As you learned in the previous section, the signs (or evidence) of chemical change are

• production of a gas (bubble formation),
• change in temperature,
• formation of a precipitate (a solid),
• change in color, and
• production of a new odor.

In the following two online labs, you will combine different chemicals and look for evidence of chemical changes.

Answer the following questions on your paper.

1. What evidences of a chemical change did you observe in this investigation?

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   Check Your Answer

   Color change and the formation of a precipitate

2. What type of investigation (descriptive, comparative or experimental) would this lab activity?

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   Check Your Answer

   Descriptive investigation

3. Identify safety procedures that you would need to follow if you were performing this activity in your science laboratory.

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   Check Your Answer

   1. Wear chemical splash googles
   2. Wear gloves
   3. Wear aprons
   4. Pull back long hair
   5. Wear closed toed shoes
   6. Keep work area free of clutter
   

Answer the following questions on your paper.

1. What evidences of a chemical change did you observe in this investigation?

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   Check Your Answer

   Temperature change (decrease) and the formation of a gas (bubbles formed)

2. What type of investigation (descriptive, comparative or experimental) is this lab activity?

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   Check Your Answer

   Descriptive investigation

3. Identify safety procedures that you would need to follow if you were performing this activity in your science laboratory.

   Interactive popup. Assistance may be required.

   Check Your Answer

   1. Wear chemical splash googles
   2. Wear gloves
   3. Wear aprons
   4. Pull back long hair
   5. Wear closed toed shoes
   6. Keep work area free of clutter