Question

1. Burning a candle is a chemical change. What is the primary evidence that burning the candle is a chemical reaction?

Question options:

change in color
temperature change
formation of a solid
change in odor

2.Maria and Carla were hiking when Maria tripped, fell, and sprained her ankle. Carla took out the first-aid kit and unwrapped a cold pack. Carla popped a vial that was inside the cold pack. The two chemicals inside the pack mixed together and the pack began to get icy cold. Carla applied the pack to Maria's ankle.

What kind of reaction occurred in the cold pack? What evidence supports your answer?

Question options:

It is a physical change as evidenced by a drop in temperature.
It is a chemical change because heat energy is absorbed and the pack gets colder.
It is a chemical change because two different chemicals are mixed together.
It is a physical change because the substance in the vial dissolved in the pack's liquid.
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Answer 1

temperature change

Step-by-step explanation:

Answer 2

Answer 1) Option B) Temperature Change

Explanation :

The burning of candle is the reaction where both physical and chemical changes occurs. A physical change where the melted wax is cooled and the wax is obtained again. Whereas the chemical change takes place when the wick of the candle burns using the oxygen in the air and produces heat and light. So, this change in temperature is a chemical change as the burning process cannot be reverse, from the burnt products like soot, smoke and carbon dioxide. Therefore, the temperature change is the evidence of a chemical change in the burning of candle.

Answer 2) Option B) It is a chemical change because heat energy is absorbed and the pack gets colder.

Explanation :

When Clara is mixing the vial contents the ice pack gets colder. On application of the ice pack on the injured area absorbs the heat from that region and becomes more colder. This happens because in the ice pack was the medium for the temperature change that was occurring. This temperature change by absorbing heat getting colder is the evidence of a chemical change.