Chemical Reaction Types and Balancing

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

Why is the following chemical equation not balanced?
H_{2 +} O₂ --> H₂O

• each side of the equation has a different number of oxygen atoms

• each side of the equation has a different number of hydrogen atoms

• each side has the same mass

Tags

NGSS.MS-PS1-5

Balance this equation
_Al +_HCl --> _H₂ +_AlCl₃

• 2, 6, 3, 2

• it is already balanced

• 4, 12, 3, 4

• 2, 1, 4, 5

Tags

NGSS.MS-PS1-5

Balance this equation-
__P₄ + __O₂ --> __P₂O₃

• it is already balanced

• 2, 1, 3

• 1, 2, 3

• 1, 3, 2

Tags

NGSS.MS-PS1-5

What is the part of a chemical equation called...
2H_{2 +} O₂--> 2H₂O

• Reactants

• Products 

• Yields 

• Chemical Equation 

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

Which type of reaction has only one reactant?

• synthesis

• Double replacement

• Chemical reaction

• decomposition

4Si + S₈ --> 2Si₂S₄

_{What type of reaction is this?}

• Synthesis

• Decomposition

• Single displacement

• Double displacement

Tags

NGSS.MS-PS1-5

N₂ --> Mg₃N₂

_{What type of reaction is this?}

• Synthesis

• Decomposition

• Single displacement

• Combustion

What type of reaction is this?

P₄ + 3O₂ --> 2P₂O₃

• Synthesis

• Decomposition

• Single displacement

• Combustion