Science 10
Balancing Chemical Equations Worksheet #1
Balancing Equations Worksheet #1
A. Write word equations for the following:
Example:
Iron reacts with oxygen in the air to form rust (iron oxide)
iron(s) + oxygen(g) → iron oxide(s)
1. When zinc metal and sulfur powder are heated, they form solid zinc sulfide.
2. When octane is burned in an excess of oxygen, carbon dioxide and water vapor
produced.
3.When a solution of table salt and a solution of silver nitrate are mixed together, white
particles of silver chloride are formed in a solution of sodium nitrate.
4. Zinc metal plus oxygen gas produces solid zinc oxide.
5. When sodium metal is placed in a beaker of water, hydrogen gas and sodium
hydroxide solution are formed.
6. When zinc metal is placed in a solution of hydrochloric acid, hydrogen gas and a zinc
chloride solution are formed.
7. Methane combines with oxygen to produce water and carbon dioxide.
Science 10
Chemical Equations
8. Hydrochloric acid is poured over some marble chips (calcium carbonate) producing
bubbling carbon dioxide gas and water.
9. A solution of hydrochloric acid reacts with a solid calcium carbonate to produce
water, carbon dioxide and calcium chloride.
10. Calcium metal reacts with water to form calcium hydroxide and hydrogen gas.
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Science 10
Chemical Equations
Science 10
Balancing Chemical Equations Worksheet #1 – Answer Key
Balancing Equations Worksheet #1
A. Write word equations for the following:
Example:
Iron reacts with oxygen in the air to form rust (iron oxide)
iron (s)+ oxygen(g)
→
iron oxide (s)
1. When zinc metal and sulfur powder are heated, they form solid zinc sulfide.
zinc(s) + sulfur(s) + heat → zinc sulfide(s)
2. When octane is burned in an excess of oxygen, carbon dioxide and water vapor
produced.
octane(l) + oxygen(g) → carbon dioxide(g) + water(l)
3.Sometimes carbon dioxide can be made to react with hydrogen gas to produce
methane and water vapour
carbon dioxide(g) + hydrogen(g) → methane(g) + water(g)
4. Zinc metal plus oxygen gas produces solid zinc oxide.
zinc(s) + oxygen(g) → zinc oxide(s)
5. When sodium metal is placed in a beaker of water, hydrogen gas and sodium
hydroxide solution are formed.
sodium(s) + water(l) → hydrogen(g) + sodium hydroxide(l)
6. When zinc metal is placed in a solution of hydrochloric acid, hydrogen gas and a zinc
chloride solution are formed.
zinc(s) + hydrochloric acid(l) → hydrogen(g) + zinc chloride(l)
7. Methane combines with oxygen to produce water and carbon dioxide.
methane(g) + oxygen(g) → water(l) + carbon dioxide (g)
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Science 10
Chemical Equations
8. Sometimes acids can be heated and change into water and gases, such as: sulfuric
acids break down into water and sulfur trioxide gas.
sulfuric acid(g) → water(l) + sulfur trioxide(g)
9. A solution of hydrochloric acid reacts with a solid calcium carbonate to produce
water, carbon dioxide and calcium chloride.
hydrochloric acid(l) + calcium carbonate(s) → water(l) + carbon dioxide(g) + calcium chloride(s)
10. Calcium metal reacts with water to form calcium hydroxide and hydrogen gas.
calcium(s) + water(l) → calcium hydroxide(l) + hydrogen(g)
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