Lesson T4.1.2
T4.1.2 Word and symbol equations Quiz: KS3 Chemistry, Unit 4
20 questions
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Lesson T4.1.2, Word and symbol equations: 20 multiple choice questions for the KS3 Chemistry (National Curriculum), Unit 4: Chemical reactions, written with Revision Ninja.
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The 20 questions
-
What does the arrow mean in a word equation?
- Melts down
- Reacts to form
- Evaporates away
- Dissolves fully
-
In the word equation magnesium + oxygen -> magnesium oxide, which is the product?
- Magnesium and oxygen
- Magnesium oxide
- Oxygen
- Magnesium
-
In the word equation hydrogen + oxygen -> water, what are the reactants?
- Water only
- Water and oxygen
- Hydrogen and oxygen
- Hydrogen only
-
Which symbol equation is correct for hydrogen gas and oxygen gas reacting to form water?
- H2 + O -> H2O
- H2 + O2 -> H2O
- 2H2 + O2 -> 2H2O
- 2H + 2O -> H2O2
-
How many hydrogen atoms are on each side of the balanced equation 2H2 + O2 -> 2H2O?
- Two
- Six
- Eight
- Four
-
In the symbol equation 2Mg + O2 -> 2MgO, how many magnesium atoms are on the right?
- Three
- One
- Two
- Four
-
What is the state symbol for a gas?
- (l)
- (g)
- (aq)
- (s)
-
What state symbol shows a solid?
- (l)
- (g)
- (aq)
- (s)
-
What are the products when iron reacts with sulfur?
- Iron sulfite
- Iron sulfate
- Iron sulfide
- Iron oxide
-
Which symbol equation shows a balanced reaction of carbon and oxygen to make carbon dioxide?
- C + O2 -> CO2
- C + O -> CO2
- C + 2O -> C2O2
- C2 + O2 -> CO2
-
Where are reactants placed in a correct word equation?
- Left side
- Bottom line
- Right side
- Top line
-
What does a coefficient in front of a chemical formula show?
- Atomic mass
- Number of units
- State of matter
- Number of bonds
-
What does a subscript number in a chemical formula show?
- Number of molecules
- Total mass
- Number of atoms
- Reactant count
-
A student wrote 2H2 + O2 -> H2O. Which correction makes it balanced?
- H2 + O2 -> 2H2O
- 2H2 + O2 -> 2H2O
- 2H2 + 2O2 -> H2O
- H2 + O -> H2O
-
What is the reactant when copper carbonate thermally decomposes into copper oxide and carbon dioxide?
- Copper
- Copper carbonate
- Copper oxide
- Carbon dioxide
-
Which set of coefficients balances N2 + H2 -> NH3, in the order N2, H2, NH3?
- 1, 2, 3
- 1, 3, 2
- 1, 1, 1
- 2, 3, 1
-
What is the symbol equation for magnesium reacting with hydrochloric acid to give magnesium chloride and hydrogen?
- Mg + HCl2 -> MgCl2 + H
- Mg + 2HCl -> MgCl2 + H2
- Mg + HCl -> MgCl + H2
- Mg + 2HCl -> MgCl2 + 2H2
-
Why must symbol equations have equal numbers of each atom on both sides?
- Volume is doubled
- Energy is lost
- Atoms are conserved
- Mass is created
-
What do the state symbols (aq) indicate in a chemical equation?
- An aqueous gas
- A solid precipitate
- Dissolved in water
- A pure liquid
-
Which equation is balanced for the combustion of methane (CH4) with oxygen to give carbon dioxide and water?
- CH4 + 2O2 -> CO2 + H2O
- CH4 + 2O2 -> CO2 + 2H2O
- CH4 + O2 -> CO2 + 2H2O
- CH4 + O2 -> CO2 + H2O
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