bellab0123
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when you blow dry your hair

physical or chemical change? and briefly explain why

you forgot to dry the bread knife when you washed it and reddish brown spots appeared on it

physical or chemical change?and briefly explain why

you decide to toast a piece of bread but leave it in the toaster too long. the bread is black and the kitchen is full of smoke.

physical or chemical change?and briefly explain why

baking powder reacts to release carbon dioxide bubbles. the carbon dioxide bubble cause the dough to rise.

physical or chemical change?and briefly explain why

you take out your best silver spoons and notice they are very dull and have some black spots.

physical or chemical change? and briefly explain why

in a fireworks show the fireworks explode giving off heat and light.

physical or chemical change? and briefly explain why

Respuesta :

bowieotter
In short a physical change is something that changed the way something looks but doesn't affect the chemical makeup. Drying your hair doesn't change the color of your hair, it just makes it dry so thats a physical change. Rust forming on a knife is a chemical change becaause the water reacts with the chemical makeup of the knife. Hope that helps.
Any change that occurs without altering the chemical composition of a substance is a physical change. Physical changes can include changing the color, shape, state of matter, or volume of a substance
A usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change.

The answers to the questions are :
Physical
Chemical
Chemical
Chemical
Chemical
Chemical

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