NC Chemistry

Which is the best example of a pure substance?

• peanuts

• gold

• water

• carbon dioxide

Which 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 atomic number from left to right

• decreasing atomic mass 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 complete stop

Tags

NGSS.MS-PS1-4

Which best explains why the total mass of the products would be less than the total weight of the reactants after a chemical reaction?

• Gases were released into the atmosphere.

• Precipitates were created in the new solution.

• because molecules were destroyed during the reaction

Tags

NGSS.MS-PS1-5

Which pair of elements has the most similar properties?

• Al and F

• N and P

• N and C

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)

• it depends on the type of reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The table shows properties of several elements. Which element would Element X most likely be groups with on the periodic table?

• potassium

• copper

• calcium

• chlorine

Tags

NGSS.MS-PS1-2

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

• boiling water and shredding paper

• freezing water and burning coal

• burning paper and baking a cake

• crushing a can and breaking a stick in half

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, one or more new substances are formed

• nothing happens during a chemical reaction

Tags

NGSS.MS-PS1-5

What characteristic of aluminum allows it to be made into aluminum foil?

• It is dense

• It is malleable

• it is magnetic

• it is ductile