Balancing Chemical Equations

How many molecules are in this chemical formula?

• 5 molecules

• 4 molecules

• 2 molecules

• 6 molecules

Answer explanation

Remember, the coefficient tells you how many molecules there are, and the subscript tells you how many atoms there are per molecule!

Tags

formulas

How many Iron (Fe) atoms are in this chemical formula?

• 2 iron atoms

• 6 iron atoms

• 5 iron atoms

• 4 iron atoms

Answer explanation

Remember, the coefficient tells you how many molecules there are, and the subscript tells you how many atoms there are per molecule!

Tags

formulas

How many oxygen atoms are in this chemical formula?

• 6 oxygen atoms

• 2 oxygen atoms

• 3 oxygen atoms

• 4 oxygen atoms

Answer explanation

Remember, the coefficient tells you how many molecules there are, and the subscript tells you how many atoms there are per molecule!

Tags

formulas

Match the following symbols to their meaning.

• and or reacts with

• reversible reaction

• yields or produces

Tags

formulas

Match the following to their meaning.

• liquid

• (g)

• solid

• (s)

• aqueous

• (aq)

• gas

• (l)

When balancing an equation, you can change the ​ (a)   of a substance, but you cannot adjust any ​​ (b)   because that would change the formula.

• coefficient
• subscript

Tags

NGSS.MS-PS1-5

In a chemical equation, the arrow points towards the ​ (a)   of the reaction.

• products
• reactants
• elements
• compounds

Tags

NGSS.MS-PS1-5

• 2
• 1
• 3
• 4
• 5

Tags

NGSS.MS-PS1-5

• 1
• 3
• 2
• 4
• 5

Tags

NGSS.MS-PS1-5

Match the following types of chemical equations to the description that best fits them.

• Shows only the formulas of the substances involved in the reaction.

• Word Equation

• Shows the formulas of the substances involved AND their relative amounts.

• Balanced Equation

• Describes the reaction with only words

• Skeleton Equation