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Chemistry - Word Equations
Sugar → carbon dioxide + ethanol. This is the word equation for fermentation, the process by which beer and wine are made.

Chemistry - Word Equations

This Chemistry quiz is called 'Chemistry - Word Equations' and it has been written by teachers to help you if you are studying the subject at high school. Playing educational quizzes is a user-friendly way to learn if you are in the 9th or 10th grade - aged 14 to 16.

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It is necessary for high school Science students to have a basic grasp of the fundamental ideas in chemistry. This quiz looks specifically at word equations - the method of writing down chemical reactions in words rather than in symbols.

1.
What is the missing chemical in the word equation:

sugar → carbon dioxide + _______
Methane
Ethane
Methanol
Ethanol
You should recognize this as being the word equation for fermentation
2.
Which of the following is the correct word equation for the reaction between magnesium carbonate and an acid?
magnesium carbonate + sulfuric acid → magnesium sulfite + water + carbon dioxide
magnesium carbonate + nitric acid → magnesium nitrate + water + carbon dioxide
magnesium carbonate + hydrochloric acid → magnesium chloride + water
magnesium carbonate + nitric acid → magnesium nitrate + hydrogen + carbon dioxide
When answering questions like this, make sure you check that you have the correct salt for the acid as well as the correct other products from the reaction
3.
What sort of reaction is represented by the following word equation?

iron oxide + carbon monoxide → iron + carbon dioxide?
Thermal decomposition
Reduction
Oxidation
Catalytic cracking
This is one of the reactions taking place in the blast furnace to produce iron
4.
What elements are present in the reactants in the following chemical reaction?

Magnesium carbonate + hydrochloric acid → magnesium chloride, water and carbon dioxide?
Mg, C, H, Cl
Mg, C, O, Zn, Cl
Mg, C, O, H, Cl
Mg, Na, H, S, O
You should be able to get this from the names but if you are not sure, you can also check by looking at the products
5.
What type of reaction is illustrated by the following word equation?

methane + oxygen → carbon monoxide + water
Incomplete combustion
Complete combustion
Incomplete reduction
Complete polymerisation
This word equation represents what happens when any hydrocarbon fuel is burnt in a limited amount of air
6.
When a reactive metal reacts with water, it forms the metal hydroxide and hydrogen. Which of the following is the correct word equation for a Group 1 metal?
calcium + water → calcium hydroxide + hydrogen
aluminium + water → aluminum hydroxide + hydrogen
lithium + water → lithium hydroxide + hydrogen
magnesium + steam → magnesium hydroxide + hydrogen
The others are not in Group 1 of the periodic table
7.
Which of the following is the correct word equation for the reaction of a metal with an acid?
copper + sulfuric acid → copper sulfite + hydrogen
zinc + hydrochloric acid → zinc nitrate + oxygen
sodium + nitric acid → sodium nitrate + oxygen
magnesium + sulfuric acid → magnesium sulfate + hydrogen
Metals above hydrogen in the reactivity series will react with strong acids to form the metal salt and hydrogen. Options 2 and 3 can be discarded immediately as they break the law of conservation of matter. The wrong salt is mentioned in the first option - you get sulfates from sulfuric acid
8.
Which of the following word equations shows the thermal decomposition of limestone?
calcium oxide → calcium + oxygen
calcium hydroxide → calcium + water
calcium carbonate → calcium hydroxide + carbon dioxide
calcium carbonate → calcium oxide + carbon dioxide
For the exam, you should know that the main chemical of limestone is calcium carbonate and when metal carbonates undergo thermal decomposition they form the metal oxide and release carbon dioxide
9.
Where a metal reacts directly with a non-metal, the name of the resulting chemical ends in which letters?
-ide
-ate
-ite
-ic
Chemical names ending in -ate or -ite always contain oxygen as well as the other non-metal. So if you wrote the word equation carbon + sulfur → carbon sulfate, you should realize that it is wrong because there is no oxygen on the side of the reactants
10.
Which of the following lists gives the salts that are made from the common lab acids - sulfuric, nitric and hydrochloric?
Sulfite, nitrite, chlorate
Sulfite, nitrate, chlorate
Sulfate, nitrate, chlorate
Sulfate, nitrate, chloride
There are chemical reasons for these names but for your exam you just need to remember which acid forms which salt
Author:  Kev Woodward

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