Counting Atoms and Balancing Chemical Equations

Chemical Reactions/Counting Atoms

Open Ended

List anything you know about atoms.

Terminology: Element

A chemical that cannot be broken down into another substance

Each unique capital letter represents a different element.

Multiple Choice

What do the CAPITAL letters represent in a molecular formula?

• molecules

• elements

• atoms

Atom

The smallest part of a chemical element.

Combining atoms creates molecules.

Multiple Choice

Combining _____ creates molecules.

• Legos

• nucleus

• atoms

Multiple Choice

How many atoms make a molecule?

• only 1

• 2 or more

Multiple Choice

How many atoms of Hydrogen are in this compound

• 1
• 2
• 3
• 4

Multiple Choice

How many atoms of Hydrogen are in H₂O

• 1

• 2

• 3

• more than 3

Multiple Choice

How many Oxygen are in H₂O?

• 1
• 2
• 0
• 4

Molecular Formula Examples

Law of conservation of matter

- Energy cannot be created or destroyed

-It can be moved from one object to another

Multiple Choice

There are 2 (O) oxygen atoms in the reactants. How many will be in the PRODUCT?

• 1

• 2

• 3

Multiple Choice

Is this equation balanced?

• yes
• no
• Not enough information
• Left side is balanced

Multiple Choice

Write the chemical formula for the picture:

• F2O

• O2F

• 2 FO

• USE YOUR NOTES

Multiple Choice

Write the chemical formula for the picture:

• N₃F

• 3 FN

• F₃N

• USE YOUR NOTES

Multiple Choice

The chemical formula is C₄H₁₀. How many HYDROGEN (H) atoms are in one molecule of this?

• 1

• 4

• 10

Multiple Choice

What is the chemical formula for this picture? (1 green circle & 4 purple circles to represent atoms).

• CH₄

• NH₃

• H₂O

Multiple Choice

How many total atoms are in the compound for ammonia, NH₃

• 2

• 3

• 4

• 5

Multiple Choice

The right side of the equation (NaCl) is called the

• product

• reactants

Multiple Choice

The ______ are numbers found on the lower right-hand side of an element symbol.

• Coefficient

• Exponent

• Multiplier

• Subscript

Multiple Choice

How many total ATOMS are shown in this picture?

• 1

• 3

• 4

Multiple Choice

How many total atoms are in H₂SO₄?

• 3

• 5

• 6

• 7

Potential &

Kinetic Energy

• https://www.youtube.com/watch?v=zCKeniklH_c

Multiple Choice

What is the definition for energy in MOTION (moving)?

• Potential energy

• Kinetic energy

Multiple Choice

A slingshot that has been pulled back, but has not been let go.

• potential

• kinetic

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Multiple Choice

An arrow is pulled back but hasn't been released from the bow yet.

• potential

• kinetic

Multiple Choice

When a roller coaster is at the top of a hill it has

• high potential energy

• high kinetic energy

• low potential energy

• equal amounts of kinetic and potential energy

Multiple Choice

A rubber band has been pulled backward but hasn’t been let go yet.

• Potential
• Kinetic

Multiple Choice

At which point is potential energy greatest?

• W

• X

• Y

• Z