Balancing Notes- C.C.

What will students learn to describe in this lesson?

• The Law of Conservation of Energy

• The Law of Conservation of Mass

• The Law of Multiple Proportions

• The Law of Definite Proportions

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is another objective for students in this lesson besides describing the Law of Conservation of Mass?

• Balance mathematical equations

• Balance chemical equations

• Write chemical formulas

• Understand atomic theory

Tags

NGSS.MS-PS1-1

What do chemical equations represent?

• Physical changes

• Chemical reactions

• Biological processes

• Mathematical problems

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens to atoms and bonds during a chemical reaction?

• Atoms are removed and no new bonds are formed.

• Atoms remain unchanged and existing bonds are strengthened.

• Bonds are broken, atoms are rearranged, and new bonds are formed.

• Atoms and bonds are not affected in a chemical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Refer to the diagram below to answer: What does the diagram illustrate about a chemical reaction?

• Conservation of mass

• Change in physical state

• Rearrangement of atoms and formation of new products

• The creation of new elements

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the Law of Conservation of Mass state about the mass of reactants and products in a chemical reaction?

• The mass of the reactants is always more than the mass of the products.

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

• The mass of the reactants must equal the mass of the products.

• The mass of the products is not related to the mass of the reactants.

Tags

NGSS.MS-PS1-5

According to the Law of Conservation of Mass, what happens to atoms during a chemical reaction?

• Atoms are created.

• Atoms are destroyed.

• Atoms are neither created nor destroyed.

• Atoms are converted into energy.

Tags

NGSS.MS-PS1-5

What must be adjusted in a chemical equation to comply with the Law of Conservation of Mass?

• The types of reactants and products

• The amounts of reactants used and products formed

• The physical states of reactants and products

• The temperature at which the reaction occurs

Tags

NGSS.MS-PS1-5

What is the process of adjusting the amounts of reactants and products in a chemical equation called?

• Reacting the equation

• Balancing the equation

• Solving the equation

• Completing the equation

Tags

NGSS.MS-PS1-5

How is a chemical equation typically balanced?

• By changing the subscripts of the chemical formulas

• By adding catalysts to the reaction

• By inserting coefficients into the equation

• By altering the chemical properties of reactants

Tags

NGSS.MS-PS1-5