Balancing and Identifying Chemical Equations

Balance this equation-
__P₄ + __O₂ --> __P₂O₃

• it is already balanced

• 2, 1, 3

• 1, 2, 3

• 1, 3, 2

Tags

NGSS.MS-PS1-5

Balance this equation.
_CF₄ + _Br₂ -- _CBr₄ + _F₂

• 2,1,2,1

• 1,2,2,1

• 1,2,1,2

• 2,2,2,2

Tags

NGSS.MS-PS1-5

At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?

• the product is doubled

• the product is half the mass of the reactants

• the mass is the same

• the mass changes depending on the reaction

Tags

NGSS.MS-PS1-5

What type a reaction is taking place in this picture?

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

To balance an equation you should:

• ONLY change subscripts.

• ONLY change coefficients.

• Change BOTH subscripts and coefficients.

3Mg + N₂ --> Mg₃N₂

• Synthesis

• Decomposition

• Single replacement

• Double replacement

Balance the following:

____ Fe + ____ Cl₂ → ____ FeCl₃

• 1,1,2

• 1,3,1

• 2,2,3

• 2,3,2

Tags

NGSS.MS-PS1-5

Balancing the following:

____ Al + ____ HCl → ____ AlCl₃ + ____ H₂

• 1,3,1,2

• 2,3,2,3

• 2,6,2,3

• 3,2,6,2

Tags

NGSS.MS-PS1-5

Why must the number of atoms on either side of the arrow be equal to each other in a chemical equation?

• to abide by the law of conservation of energy

• to abide by law of conservation of mass

• to abide by the law of fundamental equations

• because everything must be even for the universe to stay in balance

Tags

NGSS.MS-PS1-5

The number of atoms you begin with in a chemical reaction ...

• must be the same as the number of  atoms you end with

• must be an even number

• can be different to the number you finish with

• changes depending on how much energy is formed

Tags

NGSS.MS-PS1-5