Chemical Equations Oct. 12 P6

Open Ended

BELL RINGER:

If you burn a piece of paper, is there more or less mass then when you started? Why?

(Hint: The Law!)

Law of Conservation of Mass

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Definition: Matter(atoms) canneitherbecreatednor
destroyed.

-

Atoms can only be rearranged.

-

How does this law relate to the glowsticks?

Multiple Choice

What is the Law of Conservation of Mass?

• It states that matter cannot be created or destroyed.

• It states that energy cannot be created or destroyed.

• It states that matter can be created or destroyed.

• It states that sound can be created or destroyed.

Chemical Equation

●Broken into 3 main

parts

●Reactants

●Arrow = Chemical

Reaction

●Products

Balancing Chemical Equations

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Reactants

Product

Arrow

2H2+ O2→ 2 H2O

Multiple Choice

What is the right part of a chemical equation called...
2H_{2 +} O₂ --> 2H₂O

• Reactants
• Products 
• Yields 
• Chemical Equation 

Multiple Choice

What is the part of the chemical equation in green called? 
Fe + S --> FeS

• products
• reactants
• yield
• chemical formula

Balancing Chemical Equations

© KeslerScience.com

H2O

H

H

O

H

H

O

2
Review:

●Subscripts describe the # of

atoms in a molecule

●H2O Model

●The Coefficient represents the

number of molecules

●2 Molecules of H2O

Multiple Choice

Element or compound?
H₂O

• element
• compound

Multiple Choice

How many Hydrogen (H) atoms are in NH₃O5

• 3
• 4
• 5
• 1

Multiple Choice

How many molecules of Carbon are in the following formula? 3C₂H₆

• 3
• 6
• 12
• 18

Multiple Choice

How many elements are in C₆H₁₂O₆?

• 1
• 2
• 3
• 4

Multiple Choice

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

• 4

• 1

• 3

• 12

Multiple Choice

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

• 4

• 1

• 3

• 12

Balanced Chemical Equation

A chemical equation is balanced (equal) if the number of atoms is equal on both sides of the equation.

Multiple Choice

Is this equation balanced?

• Yes

• No

Multiple Choice

Is this equation balanced?

• Yes

• No

Multiple Choice

Is this equation balanced?

• Yes

• No

Complete the Balanced Practice (Paper)

Poll

Turn Your Paper in to Mrs. Switalski.

How do you feel about your understanding of chemical equations so far?

• 😁

  Great! I could teach someone else

• 🙂

  Good, I know enough for myself

• 😕

  Ok, I might need help still

• 😵‍💫

  Bad, I don't understand at all!

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