NC 8.P.1

Which is the best example of a pure substance?

• peanuts

• milk

• gold

• air

Which statement best explains how periods on the periodic table are organized?

• increasing atomic number from left to right

• increasing number of neutrons from left to right

• decreasing number of electrons from left to right

• decreasing atomic mass number from left to right

An ice cube is put into a heated pan. What will most likely happen to the molecules in the ice as the ice is heated?

• The molecules will begin to move slower.

• The molecules will begin to move faster.

• The molecules will begin to increase in density.

• The molecules will begin to condense in the air.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which best explains why the total mass of the product(s) would be less than the total weight of the reactant(s) after a chemical reaction?

• A physical change occurred.

• Atoms involved in the reaction lost mass.

• Precipitates were created in the new solution.

• Gases were released to the atmosphere.

Tags

NGSS.MS-PS1-5

What happens to water molecules during the boiling process?

• They move faster and move farther apart as they absorb heat.

• They move faster and remain close together as they absorb heat.

• They move more slowly but move farther apart as they lose heat.

• They move faster and move farther apart as they lose heat.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Which pair of elements has the most similar properties?

• Li and B

• I and Ca

• K and He

• N and P

If a chemical reaction such as photosynthesis begins with 6 atoms of carbon (C), how many atoms of carbon (C) should be in the products?

• 12 atoms of carbon (C)

• 6 atoms of carbon (C)

• 3 atoms of carbon (C)

• 2 atoms of carbon (C)

Tags

NGSS.MS-PS1-5

Which element would Element X most likely be grouped with on the periodic table?

• calcium

• chlorine

• copper

• potassium

Which shows one example of a physical change and one example of a chemical change?

• boiling water and melting wax

• rusting iron and baking a cake

• dissolving powder and shredding paper

• freezing water and burning coal

Tags

NGSS.MS-PS1-2

How does a balanced chemical equation satisfy the Law of Conservation of Mass?

• During a chemical reaction, the total amount of matter stays the same.

• During a chemical reaction, matter is destroyed.

• During a chemical reaction, one or more new substances are formed.

• During a chemical reaction, the total number of atoms increases.

Tags

NGSS.MS-PS1-5