Answers26-27 CFISD TX-Chemistry A CRLab: Physical and Chemical Changes

Lab: Physical and Chemical Changes Answers

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1
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Which answer below correctly identifies the type of change and the explanation for the boiling of water?

A
physical change because even though the change caused the temperature of the water to increase, the water’s physical properties remained exactly the same
B
physical change because even though gas formation was observed, the water was undergoing a state change, which means that its original properties are preserved
C
chemical change because gas formation was observed, which indicated that the water was transformed into a different substance
D
chemical change because a temperature change was observed, which indicated that the water was transformed into a different substance
2
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Which answer below correctly identifies the type of change and the explanation for the separation of the iron with sulfur?

A
physical change because even though a color change occured, each solid maintained its original properties, which could be seen as soon as the magnet was applied
B
physical change because no temperature change was observed, which would be an indicator of chemical change
C
chemical change because a color change was observed, which indicated that a new substance was formed
D
chemical change because the results depended on the interaction of two substances
3

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

A
physical change because the observation of a solid forming is evidence of a state change, which is reversible
B
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
C
chemical change because two substances were mixed, which always results in the formation of a new substance
D
chemical change because both a color change and a solid formation were observed, which provide strong evidence of a new substance
4

Did you record all data throughout the virtual lab experiment?

A
yes
B
no

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