Conservation of Mass Review

What does the law of conservation of mass state?

• Mass can disappear and reappear.

• Mass can change forms but is neither created nor destroyed.

• Mass can multiply or vanish.

• Mass can only increase.

Tags

NGSS.MS-PS1-5

Which of the following is an example of the law of conservation of mass?

• Burning wood and the total mass of ash and gases being less than the original wood.

• Melting ice and the mass of water being the same as the ice.

• Baking a cake and the mass of the cake being more than the ingredients.

• Dissolving sugar in water and the mass of the solution being less than the sugar and water.

Tags

NGSS.MS-PS1-5

What happens to the total amount of stuff when you mix things together or change them?

• It increases.

• It decreases.

• It stays the same.

• It disappears.

Tags

NGSS.MS-PS1-5

What happens to the number of Lego pieces when you build and then take apart a spaceship?

• The number of pieces increases.

• The number of pieces decreases.

• The number of pieces stays the same.

• The number of pieces disappears.

What is the difference between scientific laws and theories?

• Laws describe patterns, while theories provide deeper explanations.

• Theories describe patterns, while laws provide deeper explanations.

• Laws are always correct, while theories are always incorrect.

• Theories are more straightforward than laws.

What happens to the atoms that made up ancient plants and animals in the creation of oil?

• They disappear.

• They are rearranged into new molecules that make up oil.

• They remain unchanged.

• They turn into water.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a hypothesis?

• A proven fact.

• An educated guess that can be tested.

• A random idea.

• A law of nature.

Tags

NGSS.HS-PS1-2

What is the role of scientific laws?

• To provide deeper explanations.

• To describe patterns.

• To disprove theories.

• To create new hypotheses.

Tags

NGSS.HS-PS2-1

What is the significance of the total mass of reactants in a chemical reaction?

• It is always less than the total mass of the products.

• It is always more than the total mass of the products.

• It must equal the total mass of the products.

• It is unrelated to the total mass of the products.

Tags

NGSS.MS-PS1-5

Which of the following is an indicator of a chemical reaction?

• Change in shape

• Formation of a gas

• Melting

• Freezing

Tags

NGSS.MS-PS1-2