18 g of water
2 molecules of 18 g of water
1 molecule of 18 g carbon dioxide
2 molucules of 18 g of carbon dioxide
Yr 8- Revising chemical reactions

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