Question

part i-matching

1. the image shows what happens when cold medicine tablets are placed in room temp water.

image: glass with tablets, labels: bubbles produced, tablets dissolve, water level rises, water becomes cloudy
what evidence would indicate that a chemical change has occurred?
a. the tablets dissolved in water.
b. the water becomes cloudy.
c. the water level increases slightly.
d. bubbles are given off and there is a temperature change.

Explanation:

A chemical change involves new substance formation. Dissolving (A), clouding (B), and water level rise (C) are physical changes. Bubbles (gas production) and temperature change (energy change) in D indicate a chemical reaction.

Answer:

D. Bubbles are given off and there is a temperature change.