Question

1. choose the best answer. a(n) __ substance is made up of two or more different elements chemically bonded together. atom mixture extensive compound 2. choose the best answer. when two or more substances combine to make a new substance, a __ change has occurred. slow physical fast chemical

Explanation:

1. An atom is the smallest unit of an element. A mixture is a combination of two or more substances that are not chemically bonded. Extensive refers to a property that depends on the amount of substance. A compound is made up of two or more different elements chemically bonded together.
2. A slow or fast change just describes the rate. A physical change does not result in a new substance. When two or more substances combine to make a new substance, a chemical change has occurred as chemical bonds are broken and new ones are formed.

Answer:

1. D. compound
2. D. chemical