Chemical Change and Law of Conservation of Mass

Which answer shows all four signs of a chemical change?

• a gas forms, ripping, a an precipitate forms, unexpected color change

• a gas forms, a precipitate forms, an unexpected color change, and light or energy is released

• a gas forms, an unexpected color change, light or energy is released, and melting or freezing

• a precipitate forms, an unexpected color change, melting or freezing, and ripping

Tags

NGSS.MS-PS1-2

The law of conservation of mass states that ________

• the total mass of reactants is more than the total mass of products

• the mass of a chemical reaction is not constant

• the mass of a chemical reaction remains constant

• the total mass of reactants is less than the total mass of products

Tags

NGSS.MS-PS1-5

According to the law of conservation of mass, how much mercury was present in the mercury (II) oxide?

• 55.8 g

• 64.2 g

• 60.0 g

• 126.0 g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

According to the law of conservation of mass, how much zinc was present in the zinc carbonate?

• 256 g

• 88 g

• 104 g

• 40 g

Tags

NGSS.MS-PS1-5

In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.

• The total mass of the reactants is greater than the total mass of the products.

• The total mass of the reactants is less than the total mass of the products.

• Matter is not changed.
  

Tags

NGSS.MS-PS1-5

Which is the Law of Conservation of Matter?

• matter cannot be created or destroyed, it only changes form

• matter can be created but it cannot be destroyed, it never changes form

• matter can be destroyed but it cannot be created, it usually just changes form

• matter is an unproven theory created by Hans Geiger

Tags

NGSS.MS-PS1-5

Which is Chemical Equation is Balanced?

• CH₄+O₂------CO₂+2H₂O

• H₂+O₂-----2H₂O₄

• 4Al+3O₂-----2Al₂O₃

Tags

NGSS.MS-PS1-5

_________ are the substances that are produced in a chemical reaction.

• Reactants

• Producer

• Reaction

• Product

Tags

NGSS.MS-PS1-5

________ are the starting substances in a chemical equation.

• Reactants

• Producer

• Reaction

• Products

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Which chemical equation supports the law of conservation of mass?

• Equation (a)

• Equation (b)

• Equation (c)

• Equation (d)

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2