P.1.4 Test

Which chemical reaction supports the law of conservation of mass?

• H₂O → H₂ + O₂

• H₂O → 2H₂ + O₂

• H₂O → H₂ + 2O₂

• 2H₂O → 2H₂ + O₂

Tags

NGSS.MS-PS1-5

How many methane (CH4) molecules would be needed to produce 13 carbon dioxide (CO2) molecules?

CH₄ + 2O₂ → CO₂ + 2H₂O

• 4

• 13

• 26

• 52

Tags

NGSS.MS-PS1-5

A 12-gram sample of magnesium (Mg) reacts with an 18-gram sample of sulfur (S) when heated. Magnesium sulfide (MgS), a solid crystalline material, is formed. What mass of MgS is most likely produced?

• 6 grams

• 30 grams

• 60 grams

• 216 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• 6 atoms of carbon

• 3 atoms of carbon

• 2 atoms of carbon

Tags

NGSS.MS-LS1-6

NGSS.MS-PS1-5

When 15 grams of zinc are combined with 20 grams of hydrochloric acid, two new products are created. What will be the combined weight of the products?

• 5 grams

• 15 grams

• 20 grams

• 35 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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, matter is destroyed.

• During a chemical reaction, one or

• During a chemical reaction, the total number of atoms increases.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If 100 grams of vinegar and 5 grams of baking soda are poured in a container, a small amount of gas will be produced. What will the final mass of the products be if the gas is trapped in the container?

• 100 grams

• 104 grams

• 105 grams

• 110 grams

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is true of mass during a chemical reaction?

• Mass increases

• Mass decreases

• Mass stays the same

• Mass depends on the chemicals involved

Tags

NGSS.MS-PS1-5

When chemicals react in a closed container, which must be true?

• The mass both before and after the reaction is the same.

• The mass both before and after the reaction is variable.

• The same number of compounds is present both before and after the reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is best represented by the equation?

2Mg + O₂ —> 2MgO

• The Law of Conservation of Mass

• The Law of Conservation of Energy

• The Law of Superstition

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5