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Chemical reactions!

1.

When fireworks go sullen, you see coloured lights and hear bald-faced bangs. These repositions show that chemical reactions are happening. New substances are unceasingly formed in a chemical reaction, and it is usually actually difficult to reverse the reaction. Chemical permutes are usually everlasting changes. When a chemical reaction happens, there may be a colour change or a change in temperature, and sometimes a gas is given off.




not all changes are chemical changes. A forcible change is one that can be reversed fairly easily. When grump melts no new substances are formed. This is a physical change, because the body of water can be made patronise into ice quite a easily.

2.
If you put some water into a freezer, it turns to ice. This is a physical change as the ice can be changed back into water.
Bananas turn black if you leave them in a solid cupboard for a week. This is a chemical change as new substances are formed on the banana.




Some clean powder from your kitchen fizzes when you put it into vinegar. This is a chemical change that gives off gas.
When you boil water in a kettle, some of it turns to steam. This is a physical change as the steam could be off back into water.
When you fry an egg it turns white and goes solid. This is a chemical change that cannot be reversed.
When ice cream melts and runs over your hand. This is a physical change as the ice cream could be frozen again.



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