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Chemical Reactions Worksheet
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Chemical Reactions Worksheet
Use the evidence in each question to investigate chemical reactions. Remember: a chemical reaction forms one or more new substances. Write clear answers using scientific vocabulary.
What counts as a reaction?
Decide whether each change forms a new substance.
1.A puddle dries in the sunshine. Is this a chemical reaction or a change of state? Explain what happens to the water.
2.Which statement best describes a chemical reaction?
- A substance changes shape but stays the same substance.
- One or more new substances are formed from the starting substances.
- A solid always melts into a liquid.
Reaction detectives
Use the reaction descriptions and the evidence to identify what is happening.
3.Match each reaction type to its description.
- Combustion
- Synthesis
- Decomposition
- One substance breaks down into simpler substances.
- A substance burns in oxygen.
- Two or more substances join to make a new substance.
4.Magnesium reacts with oxygen to make magnesium oxide. Write this as a word equation, then name the reaction type.
5.Hydrogen peroxide breaks down into water and oxygen. Write the word equation and identify the reaction type.
6.The nail has reacted with oxygen and water to form rust. Is rusting a chemical reaction? Give one piece of evidence from the description.
7.When methane burns in oxygen, carbon dioxide and water form. Write the word equation and name the reaction type.
Evidence and explanation
Think about how reactions can be recognised and whether they can be reversed.
8.A student mixes two clear liquids. Bubbles appear and the mixture becomes warmer. Name two observations that could be evidence of a chemical reaction. Explain why neither observation alone proves a new substance formed.
9.Heating hydrated copper sulfate drives off water and leaves anhydrous copper sulfate. Adding water can change it back. Is this change reversible or irreversible? What does the symbol ⇌ mean in a reaction equation?
10.Burning wood produces ash, smoke and gases. Explain why burning wood is usually described as an irreversible chemical reaction.
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