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Elementary School: 3rd, 4th & 5th Grade
Science
Reactions, Equations And Formulae
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Q.1
In the following reaction which are the products Mg + 2HCl → H + MgCl ?
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Hydrochloric acid and magnesium chloride
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Hydrogen and magnesium chloride
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Magnesium and hydrochloric acid
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Magnesium and hydrogen
Q.2
2H SO means 2 molecules of sulphuric acid. They contain .......
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2 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
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4 hydrogen atoms, 1 sulfur atom, 4 oxygen atoms
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4 hydrogen atoms, 2 sulfur atoms, 8 oxygen atoms
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4 hydrogen atoms, 4 sulfur atoms, 8 oxygen atoms
Q.3
When zinc carbonate reacts with dilute hydrochloric acid the products are .......
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carbon dioxide, water
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zinc chloride, carbon dioxide
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zinc chloride, carbon dioxide, water
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zinc sulfate, carbon dioxide, water
Q.4
The formula for potassium nitrate is KNO . This means .......
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1 potassium atom, 1 nitrogen atom, 3 oxygen atoms
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1 potassium atom, 3 nitrogen atoms, 3 oxygen atoms
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3 potassium atoms, 3 nitrogen atoms, 3 oxygen atoms
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3 potassium atoms, 3 nitrogen atoms, 9 oxygen atoms
Q.5
Which of the following is the correct balanced equation?
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2 Cu + O2 → Cu2O2
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2 Cu + O2 → 2 CuO
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Cu + O → CuO
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Cu + O2 → CuO2
Q.6
Which of the following metals do NOT react with water or steam?
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Aluminium
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Copper
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Tin
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Zinc
Q.7
The formula for calcium hydroxide is Ca(OH) . This means .......
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1 calcium atom, 1 oxygen atom, 2 hydrogen atoms
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1 calcium atom, 2 oxygen atoms, 1 hydrogen atom
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1 calcium atom, 2 oxygen atoms, 2 hydrogen atoms
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2 calcium atoms, 2 oxygen atoms, 2 hydrogen atoms
Q.8
The formula for copper nitrate is Cu(NO ) . This means .......
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1 copper atom, 1 nitrogen atom, 6 oxygen atoms
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1 copper atom, 2 nitrogen atoms, 3 oxygen atoms
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1 copper atom, 2 nitrogen atoms, 6 oxygen atoms
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2 copper atoms, 2 nitrogen atoms, 6 oxygen atoms
Q.9
Which of the following metals is the most reactive with acids?
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Aluminium
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Iron
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Magnesium
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Zinc
Q.10
During a chemical reaction new substances are formed from old ones. Which of the following is NOT true?
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New substances can be changed back to the original ones
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The total mass of products = total mass of reactants
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There is often a color change
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There is often a temperature change
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