Balancing Combustion Reactions

What is the right ratio of chemicals for the balanced chemical equation?

• 3,1 --> 2,3

• 3,2 --> 1,1

• 3,2 --> 2,4

• 3,2 --> 2,1

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO 

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Is the following equation balanced?

Al + O₂ ---> 2Al₂O₃

• YES

• NO

Tags

NGSS.HS-PS1-7

___C₃H₈ +___O₂ --> ___CO₂ + ___H₂O

• 1,5,3,4

• 2,10,6,8

• already balanced

• 1,5,5,4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

• 2

• 3

• 4

• 6

Answer explanation

To balance the equation, we need 2 molecules of CO2 to match the carbon atoms in C2H4. Therefore, the coefficient of CO2 is 2.

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.HS-PS1-7

What is the balanced equation for the combustion of methane (CH4)?

Tags

NGSS.HS-PS1-7

In the combustion of propane (C3H8), what is the coefficient of O2 in the balanced equation?

• 3

• 5

• 4

• 6

Which of the following is a balanced equation for the combustion of ethane (C2H6)?

Tags

NGSS.HS-PS1-7

What is the first step in balancing a combustion reaction?

• Balance the carbon atoms

• Balance the hydrogen atoms

• Balance the oxygen atoms

• Write the unbalanced equation