Physics, 13.10.2019 00:00 Haneendye123

Which would show an example of how physical changes are reversible? cutting a gold bar in two peices and then putting the pieces next to eachother. or burning a match and then relighting it. or melting tin and then cooling it into a mold. or combining sodium and chlorine to make the new material of table salt

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Answer from: queengenni

Melting tin and then cooling it into a mold is the process which showing physical changes are reversible.

Explanation:

Physical change:

The physical change is the change of shape, size or state of the substance. by physical change a new substance is formed. The physical change can be reversible.

Chemical change:

The change or rearrangement of atoms is there , the change is called the chemical change. which leads to the formation of new substance.

(A) The physical change which is not reversible is cutting a gold bar into pieces next to each other.

(B)Burning a match and then realigning is a chemical change as new substance are formed.

(C)Melting tin and then cooling it into a mold: This is a physical change and it is reversible as its original state is achieved again.

(D)Combination of sodium and chlorine to make the new material of table salt as it is a chemical change.

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Answer from: smcculleymcculley

melting tin and then cooling it into a mold

Explanation: Physical change is a change in which shape, size or state of the substance is changed and no new substance is formed. Physical changes can be reversed by

Chemical change: When there is a change in rearrangement of atoms which leads to the formation of the new substance.

a) Cutting a gold bar in two pieces and then putting the pieces next to each other: It is a physical change but it is not reversible as original state is not achieved again.

b) burning a match and then relighting it: This is a chemical change as new substances are formed.

c) melting tin and then cooling it into a mold: This is a physical change and is reversible as the original state has been achieved again.

d) combining sodium and chlorine to make the new material of table salt: It is a chemical change. $2Na+Cl_2\rightarrow 2NaCl$

Answer from: Quest

Planck decided to assume that atoms could only vibrate at certain frequencies that were whole numbers eg 2f, 3f and so on. others used to think that atoms vibrate continuously

Answer from: Quest

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