Font size
WorksheetsChemical Reaction (8th grade)
Total questions: 36
Worksheet time: 36mins
In an endothermic reaction, heat is
Absorbed
Released
In an exothermic reaction, heat is
Absorbed
Released
In an endothermic reaction, the temperature of the surrounding environment will
Increase
Decrease
n an exothermic reaction, the temperature of the surrounding environment will
Increase
Decrease
What is meant by physical change?
A new chemical substance is formed
Change in the state of matter
What is meant by chemical change?
A new chemical substance is formed
The change in the state of matter
What is the chemical reaction for RUSTING?
Metal + Oxygen -> metal oxide
Iron + Oxygen --> Carbon dioxide + water
Iron + Oxygen --> Iron oxide
Lithium + Oxygen -> Lithium oxide
Which of these reactions means "reacting with oxygen"?
Burning
Oxidation
Rusting
Corrosion
Methane (CH4) is burned, what are the products?
Methane oxide
Carbon dioxide
Water
Oxygen
__________ + _________ --> Magnesium Oxide. Tick all the reactants
Magnesium
Metal
Water
Oxygen
When LITHIUM is placed in HYDROCHLORIC ACID, what will be produced?
Lithium chloride
Carbon dioxide
Water
Lithium oxide
Beryllium + Nitric acid -->
Water
Hydrogen
Beryllium oxide
Beryllium nitrate
__________ + Hydrochloric acid --> Potassium chloride + Water
Potassium carbonate
Potassium
Potassium hydroxide
Potassium oxide
________ + Sulfuric acid --> Magnesium sulfate + hydrogen
Magnesium
Magnesium hydroxide
Magnesium carbonate
Magnesium oxide
Sodium carbonate + _________ --> Sodium actetate + Water + Carbon dioxide
Acetate acid
Acetate
Acetic acid
Acetic
_________ + Hydrochloric acid --> Rubidium chloride + Water + Carbon dioxide
Rubidium
Rubidium oxide
Rubidium hydroxide
Rubidium carbonate
Lithium carbonate + Ethanoic acid -->
Hydrogen
Water
Carbon dioxide
Lithium ethanoate
Calcium hydroxide + Ethanoic acid -->
Water
Hydrogen
Calcium ethanoic
Calcium ethanoate
Water
Hydrogen
Calcium ethanoic
Calcium ethanoate
The name of the theory where mass is never lost in a chemical reaction is called?
Water electrolysis
Neutralization
Conservation off mass
Carbonation of acids
The name of the process where the hydrogen and oxygen ions in water are separated?
Water electrolysis
Neutralization
Conservation off mass
Carbonation of acids
What are the two substances needed for rusting to happen?
Oxygen
Nitrogen
Salt
Water
Which of these elements is the MOST REACTIVE with water?
lithium
silver
gold
copper
lithium
silver
gold
copper
Which of these elements is the LEAST REACTIVE with water?
lithium
silver
gold
copper
lithium
silver
gold
copper
Which of these elements is the MOST REACTIVE with oxygen?
copper
zinc
iron
lead
Which of these elements is the LEAST REACTIVE with oxygen?
copper
zinc
iron
lead
Which of these elements is the MOST REACTIVE with acid?
magnesium
iron
aluminium
zinc
Which of these elements is the LEAST REACTIVE with acid?
magnesium
iron
aluminium
zinc
Which are ways to prevent rusting?
painting
galvanising
oiling
plastic coating
Which elements can be used to "sacrificially protect" iron from rusting?
zinc
copper
lead
magnesium
Magnesium + Water -->
Magnesium
Magnesium oxide
Hydrogen
Magnesium hydroxide
_________ + Water --> Rubidium hydroxide + Hydrogen
Rubidium oxide
Rubidium
Rubidium hydrogen
Rubidium hydroxide
Will this displacement reaction take place or no? Calcium + Magnesium Oxide -->
Yes
No
Will this displacement reaction take place or no? Iron nitrate + Lead -->
Yes
No
Will this displacement reaction take place or no? Magnesium ethanoate + copper -->
Yes
No
Aluminium hydroxide + Citric acid -->
Hydrogen
Water
Aluminium citrate
Aluminium citric
Aluminium hydroxide + Citric acid -->
Hydrogen
Water
Aluminium citrate
Aluminium citric
