Chemical Change Clues

Question 1

Meaning of Exothermic?

Answer 1

Heat or light (any type of energy) is given off

Question 2

Meaning of Endothermic?

Answer 2

Energy, usually in the form of heat, is needed

Question 3

1st clue of chemical change?

Answer 3

New colour appears

Question 4

2nd clue of chemical change?

Answer 4

Heat or light is given off, makes exothermic reaction

Question 5

3rd clue of chemical change?

Answer 5

Bubbles or gas are formed

Question 6

4th clue of chemical change?

Answer 6

Solid material, called precipitate, is formed

Question 7

5th clue of chemical change?

Answer 7

Energy, usually as heat, is needed, makes endothermic reaction

Question 8

6th clue of chemical change?

Answer 8

The change is difficult to reverse

Question 9

What were “The Vials”?

Answer 9

2 clear liquids were mixed together and formed a canary yellow liquid, and formed precipitate later on. Example of clues 1, 4, and 6

Question 10

What was “The Jug”?

Answer 10

A 5 gallon water container’s inside was coated in isopropyl alcohol, the extra was drained off. A lighter was the used, causing it to fire up suddenly. Smoke is left behind in the container, and water is formed