Please select a subject first
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State the various characteristics of chemical reactions.
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State one characteristic of the chemical reaction which takes place when dilute hydrochloric acid is added to sodium carbonate.
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State one characteristic of the chemical reaction which takes place when lemon juice is added gradually to the potassium permanganate solution.
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State one characteristic of the chemical reaction which takes place when dilute sulphuric acid is added to barium chloride solution.
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State one characteristic of the chemical reaction which takes place when quicklime is treated with water.
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State one characteristic of the chemical reaction which takes place when wax is burned in the form of a candle.
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What do you understand by exothermic reactions?
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What is produced if an acid is added to a base?
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What colour does phenolphthalein indicator turn when added to an alkali (such as sodium hydroxide)?
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What do you understand by endothermic reactions?
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Give one example of an exothermic reaction.
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Give one example of an endothermic reaction.
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Which of the following are endothermic reactions and which are exothermic reactions?
- Burning of natural gas
- Photosynthesis
- Electrolysis of water
- Respiration
- Decomposition of calcium carbonate
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One of the following does not happen during a chemical reaction. This is:
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Which of the following does not involve a chemical reaction?
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You are given the solution of lead nitrate. In order to obtain a yellow precipitate you should mix with it a solution of ______.
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An acid which can decolourise purple coloured potassium permanganate solution is ______.
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The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be ______.
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The chemical reaction between quicklime and water is characterised by ______.
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Which of the following is not an endothermic reaction?
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