Which of the following is not true about chemical changes in matter?Question 7Select one:a.Heat, light, or electrical energy is often emitted or absorbed.b.Changes in state, changes in particle size, and the formation / separation of mixtures are all examples.c.Reactivity changes with the formation of new substances.d.Alters the makeup of a substance.

To determine which of the statements is not true about chemical changes in matter, let's analyze each option:

a. Heat, light, or electrical energy is often emitted or absorbed. This statement is true. During a chemical change, energy can be released or absorbed in the form of heat, light, or electrical energy.

b. Changes in state, changes in particle size, and the formation/separation of mixtures are all examples. This statement is also true. Changes in state (such as melting or boiling), changes in particle size (such as grinding or crushing), and the formation or separation of mixtures (such as dissolving or filtering) are all examples of physical changes, not chemical changes.

c. Reactivity changes with the formation of new substances. This statement is true. When a chemical change occurs, new substances are formed, and their reactivity can be different from the original substances.

d. Alters the makeup of a substance. This statement is also true. Chemical changes involve the alteration of the composition or makeup of a substance, resulting in the formation of new substances with different properties.

Therefore, the statement that is not true about chemical changes in matter is option b. Changes in state, changes in particle size, and the formation/separation of mixtures are examples of physical changes, not chemical changes.