25/26 Conservation of Mass in Reactions

What does the Law of Conservation of Mass state about chemical reactions?

• Mass is created during a chemical reaction.

• Mass is destroyed during a chemical reaction.

• Mass is neither created nor destroyed during a chemical reaction.

• Mass doubles during a chemical reaction.

Tags

TEKS.SCI.8.6E

If you start a chemical reaction with 10 grams of reactants, how much mass of products should you expect after the reaction, according to the Law of Conservation of Mass?

• 5 grams

• 10 grams

• 15 grams

• 20 grams

Tags

TEKS.SCI.8.6E

• 1

• 2

• 3

• 4

Tags

TEKS.SCI.8.6E

Which statement best explains why the mass of the products equals the mass of the reactants in a chemical reaction?

• Atoms are destroyed during the reaction.

• Atoms are rearranged, not created or destroyed.

• New atoms are formed during the reaction.

• Atoms disappear after the reaction.

Tags

TEKS.SCI.8.6E

• 6

• 12

• 18

• 24

Tags

TEKS.SCI.8.6E

A student mixes 5 grams of substance A with 15 grams of substance B in a closed container. After the reaction, the total mass of the container and its contents is 19 grams. What is the most likely explanation?

• Some mass was lost as energy.

• The Law of Conservation of Mass was violated.

• The container was not properly sealed, and some gas escaped.

• The measurement was incorrect.

Tags

TEKS.SCI.8.6E

A chemical equation for the reaction between calcium hydroxide Ca(OH)_2, and sulfuric acid, H₂SO₄, is shown. The masses of some of the reactants and products are given in grams.

According to the Law of Conservation of Mass, how many grams of sulfuric acid were used in this reaction?

DO NOT ADD g to answer

Mathematical Equivalence

OFF

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

Determined whether the following equation is balanced or unbalanced. Ag + O_{2 --->} 2Ag₂O

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5

Determine whether the following equations is balanced or unbalanced. H₄ + O₂ ---> 2H₂O

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5

Determine whether the following equation is balanced or unbalanced. 2Fe + 3Cl₂ ---> FeCl₃

• Balanced

• Unbalanced

Tags

NGSS.MS-PS1-5