Question

WHO WILL ANSWER FIRST, 1 FOLLOW, THANK AND BRAINLIST. IN THIS, ANSWER ANY 3 QUESTIONS CORRECT.


IF YOU DON'T KNOW WHAT THE ANSWER JUST LEAVE IT.



SO URGENT GUYS PLZ HELP!!​

Answer 1

Answer:

1. The changes that can be reversed again and again are known as physical changes. The changes that cannot be reversed when done once are known are chemical changes.

2. No, not all the materials get rusted.

3. sry, next two i don't know

Explanation:

Answer 2

Answer:

1 . a chemical change result from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. example of chemical changes.. burning of paper... example of physical changes.. cutting of paper..

2. the eggshell is composed of calcium carbonate. when nitric acid is added to eggshell which result in the formation of calcium

nitrate and carbon dioxide gas.. eggshell +nitric acid = calcium nitrate + carbon dioxide + water..

hope it's helps you..