Counting Atoms Practice - LCP 3

Hotspot

Identify the element that is in the 2nd group and 4th period

Multiple Choice

What is a chemical reaction?

• a change in matter when the molecules rearrange to make new molecules

• a change in matter when matter changes its form or appearance

• a change in matter when the physical appearance changes

• a very boring change in matter

Multiple Choice

The left side of the equation below is called

• Products
• Reactants

Multiple Choice

A substance that is formed as the result of a chemical reaction is a __________________

• Product

• Reactant

• Starters

• Enders

Multiple Choice

A ______ is a number written in front of a chemical formula.

• Coefficient

• Subscript

• Exponent

• Coordinator

Multiple Choice

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

• Coefficient

• Exponent

• Multiplier

• Subscript

Match

Match the following

• Reactant

  with a coefficient

• reactant

• Product

  with a subscript

2O₂

CH₄

CO₂

• 2O₂

• CH₄

• CO₂

Multiple Choice

The reactants in the image above are:

• CH4 and 2 O2

• 2 H2O and CO2

• All of these are reactants

• All of these are products

Multiple Choice

What does the subscript in a chemical formula tell you?

• How many molecules are present

• How many atoms are present

• How many elements are present

• How many neutrons are present

Multiple Choice

How many atoms of Hydrogen are in H₂O

• 1

• 2

• 3

• more than 3

Multiple Choice

How many Nitrogen atoms are in the in H₃C₂ON₅?

• 2

• 3

• 4

• 5

Multiple Choice

Coefficients in chemical formulas...

• Multiply just the first atom

• Add to the subscripts at the end of the molecule

• Multiply elements without subscripts

• Multiply EVERYTHING!

Drag and Drop

2 CH₂CO₃OH

Number of C: ​

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Number of H: ​

Placeholder

Number of O: ​

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Drag these tiles and drop them in the correct blank above

4

6

8

2

3

1

5

7

9

10

Multiple Choice

How many atoms of Oxygen are in Fe(NO₃)₃ ?

• 6
• 3
• 9
• 1

Match

Match the formula to the description:

• SO₃

• 2 SO₃

• 2 S₂O₃

• 3 SO₄

• SO₄

1 sulfur, 3 oxygen's

2 sulfur's, 6 oxygen's

4 sulfur's, 6 oxygen's

3 sulfur's, 12 oxygen's

1 sulfur, 4 oxygen's

• 1 sulfur, 3 oxygen's

• 2 sulfur's, 6 oxygen's

• 4 sulfur's, 6 oxygen's

• 3 sulfur's, 12 oxygen's

• 1 sulfur, 4 oxygen's