Science 8 Benchmark Review

Scientific Theory and Energy

100

If you are testing a theory of different sunlight to plants, but change the water amounts, are your results valid?

No

200

What is the difference between scientific law and scientific theory?

Scientific laws describe what happens in nature under specific conditions, often using mathematical formulas (F=ma), while scientific theories explain why or how those phenomena occur, providing a comprehensive, evidence-based framework.

300

True or false: 

Scientific theories are based on scientific opinion

False

400

Give an example of each

-radiant

-thermal

-mechanical

-electrical

radiant- sunlight

thermal- curling iron

mechanical- sound, rollercoasters

electrical- toaster, lightning

500

SURPRISE- Balance this equation 

_H₂ + _N₂ ~ _NH₃

3H₂ + N₂ ~ 2NH₃

EM/Sound Waves

100

Sonar uses sound waves to determine objects that are...

Under water

200

Sound waves cannot pass through where?

Vacuum (empty space)

300

What are electromagnetic waves?

Unlike sound or water waves, these waves can travel through the vacuum of space because they do not require a medium.

400

As the frequency of a wavelength decreases, the wavelength gets...

longer(lengthens)

500

Name the 7 types of waves on the EM Spectrum

Radio, Microwave, Infrared, Visible, UV, X-Ray, and Gamma

Electricity and Magnetism

100

What converts mechanical energy into electricity?

Generator

200

If one bulb goes out and makes the other lights go out, what kind of circuit is this? 

Series

300

True or false:

A series circuit needs to be closed while a parallel circuit does not

True

400

What is an electric circuit?

This system of connected wires and components allows electrical energy to flow and power devices like light bulbs and motors.

500

If you increase the number of wire turns for an electromagnet, what happens?

Increases the strength

Periodic Table and Atoms

100

What is everything made out of?

Atoms

200

What is the name of the last group on the periodic table?

Noble Gases

300

If the electrical charge of an atom is 8+, how many neutrons does it have in it's neutral state?

8

400

What element would have similar properties to Magnesium?

Any element in group 2

500

Which metal and nonmetal group is the most reactive on the periodic table?

1 and 17

Random

100

Give examples of kinetic and potential energy

kinetic - anything moving

potential - stored 

200

Draw and label a wave including

- Wavelength

- Crest

- Trough

- Amplitude

Teacher check

300

Which substance contains more than one type of atom?

Compound

400

What are the 5 chemical properties?

Flammability, reactivity, toxicity, PH level, and combustibility. 

500

Draw the phase change diagram

Teacher check