Question

Which best describes the difference between a physical change and a chemical change?

A. A chemical change does not result in a new substance being formed, whereas a physical change does.

   B. A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

   C. A physical change produces a new element, and a chemical change results in a bond breaking between atoms.

   D. A chemical change results in a new element being formed, and a physical change results in a new compound being formed.

Answer 1

The difference between physical and chemical changes is that a physical change does not alter the chemical composition of a substance, while a chemical change results in new substances with different properties.

Step-by-step explanation:

The difference between a physical change and a chemical change is how the composition of the substance is affected. In a physical change, the appearance, state, or shape of a substance may change, but its chemical composition remains the same. Examples include melting, freezing, and dissolving. In contrast, a chemical change involves the breaking and forming of bonds between atoms, resulting in new substances with different properties. Indicators of a chemical change include a color change, temperature change, light emission, gas production, and the formation of a precipitate.

Given the options provided, the correct answer is B: A physical change is a change from one state of matter to another; a chemical change results in a new substance formed. This option accurately captures the essence of physical and chemical changes in substances.

Answer 2

• The correct answer is B.

A physical change is a change from one state of matter to another; a chemical change results in a new substance formed.

Physical properties:

Physical properties are those which have same composition. In other words, composition does not change, only state may be change like solid to liquid, liquid to gas, solid to liquid etc.

Example.

Water when freezes into ice, it is physical change, just state is change.

Chemical properties:

The chemical properties depend upon composition.

Example:

Formation of precipitates is an example of chemical change.