Mini 8th Grade Science Review

Which of the following statements about the process of science are TRUE?

• As new evidence is gathered, scientific models are refined and changed.

• When a model is supported by a lot of scientific evidence, it is usually accepted by the scientific community.

• Once something is a theory it is never changed, even if new evidence arises.

• If evidence doesn't support our hypothesis, we ignore that evidence.

Identify the subatomic particles shown in blue in the diagram.

• protons

• electrons

• neutrons

Tags

NGSS.MS-PS1-1

What are some elements of a good hypothesis?

• It answers your question.

• It's correct.

• It's based on observations, previous knowledge, and/or logic.

• It can be tested.

How does the # of bugs in a compost bin affect the time it takes for organic matter to decompose? Identify the dependent variable.

• time it takes for organic matter to decompose

• # of bugs in a compost bin

• amount of organic matter in the compost bin

• temperature and humidity around the compost bin

Tags

NGSS.MS-LS2-3

NGSS.MS-LS2-4

Silicon (atomic number = 14) is a

• metal

• nonmetal

• metalloid

Tags

NGSS.HS-PS1-1

What information do you need to calculate the density of an unknown substance?

• mass

• color

• texture

• volume

Which of these statements is TRUE about two blocks of silver that are different shapes but have the same volume?

• They have the same mass, but different densities.

• They have different masses and different densities.

• They have different masses, but the same density.

• They have the same mass and the same density.

Which of the following statements are TRUE about atoms?

• Atoms are mostly made up of empty space.

• 99% of an atom's mass is in the nucleus.

• The nucleus of an atom contains neutrons and electrons.

• The electrons in an atom are negatively charged.

Tags

NGSS.MS-PS1-1

Global warming is

• caused by excess greenhouse gases in the atmosphere.

• can be stopped and even reversed by reducing the amount of greenhouse gases in the atmosphere.

• causing earth's climates to change.

• caused by a hole in the ozone layer.

Tags

NGSS.MS-ESS2-6

NGSS.MS-ESS3-4

NGSS.MS-ESS3-5

What information can you get by examining this chemical formula, Cu(NO₃)₂(aq)

• The substance is made up of two elements.

• The substance is a solid dissolved in water.

• The substance contains copper, Cu.

• The substance is flammable.

Tags

NGSS.MS-PS1-1