8th Grade Science Review

Peter and Naia are using this model to study eclipses and tides. How should Peter and Naia revise their model to show how solar eclipses occur?

• Place the sun inside the moon's orbit

• Place the moon between Earth and the sun

• Place Earth between the sun and the moon

• Place the moon on the opposite side of the sun

Tags

NGSS.MS-ESS1-1

I have 6 cubes made of different materials and they all have a volume of 1 cm³. The masses of each cube are:
Aluminum: 2.7g, Iron: 7.9g, Copper: 9.0g, Silver: 10.5g, Lead: 11.3g, Gold: 19.3g.
Which element has the greatest density?

• Aluminum

• Gold

• Silver

• Iron

Which statement describes a characteristic of every element in the periodic table?

• The smallest unit of every element is an atom

• Every atom has a nucleus made of protons and electrons

• Every element has neutrons in its atomic nucleus

• The smallest unit of every atom is an element

Chlorine (Cl) is a greenish-yellow corrosive gas at room temperature. Which element is similarly a pale yellow corrosive gas under the same conditions, and why?

• Aluminum, it is in the same period

• Bromine, it is about twice the mass of chlorine

• Argon, it has a similar mass

• Fluorine, it is in the same group

Naia is designing an investigation to help her identify different types of tides at the beach. What type of data should she collect periodically?

• Number of waves

• Depth of water between waves

• Distance of the water from the top of the beach

• Average height of the waves

Plant cells have chloroplasts, while animal cells do not. As a result, which of these can plant cells do that animal cells cannot?

• Plant cells can create energy through cellular respiration

• Plant cells are much more rigid to allow them to stand upright

• Plant cells can store excess amounts of water for periods of drought

• Plant cells can absorb solar energy to drive the formation of glucose

Tags

NGSS.MS-LS1-6

A student observes the two types of cells shown under a microscope. Why is this not considered a scientific experiment?

• There are no controls or variables

• It requires the use of an expensive piece of equipment

• It involves using just part of the organism instead of the whole thing

• It forces the scientist to record data in visual form instead of numerical

Tags

NGSS.MS-LS1-1

How does the body system shown work to maintain homeostasis (balance) in the body?

• It transports oxygen to the cells so they can make energy

• It brings in oxygen and removes carbon dioxide from the body

• It helps transmit danger signals that keep the body from harm

• It breaks down food to release the nutrients the body needs for growth

Tags

NGSS.MS-LS1-3

Students drew the forces acting on a skateboard. The skateboard is currently rolling to the right on a level path at a constant speed. What is a possible magnitude for Force A?

• 100 N

• 200 N

• 0 N

• 50 N

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Students are investigating static electric charges. What are possible charges for the right sphere in Part A of the diagram?

• Positive only

• Positive or negative

• Negative only

• Positive or uncharged

Tags

NGSS.MS-PS2-3