Law of Conservation of Matter

The drawing shows solid carbon dioxide changing into carbon dioxide gas. Which statement describes the relationship between the solid carbon dioxide and the carbon dioxide gas after all of the solid has changed to gas?

• They have the same volume.

• The gas has less volume than the solid.

• They have the same mass.

• The gas has less mass than the solid.

Tags

NGSS.MS-PS1-4

When heated, mercuric oxide decomposes to form liquid mercury and oxygen. A scientist heated 10 grams (g) of mercuric oxide and formed 9.3 grams of liquid mercury. How many grams of oxygen were formed?

• 0.7 g

• 9.3 g

• 10.0 g

• 19.3 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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 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.

• 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.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these does a balanced chemical equation show?

• the speed of a reaction

• elements created by a reaction

• phase changes taking place during a reaction

• the number of atoms involved in a reaction

Tags

NGSS.MS-PS1-5

When a mixture of oxygen and hydrogen is ignited in a test tube, the reaction shown occurs. What happens to the total mass of the contents of the test tube?

• The total mass increases.

• The total mass decreases.

• The total mass remains the same.

• Part of the mass is changed to heat energy.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a correctly written chemical equation that demonstrates the conservation of mass?

• Mg + HC1 --> H₂ + MgCl₂

• H₂O + CO₂ --> H₂CO₃

• KC1O₃ --> KC1 + O₂

• H₂ + O₂ --> H₂O

Tags

NGSS.MS-PS1-5

The drawing shows solid carbon dioxide changing into carbon dioxide gas. Which statement describes the relationship between the solid carbon dioxide and the carbon dioxide gas after all of the solid has changed to gas?

• They have the same volume.

• The gas has less volume than the solid.

• They have the same mass.

• The gas has less mass than the solid.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

When heated, mercuric oxide decomposes to form liquid mercury and oxygen. A scientist heated 10 grams (g) of mercuric oxide and formed 9.3 grams of liquid mercury. How many grams of oxygen were formed?

• 0.7 g

• 9.3 g

• 10.0 g

• 19.3 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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 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.

• 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.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these does a balanced chemical equation show?

• the speed of a reaction

• elements created by a reaction

• phase changes taking place during a reaction

• the number of atoms involved in a reaction

Tags

NGSS.MS-PS1-5