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The observed evidence to support that this reaction was a chemical change are 1) A new yellow colour appears 2) A solid yellow precipitate forms in the liquid 4) This change is impossible to reverse
The observed evidence to support that this reaction was a chemical change are 1) A new pink colour appears 2) The change is impossible to reverse 3) The starting material Phenolphthalein is used up
The observed evidence to support that this reaction was a physical change are 1) dissolving the water turned from a colourless liquid to a light blue liquid in colour 2) This reaction is not difficult to reverse
The observed evidence to support that this reaction was a chemical change are 1) The starting material Bromothymol Blue is used up 2) A new pale orange colour appears 3) The change is difficult to reverse
The observed evidence to support that this reaction was a Physical change are 1) There was a change in state from a liquid to a solid 2) the reaction was not difficult to reverse
The most difficult changes to classify were the chemical changes. the physical changes were easier to spot because there was only a change to the state or form but the substance still remains the same so even though the salt was heated the salt was still there but just in a different shape. Also, the dissolving even thought the copper sulfate when into the water it was still copper sulfate and can be easily reversed by just boiling the water. On the other hand the chemical changes were more difficult because
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