Question

1. choose the best answer.

what is a substance made up of two or more different elements chemically bonded together?
atom
mixture
extensive
compound

1. choose the best answer.

the smallest unit of an element that maintains all of the chemical properties of that element is a(n)
compound
atom
mixture
molecule

Explanation:

For question 9:

• An atom is the basic unit of a chemical element.
• A mixture is a combination of two or more substances not chemically bonded.
• Extensive refers to a property (like mass) that depends on the amount of substance.
• A compound is made up of two or more different elements chemically bonded.

For question 10:

• A compound is made of different elements.
• An atom is the smallest unit of an element maintaining its chemical properties.
• A mixture is a combination of substances.
• A molecule is made of atoms (can be of same or different elements).

Answer:

1. D. compound
2. B. atom