Question

for a science project, janet performs four experiments that are supposed to show a chemical reaction. she displays her results in a table. in the column titled \chemical reaction?\, which experiments data should be changed to
o\? experiment 1 experiment 2 experiment 3 experiment 4

Explanation:

Step1: Recall chemical reaction criteria

A chemical reaction results in a new substance being formed, often with signs like gas formation, color - change, precipitate formation etc. But heating water is a physical change.

Step2: Analyze each experiment

Experiment 1: Heating water causes boiling which is a physical change (liquid to gas phase change of water), not a chemical reaction. Experiment 2: Vinegar and baking soda react to form carbon - dioxide gas and new substances, it's a chemical reaction. Experiment 3: Color change in cabbage juice and lemon juice is due to acid - base reaction, a chemical reaction. Experiment 4: Precipitate formation indicates a chemical reaction.

Answer:

Experiment 1