# Simple Word Equations Quiz

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A quiz designed to for NZ Year 9 or 10 students who are just learning about word equations for chemical reactions.

• 1.

### When a CHEMICAL reaction occurs, what is made?

• A.

• B.

A new substance is made, and new atoms are formed

• C.

A new substance is made, but atoms are not created or destroyed, they are just rearranged

C. A new substance is made, but atoms are not created or destroyed, they are just rearranged
Explanation
In a chemical reaction, a new substance is formed, but the atoms involved are not created or destroyed. Instead, they are rearranged to form the new substance. This is known as the Law of Conservation of Mass, which states that matter cannot be created or destroyed in a chemical reaction, only transformed.

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• 2.

### What does this word equation represent?  iron+    oxygen iron oxide

• A.

A physical change in iron (nothing new gets made)

• B.

A chemical reaction between iron and oxygen, where rust (iron oxide) is produced (made)

• C.

A chemical reaction between iron and rust, where oxygen is produced

B. A chemical reaction between iron and oxygen, where rust (iron oxide) is produced (made)
Explanation
The word equation "iron + oxygen = iron oxide" represents a chemical reaction between iron and oxygen, where rust (iron oxide) is produced.

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• 3.

### Magnesium (a grey metal) can be burned in air to produce magnesium oxide (a white powder).which is the correct word equation for the reaction that happens? (Hint, many of the gases in air don't react with other substances easily).

• A.

magnesium + oxygen -------> magnesium oxide

• B.

magnesium + oxygen -------> iron oxide

• C.

magnesium + air gases -------> magnesium oxide

• D.

magnesium + air gases -------> white powder

A. magnesium + oxygen -------> magnesium oxide
• 4.

### Sodium (a soft white metal) reacts with chlorine (a smelly gas used to keep pool water clean) to produce sodium chloride (plain old table salt!). Which is the correct word equation for this chemical reaction?

• A.

sodium chloride + salt -------> chlorine

• B.

sodium + air gases -------> white powder

• C.

sodium + chlorine -------> sodium chloride

• D.

sodium + chloride -------> sodium chloride

C. sodium + chlorine -------> sodium chloride
Explanation
The correct word equation for the chemical reaction between sodium and chlorine is "sodium + chlorine -> sodium chloride." This is because sodium reacts with chlorine to produce sodium chloride, which is table salt.

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• 5.

### Iron (a grey metal) reacts with sulfur (a smelly yellow solid) to produce iron sulfide (a black solid).

• A.

iron + sulfur -------> iron sulfide

• B.

iron + sulfur -------> iron sulfur

• C.

iron + sulfide -------> iron sulfide

• D.

iron + sulfur -------> iron sulfite

A. iron + sulfur -------> iron sulfide
Explanation
When iron (a grey metal) reacts with sulfur (a smelly yellow solid), it forms iron sulfide, which is a black solid. The correct answer is "iron + sulfur ------> iron sulfide" because it accurately represents the reaction between iron and sulfur and the resulting product.

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• 6.

### Lead is a grey metal. When it reacts with oxygen (a clear odourless gas) a white powder is produced.Which is the correct word equation?.

• A.

• B.

• C.

Explanation
When lead reacts with oxygen, it forms lead oxide, which is a white powder.

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• 7.

### Which word equation represents hydrogen (explosive clear gas) reacting with sulfur (smelly yellow solid) to produce a smelly gas.

• A.

hydrogen gas + sulfur -------> hydrosulfide

• B.

hydrogen + sulfur -------> hydrogen sulfide

• C.

hydrogen gas + sulfur -------> hydrogen sulfide

B. hydrogen + sulfur -------> hydrogen sulfide
Explanation
Hydrogen (explosive clear gas) reacts with sulfur (smelly yellow solid) to produce a smelly gas called hydrogen sulfide.

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• 8.

### Now use your powers of deduction (infer things from the questions you have already answered!). Which of the following is a list of some properties that may be changed during a chemical reaction?

• A.

Shape, state (solid, liquid, gas), and colour

• B.

State, odour (smell), and shape

• C.

Odour, colour and state.

C. Odour, colour and state.
Explanation
The properties that may be changed during a chemical reaction include odour, colour, and state. This can be inferred from the fact that the other options mention shape and state as properties that may change, but do not include odour and colour. Therefore, the correct answer is odour, colour, and state.

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• Current Version
• Mar 21, 2023
Quiz Edited by
ProProfs Editorial Team
• Jul 10, 2010
Quiz Created by
Hrobinson

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