Question

2 multiple answer 5 points
select the four signs of chemical reactions discussed in class.
☑️ unexpected color change
☑️ formation of a precipitate
□ change in weight
☑️ formation of a gas
□ production of a sound
☑️ formation of heat and/or light

3 multiple choice 5 points
which option was an indication of a chemical change that you saw in this lab?
○ production of light
○ formation of a precipitate
● production of a gas
○ change in weight

Explanation:

For question 2, the standard signs of a chemical reaction include unexpected color change, precipitate formation, gas formation, and release of heat/light; weight change and sound production are not standard class-discussed signs. For question 3, the selected option "Production of a gas" is the identified lab observation of chemical change.

Answer:

Question 2:

• Unexpected color change
• Formation of a precipitate
• Formation of a gas
• Formation of heat and/or light

Question 3:

Production of a gas