09. Balancing Equations

How many Hydrogen are in 4 H₂O?

• 6
• 8
• 2
• 4

Which of the following reactions is balanced?

• 2CH₄ + O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + H₂O
• CH₄ + 2O₂ -> CO₂ + 2H₂O
• None of the chemical equations are balanced.

What does the number ₃ represent in 4 NH₃?

• subscript

• superscript

• coefficient

• mass number

What does the number 4 represent in 4 NH₃?

• subscript

• superscript

• coefficient

• mass number

How many Nitrogen (N) atoms are in 4 NH₃?

• 4

• 1

• 3

• 12

How many Hydrogen (H) atoms are in 4 NH₃?

• 4

• 1

• 3

• 12

How many total molecules is 4 NH₃?

• 4

• 1

• 3

• 12

What is a chemical equation?

• Describes the number of elements in a compound.

• One or two letters that represent the elements on the periodic table.

• The number to the lower right of an element that shows the number of atoms bonded.

• A written description of a chemical reaction.

____ are the new substances formed after a chemical reaction.

• Products

• Coefficients

• Subscripts

• Reactants

Why do chemical reactions happen?

• To form new substances

• To become more stable or have more disorder

• To store potential energy

• To make or break bonds