Chapter 1 Part 2 Test

1. An element is a pure substance that cannot be broken down into other substances by physical or chemical means.

• True
• False

2. If a neutral atom contains 18 protons, it also contains 18 electrons.

• True
• False

3. Going across one period in the periodic table of the elements, all the elements in that period have the same number of protons.

• True
• False

4.The protein Hemoglobin is designed to carry oxygen in the blood

• True
• False

5. Water is an example of an organic compound.

• True
• False

6. Carbon is the main element in organic compound, so carbon is essential to life on Earth

• True
• False

7. A chemical reaction is the process by which atoms or groups of atoms in substances are reorganized into different substances.

• True
• False

8. When an endothermic chemical reaction takes place, heat is released into the environment.

• True
• False

9. A catalyst increases the rate of a reaction by increasing the net energy change of the reaction.

• True
• False

10. A substrate binds to an enzyme’s active site.

• True
• False