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Gcse Science
Chemistry - Balancing Equations (Aqa)
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Q.1
How many atoms of hydrogen, sulfur and oxygen are there in sulfuric acid, formula H SO ?
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1, 1, 1
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2, 2, 4
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1, 1, 3
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2,1,4
Q.2
What non-metals are found in sodium silicate?
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Sodium and silicon
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Silicon and oxygen
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Sulfur and hydrogen
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Silicon and carbon
Q.3
What do their names tell you about sodium sulfide and sodium sulfate?
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Sodium sulfide is soluble in water, sodium sulfate is not
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Sodium sulfate is highly flammable, sodium sulfide is not
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Sodium sulfide is a solid, sodium sulfate is a gas
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Sodium sulfate has oxygen atoms joined to the sulfur atoms but sodium sulfide hasn't
Q.4
The main gas used in a stink bomb is the highly toxic hydrogen sulfide. What does this compound contain?
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Only hydrogen and sulfur
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Only hydrogen and sulfide
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Hydrogen, oxygen and sulfur
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Water and sulfur
Q.5
How many atoms of oxygen in this thermal decomposition - CaCO ⇌ CaO +CO
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1 on the left, 2 on the right
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1 on the left, 3 on the right
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3 on the left, 3 on the right
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3 on the left, 2 on the right
Q.6
You might find it easier to have a pen and paper handy for this and the rest of the questions. A student is balancing an equation that involves Na SO . She needs to have 6 atoms of sodium, how would she write this in her answer?
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3Na2SO4
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3(Na2SO4)
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Na6SO4
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None of the above
Q.7
Bill needs to balance an equation that involves aluminium oxide, formula Al O . He requires a total of 12 oxygen atoms to balance his equation. What should he write?
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12Al2O3
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Al2O12
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Al6O12
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4Al2O3
Q.8
Balance the equation Na + H O → NaOH + H .
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2Na + 2H2O → 2NaOH + H2
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Na + 2H2O → NaOH + H2
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2Na + H2O → 2NaOH + H2
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2Na + 2H2O → 2NaOH + 2H2
Q.9
Balance the equation for the reaction CuO + Al → Cu + Al O
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2CuO + Al → 2Cu + Al2O3
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3CuO + 2Al → 3Cu + Al2O3
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3CuO + 3Al → 3Cu + Al2O3
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CuO3 + Al2 → Cu + Al2O3
Q.10
In a blast furnace, there are several chemical reactions. The main one for smelting the iron from the iron ore is Fe O + CO → Fe + CO . Which numbers should be put in front of each formula in order to balance the equation?
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no number, 2, no number, 2
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3, 3, 2, 3
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2, 2, 3, no number
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no number, 3,2,3
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