8TH GRADE 1ST SEMESTER SCIENCE

UNIT 1

100

If krypton has an atomic number of 36 and mass number of 84, how many protons, neutrons, and electrons does it have?

protons = 36

neutrons = 48

electrons = 36

200

how many valence electrons are in an element in Group 15 of the periodic table?

5

300

What are the properties of Group 18?

(what makes them special)

They are noble gasses, gasses at room temperature and chemically stable.

400

how many energy shells does Gold have?

6

500

What is the atomic number of Zinc?

30

UNIT 2

100

What are 2 signs that a chemical reaction has occured?

bubbles, precipitate, change in color, temperature change

200

Tearing is an example of what kind of change?

Physical Change

300

Burning wood in a fireplace is an example of what kind of change?

Chemical Change

400

how many atoms are in a molecule of serotonin?

C₁₀H₁₂N₂O

25

500

Why is baking a cake an example of a chemical change?

the cake rises as gas bubbles form in the baking process.

UNIT 3

100

4 boxes are sliding with constant speed before each box experiences an unbalanced force of 8N. Which box would experience the greatest acceleration when the unbalanced force is applied?

Box 1=2kg  Box 2=4kg  Box 3=6kg  Box 4=8kg

Box 1

200

Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?

(this about their masses, which one will take the least amount of force to stop?)

a smaller car will require less force

300

 Newton’s law stating that for every action force there is an equal and opposite reaction force; often referred to as Newton’s third law of motion

Newton's Third Law of Action-Reaction

400

The change in an object’s position with respect to time and in comparison with the position of other objects used as reference points

Vocab Word

Motion

500

Measurement of speed and direction of an object

Vocab Word

Velocity

UNIT 4

100

What kind of heating is a lava lamp an example of?

Convection

200

What is one condition that is necessary for a hurricane to form?

warm ocean waters

300

Hurricanes are put into _____ based off their wind speeds.

Categories

400

What causes the wind to blow?

The uneven heating of Earth’s surface causes warm air in some locations to rise and expand. Cool air rushes in to take its place.

500

What is the source of the thermal energy that heats our planet’s atmosphere?

The Sun

7TH GRADE

100

Primary succession occurs when pioneer species move into an area that has no plants. What kind of organisms are common pioneer species?

Mosses and lichens that can grow on rocky surfaces

200

What is the main functions of the human skeletal system?

(there are 4 things it does)

to support the body, protect organs, produce blood cells and store calcium.

300

Plants use energy from sunlight, water, and carbon dioxide to produce sugar. Which structure is found only in plant cells and helps plants capture energy from sunlight?

Chloroplast

400

Certain species of whiptail lizards have only female individuals and no males. These lizards reproduce asexually. What is one disadvantage of asexual reproduction for these lizards?

all members of a population are genetically very similar and less able to survive environmental changes.

500

What is the "powerhouse" of the cell?

MITOCHONDRIA!!