WorksheetsChemical reactions
Total questions: 41
Worksheet time: 21mins
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
Reactants
Yields
Products
Chemical Equation
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
Reactants
Yields
Products
Chemical Equation
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed.
TRUE
FALSE
Which statement is not a description of a chemical reaction?
A solid is dropped into a beaker of liquid and a gas is released.
A solid is dropped into a beaker of liquid and an explosion occurs.
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
A liquid is heated in the sun and half of it evaporates.
During a chemical reaction, atoms can
be destroyed to form a new substance
be created to form a new substance
be rearranged to form a new substance
Which law states that Matter cannot be created or destroyed?
Law of Conservation of Matter
Law of Gravity
Law of Equivalent Exchange
Law of Matter ad Infinitum
Al + O2 --> 2Al2O3
How many total atoms are in this compound? Al2O3
2
5
6
3
the starting materials in a chemical reaction are called what?
Products
Reactants
Starters
Enders
a substance that is formed as the result of a chemical reaction is called
Product
Reactant
Starters
Enders
Which chemical equation matches the model shown?
3C + 4O --> 3CO2
3C + 2O2 --> 3CO2
C3 + 4O --> 3CO6
C3 + 2O2 --> 3CO6
What colour is copper(II)carbonate
white
blue
colourless
green
copper(II)carbonate → ___________ + carbon dioxide
copper(I) oxide
copper(II) oxide
copper oxide
copper(III) oxide
What happens when CO2 is bubbled through limewater
It changes from pink to blue
It goes pop
It goes cloudy
It gets hot
What colour is copper (II) oxide
white
green
blue
black
______________ (+ heat) → zinc oxide + carbon dioxide
zinc carbonate
zinc oxide
zinc dioxide
zinc hydrogen carbonate
Metal Carbonate
Metal Oxide + Carbon
Metal Carbonate + Oxygen
Metal Oxide + Carbon Dioxide
Carbon Dioxide + Metal
8.7: Combustion is when a __________ reacts with oxygen
petrol
fuel
fire triangle
carbon dioxide
Which one of the following is not a fossil fuel?
Wood
Coal
Petrol
Natural Gas
Why do we burn a fuel?
To have fun
To release energy
To lose energy
To produce carbon dioxide
2Li + Cl2 -> LiCl
N2 +3 H2 --> 2NH3
Exothermic reactions are ones that.....
Release energy to the surroundings
Absorb energy from the surroundings
Remain at a constant temperature
Decrease in temperature
An example of an endothermic reaction is......
burning
neutralisation
thermal decomposition
metal and acid reactions
The initial temperature was measured to be 20oC and the final temperature was 10oC. The reaction was
exothermic
endothermic
The initial temperature was measured to be 20oC and the final temperature was 45oC. The reaction was
exothermic
endothermic
Which reaction is endothermic?
acid neutralising alkali causing a temperature increase
adding magnesium to hydrochloric acid
calcium carbonate decomposing when heated
combustion of fossil fuels
Which statements about exothermic and endothermic reactions are correct?
1 During an exothermic reaction, heat is given out.
2.The temperature of an endothermic reaction goes up because heat is taken in.
3.Burning methane in the air is an exothermic reaction.
All
1 and 2 only
1 and 3 only
2 and 3 only
Solutions of two chemicals are mixed. A reaction occurs and the temperature change is measured. Which statement is correct?
If the reaction is endothermic, the temperature decreases and energy is taken in.
If the reaction is endothermic, the temperature increases and energy is given out.
If the reaction is exothermic, the temperature decreases and energy is given out.
If the reaction is exothermic, the temperature increases and energy is taken in.
Some white anhydrous copper(II) sulfate powder is put into a beaker of water and stirred. What would show that the process was exothermic?
A blue solution is formed.
The beaker feels cooler.
The beaker feels warmer.
The powder dissolves in the water.
Which of these fuels are fossil fuels?
colal
oil
natural gas
hydrogen
Which of these fuels are non renewable?
coal
oil
natural gas
hydrogen
what observations are seen when sodium is placed in water
It floats
It moves around the surface of the water
fizzing
melts to a sphere
