8.P.1.3 8.P.1.4

According to the Law of Conservation of Mass, what happens to the wood and oxygen when it is burned?

• The wood disappears.

• It stays the same chemically.

• The atoms in the wood and oxygen rearrange and form smoke and ash.

• Nothing.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical reaction separates water into hydrogen gas and oxygen gas. Which of the following statements is true about the mass of the water and the combined mass of the two gases?

• The mass of the water is greater than the combined mass of the two gases.

• The combined mass of the two gases is much greater than the mass of the water.

• The combined mass of the two gases is the same as the mass of the water.

• The mass of the water is the same as double the combined mass of the two gases.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃

• 4Fe + 3O₂ -> 2Fe₂O₃

• 2 Fe + 3O₂ -> Fe₂O₆

• 4 Fe + O₆ -> 2Fe₂O₃

• None of the options are correctly balanced.

Tags

NGSS.MS-PS1-5

Which of the following describes a solid produced when two liquids react during a chemical reaction?

• Precipitate

• Reactant

• Solute

• Acid

The Law of Conservation of Mass says that matter can neither be __________ or __________.

• created; destroyed

• recycled; renewed

• subtracted; added

• joined; separated

Tags

NGSS.MS-PS1-5

How many atoms of Iron are in this compound?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

How many total POTASSIUM atoms are in this formula?

• 8

• 2

• 4

• 12

Tags

NGSS.MS-PS1-1

Sodium sulfate and barium chloride react with each other to form sodium chloride and barium sulfate as shown. Which statement MOST accurately describes the mass of the reactants compared to the mass of the products?

• The reactants have a greater mass because some of the mass was converted to heat.

• The reactants have a greater mass because some matter was destroyed by the reaction.

• The mass of the reactants is the same as the mass of the products.

• The products have a greater mass because matter was created during the reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which set of coefficients will balance this chemical equation?

• 1,2

• 1,3

• 2,2

• 2,3

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How does the concept of conservation of mass apply to chemical reactions?

• The reactants and products have exactly the same atoms.

• The reactants and products have exactly the same molecules.

• The change in the amount of matter is equal to the change in energy.

• The change in the amount of matter is only a small percentage of the total mass.

Tags

NGSS.MS-PS1-5