What is the difference between physical and chemical change in chemistry?

physical change:

1. the change which are reversable are known as physical change

2.no new substance are formed

3.no change in chemical nature of the substance

4. example: • melting of ice

• tearing of paper etc.

chemical change:

1.this are irreversible this can't be reverse

2.new substance are formed

3.it results form a chemical reaction

4. example: • burning of wood

• rusting of iron etc.

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The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

Ithe undersigned only for use your own email and delete any and copies and of the itself and to be there is a good timewhat does a decrease in temperature indicate about the molecules in a sample of liquid water? decreased chemical energy of the moleculesdecreased kinetic energy of the moleculesincreased chemical energy of the moleculesincreased kinetic energy of the moleculeshow does a sample of helium at 15 â°c compare to a sample of helium at 215 k? the helium at 15 â°c has a higher average kinetic energy than the sample at 215 k.the helium at 15 â°c has lower nuclear energy than the sample at 215 k.the helium at 15 â°c has slower-moving atoms than the sample at 215 k.the helium at 15 â°c has smaller atoms than the sample at 215 k.