Answers 26-27 CFISD TX-Chemistry A CRLab: Physical and Chemical Changes

Lab: Physical and Chemical Changes Answers

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Which answer below correctly identifies the type of change and the explanation for the heating of copper(II) sulfate pentahydrate?

physical change because even though the change caused the temperature of the copper(II) sulfate pentahydrate to increase, the compound’s physical properties remained exactly the same

physical change because even though gas formation was observed, the copper(II) sulfate pentahydrate was undergoing a state change, which means that its properties are preserved

chemical change because gas was released along with a color change, which indicated that the copper(II) sulfate pentahydrate was transformed into a different substance

chemical change because a temperature change was observed, which indicated that the copper(II) sulfate pentahydrate was transformed into a different substance

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Which answer below correctly identifies the type of change and the explanation when potassium iodide and lead nitrate are mixed?

physical change because the observation of a solid forming is evidence of a state change, which is reversible

physical change because even though the mixture had a color that was different from either of the two solids alone, each solid’s physical properties remained exactly the same

chemical change because two substances were mixed, which always results in the formation of a new substance

chemical change because both a color change and a solid formation were observed, which provide strong evidence of a new substance

Did you record all data throughout the virtual lab experiment?

yes

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Lab: Physical and Chemical Changes Answers

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