Mastering Quick Tricks for Balancing Equations

What is a common issue faced when balancing combustion equations?

• Balancing hydrogen atoms

• Balancing carbon atoms

• Balancing oxygen atoms

• Balancing nitrogen atoms

Tags

NGSS.HS-PS1-7

What are the products of a combustion reaction involving a CH or CHO compound?

• Carbon monoxide and water

• Carbon dioxide and water

• Methane and water

• Oxygen and water

In the combustion of pentane (C5H10), what are the reactants?

• C5H10 and O2

• C5H10 and CH4

• C5H10 and CO2

• C5H10 and H2O

What is the first element you should balance in a combustion reaction?

• Carbon

• Nitrogen

• Hydrogen

• Oxygen

Tags

NGSS.MS-PS1-1

What should you do if an element exists in multiple products or reactants?

• Ignore it

• Balance it last

• Balance it first

• Write it out separately

When balancing hydrogen in the combustion of pentane, what coefficient is placed in front of water (H2O)?

• 5

• 3

• 4

• 2

What is the temporary coefficient for O2 when balancing the combustion of pentane?

• 9.5

• 8.5

• 7.5

• 6.5

Tags

NGSS.HS-PS1-7

Why can't you leave a balanced equation with a decimal coefficient?

• It is not mathematically correct

• It is not chemically accurate

• It must be in the lowest whole number ratio

• It is not visually appealing

What is the final balanced equation for the combustion of pentane after converting to whole numbers?

• 2 C5H10 + 7.5 O2 → 10 CO2 + 5 H2O

• C5H10 + 15 O2 → 5 CO2 + 10 H2O

• 2 C5H10 + 15 O2 → 10 CO2 + 10 H2O

• C5H10 + 7.5 O2 → 5 CO2 + 5 H2O

Tags

NGSS.HS-PS1-4

What is the purpose of doubling all coefficients in a balanced equation?

• To simplify the equation

• To ensure the equation is in the lowest whole number ratio

• To make the equation more complex

• To balance the equation faster