What are some evidences of a chemical change?

Answer 1

Cooling and warming the solutions are physical change. When your hand or your body after washing gets dry it's a ohysical change. When you stir your coffee or your tea it's a physical change. But when you cook your food or when the petrol of cars burn it's a chemical change. Because the compositions of the molecules changes. The most complex chemical change happens in our body everyday.And the enzymes are involved there. The photosynthesis of plants are another examples of chemical changes. When you wash your hand by detergents, they acts by fats and pollutions then your wash will be cleaned and it's another example of chemical changes. Cooling and warming the solutions are physical change. When your hand or your body after washing gets dry it's a ohysical change. When you stir your coffee or your tea it's a physical change. But when you cook your food or when the petrol of cars burn it's a chemical change. Because the compositions of the molecules changes. The most complex chemical change happens in our body everyday.And the enzymes are involved there. The photosynthesis of plants are another examples of chemical changes. When you wash your hand by detergents, they acts by fats and pollutions then your wash will be cleaned and it's another example of chemical changes.

Answer 2

Chemical changes usually result in products that are different from the reactants. Evidences of a chemical change include a temperature change, color change, production of gas, a substance disappears and a new solid is formed.

Answer 3

All that i know is that there are only 3 common types of evidence for a chemical change.

- A change in color

- Production of a Gas

-Formation of a precipitate.

sorry if that doesn't answer your quetstion

Answer 4

There are several evidence for a chemical reaction. some of them are,

evolution of heat or increase in temperature of the system.

change of color

precipitation

emission of light

Answer 5

Some signs (or evidence) of chemical change are: a gas is produced, the temperature changes, a substance disappears, a solid is formed a colour change occurs, a new odour is produced.

Answer 6

this is the reaction w/c can have a chemical change, or change in color

Answer 7

three types of evidence of chemical change is tempurture and color chances and ice melts thats all i know

Answer 8

Explain how a mixture of sand and salt can be separated.

Answer 9

Three types of evidence of chemical change include change in temperature, formation of a precipitate, and formation of a gas.

Answer 10

temp/color change/production of a gas