Lesson 4.3.1.1
4.3.1.1 Conservation of mass and balanced chemical equations Quiz: AQA Chemistry, Unit 3
20 questions
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Lesson 4.3.1.1, Conservation of mass and balanced chemical equations: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 3: Quantitative chemistry, written with Revision Ninja.
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The 20 questions
-
What does the law of conservation of mass state about atoms?
- No atoms lost
- Atoms are doubled
- Atoms are created
- Atoms are destroyed
-
In any closed chemical reaction, how do total masses compare?
- Products equal reactants
- Products exceed reactants
- Reactants exceed products
- Mass becomes zero
-
What must be equal on both sides of a balanced symbol equation?
- Volume of gases
- Total mass of reactants
- Number of molecules
- Number of each atom
-
Where is a multiplier placed in a chemical equation?
- Before formula
- As subscript
- Above arrow
- After formula
-
What does a subscript indicate within a chemical formula?
- Total mass
- Number of atoms
- State of matter
- Charge of ion
-
Balance this equation: H2 + O2 -> H2O.
- 2H2 + O2 -> 2H2O
- 2H2 + 2O2 -> H2O
- H2 + 2O2 -> H2O
- H2 + O2 -> H2O
-
Balance this equation: Mg + HCl -> MgCl2 + H2.
- 2Mg + HCl -> MgCl2 + H2
- Mg + 2HCl -> MgCl + H2
- Mg + HCl -> MgCl2 + H2
- Mg + 2HCl -> MgCl2 + H2
-
When carbon burns in oxygen, how do the total masses compare?
- Mass products are greater
- Total mass always decreases
- Mass products equal reactants
- Mass products are smaller
-
In 2CO + O2 -> 2CO2, how many oxygen atoms are on the left side?
- 6
- 2
- 4
- 3
-
Which balanced equation fits C2H6 + O2 -> CO2 + H2O?
- 2C2H6 + 6O2 -> 4CO2 + 6H2O
- C2H6 + O2 -> CO2 + H2O
- 2C2H6 + 7O2 -> 4CO2 + 6H2O
- C2H6 + 3O2 -> 2CO2 + 3H2O
-
Which equation is balanced?
- 2Na + 2H2O -> 2NaOH + H2
- Na + 2H2O -> NaOH + H2
- Na + H2O -> NaOH + H2
- 2Na + H2O -> 2NaOH + H2
-
In C6H12O6 + 6O2 -> 6CO2 + 6H2O, how many carbon atoms are in the products?
- 1
- 18
- 6
- 12
-
What do symbol equations use to represent chemical reactions?
- Physical states only
- Chemical formulae
- Energy levels
- Word descriptions
-
What does a front multiplier in a chemical equation apply to?
- Product mass only
- Only first element
- Only the subscript
- Every atom
-
Which balanced equation shows iron burning in oxygen to form iron(III) oxide?
- 2Fe + O2 -> Fe2O3
- Fe + O2 -> Fe2O3
- 2Fe + 3O2 -> Fe2O3
- 4Fe + 3O2 -> 2Fe2O3
-
In the thermal decomposition equation CaCO3 -> CaO + CO2, what is its status?
- Already balanced
- Needs a 3 before CO2
- Needs a 2 before CaCO3
- Needs a 2 before CaO
-
Which law is the basis for balancing equations?
- Conservation of energy
- Conservation of charge
- Conservation of volume
- Conservation of mass
-
Why must subscripts never be altered when balancing equations?
- Changes the substance
- Violates atomic mass
- Changes equation colour
- Alters reaction temperature
-
Which equation is balanced for aluminium burning in oxygen?
- 4Al + 3O2 -> 2Al2O3
- 2Al + 3O2 -> Al2O3
- 2Al + O2 -> Al2O3
- Al + O2 -> Al2O3
-
How many atoms are in 2H2O?
- 2
- 3
- 6
- 4
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