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7F
Key Stage 3 Science
| Question | Answer |
|---|---|
| Describe the difference between a hazard of a substance and the risk of using that substance. | A hazard is anything that has the potential to cause harm, A risk is the chance that a hazard will actually cause harm |
| What colour will litmus turn in oven cleaner, lemon juice, vinegar and toothpaste | oven cleaner = blue, lemon juice = red, vinegar = red and toothpaste = blue |
| What is an indicator | A dye that changes to different colours in acids and alkalis |
| Which numbers on the pH scale show a substance to be acidic, neutral and alkaline? Which number shows the most acidic and the most alkaline | Acid = 1-6 Neutral = 7 Alkali 8-14 The most acidic =1 The most alkaline =14 |
| Why can litmus not be used to find the pH of a solution, which indicator must be used instead. | Litmus has only two colours, Universal Indicator must be used |
| Describe what happens to an acid as an alkali is added to it | The acid is neutralised |
| What are the two products of the reaction between an acid and alkali | A salt and water |
| Name the salts produced by the reactions of A)Sodium Hydroxide and Hydrochloric acid B) Copper Oxide and Sulfuric Acid | A) Sodium Chloride and water B) Copper Sulfate and Water |
| Define the meaning of the word base | Any substance, soluble or insoluble, that neutralises an acid forming a salt and water only |
| Explain the difference between a base and an alkali | Alkali's are bases that can dissolve in water |
| When making copper sulfate why is an excess of copper oxide added to the acid | To ensure that all the acid has reacted |
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Davenant Foundation School
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