Counting Atoms & Balancing Equations

Counting Atoms & Balancing Equations

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Separate your numbers with a comma.

In the atomic model diagram:

How many atoms?

How many elements?

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What is the chemical formula for this atomic model diagram?

This formula should be familiar to you.

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In the atomic model diagram, how many of each?

Separate your answers with a comma and a space.

Multiple Choice

The law of conservation of mass states that

• chemical reactions change mass.

• in chemical reactions, the identity of reactants and products is conserved.

• atoms are neither created nor destroyed in chemical reactions.

• a chemical equation must be balanced.

Multiple Choice

What is a coefficient?

• The small number on the bottom right of the chemical symbol.

• The large number to the left of a formula.

Multiple Choice

2H₂ + O₂ ----> 2H₂O

What is the product?

• ------>

• 2H₂O

• 2H₂+ O₂

Multiple Choice

What is the part of the chemical equation in green called?

Fe + S --> FeS

• products

• reactants

• yield

• chemical formula

Multiple Choice

How many Hydrogen are in 4H₂O?

• 6

• 8

• 2

• 4

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Let's practice balancing an equation.

Do the work on your paper.

Put your coefficients separated by commas and spaces. Use a "1" for molecules that do not need changing.

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Try another. Same process.

Separate your coefficients with a comma and space.

Use a "1" for coefficients that do not need a change.

Fill in the Blank

Try another. Same process.

Separate your coefficients with a comma and space.

Use a "1" for coefficients that do not need a change.

Multiple Choice

Is this balanced?...
Al + O₂ --> 2Al₂O₃

• Yes!

• NO!

Multiple Choice

Is the following equation balanced or unbalanced?
Fe + S --> FeS

• balanced

• unbalanced

Multiple Choice

Is this equation balanced?

• yes

• no

• Not enough information