for a science project, janet performs four experiments that are supposed to show a chemical reaction. she…

for a science project, janet performs four experiments that are supposed to show a chemical reaction. she displays her results in a table.\n| experiment | substances | evidence of reaction | chemical reaction? |\n| ---- | ---- | ---- | ---- |\n| 1 | water + heat | gas formation | yes |\n| 2 | vinegar + baking soda | gas formation | yes |\n| 3 | cabbage juice + lemon juice | color change | yes |\n| 4 | liquid a + liquid b | precipitate formation | yes |\nin the column titled \chemical reaction?\, which experiments data should be changed to \no\?\no experiment 1\no experiment 2\no experiment 3\no experiment 4

for a science project, janet performs four experiments that are supposed to show a chemical reaction. she displays her results in a table.\n| experiment | substances | evidence of reaction | chemical reaction? |\n| ---- | ---- | ---- | ---- |\n| 1 | water + heat | gas formation | yes |\n| 2 | vinegar + baking soda | gas formation | yes |\n| 3 | cabbage juice + lemon juice | color change | yes |\n| 4 | liquid a + liquid b | precipitate formation | yes |\nin the column titled \chemical reaction?\, which experiments data should be changed to \no\?\no experiment 1\no experiment 2\no experiment 3\no experiment 4

Answer

Explanation:

Step1: Understand chemical reaction

A chemical reaction results in the formation of new substances. Physical changes like boiling water just change the state.

Step2: Analyze Experiment 1

Heating water to form gas (steam) is a physical change (vaporization), not a chemical reaction as no new substance is formed. Water in liquid and gas state is still $H_2O$.

Step3: Analyze other experiments

Vinegar + baking soda forms carbon - dioxide gas through a chemical reaction. Cabbage juice + lemon juice has a color - change due to a chemical reaction between acidic substances. Liquid A + liquid B forming a precipitate is also a chemical reaction.

Answer:

Experiment 1