science - final exam study guide

Question 1

How do you find the molar mass of a chemical formula?

Answer 1

Subscript x Atomic mass.

Question 2

What bond is two nonmetals?

Answer 2

Covalent bond and they share electrons!

Question 3

What bond is a metal and nonmetal?

Answer 3

Ionic bond and they transfer electrons!

Question 4

When an atom loses electrons:

Answer 4

Anion (negative)

Question 5

When an atom gains electrons:

Answer 5

Cation (positive)

Question 6

Chemical change examples:

Answer 6

Color change, new smell, temperature changes, rust, and cooking.

Question 7

Physical change examples:

Answer 7

Freezing and Melting.

Question 8

What are ways that you can increase the rate of a chemical reaction:

Answer 8

Increasing surface area, temperature, stirring, concentration, and adding a catalyst.

Question 9

Exothermic reaction:

Answer 9

When heat is made because all the cold air is released.

Question 10

Endothermic reaction:

Answer 10

When all the heat is absorbed, causing the cold air to increase.

Question 11

Hydrogen bonds..

Answer 11

Hold 2 or more water MOLECULES together.

Question 12

What is cohesion:

Answer 12

Water molecules are attracted to OTHER water molecules.

Question 13

What is adhesion:

Answer 13

Water molecules are attracted to substances that AREN’T water.

Question 14

What is abiotic and biotic?

Answer 14

Abiotic is nonliving, biotic is living.

Question 15

What is frost wedging?

Answer 15

When water gets into cracks of rocks and expands, then freezes.

Question 16

Tropical Rainforests have infertile soils, list where are most nutrients stored?

Answer 16

In the plants.

Question 17

The one characteristic that Deserts and Tundras have in common:

Answer 17

The amount of precipitation.

Question 18

Why it is almost impossible for trees to grow in the tundra?

Answer 18

Because of permafrost.