Elements, Compounds, and Chemical Formulas

The chemical formula for sodium sulfate is Na₂SO₄. How many sulfur atoms are in the formula for sodium sulfate?

• 1

• 2

• 6

• 7

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8.5D

Which of the models best represents CaCO₃?

• 
• 
• 
• 

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8.5D

How many elements are in C₆H₁₂O₆?

• 1

• 2

• 3

• 4

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8.5D

A student is studying calcium, a highly reactive element that humans need for strong bones. Which characteristic of calcium is most closely related to its chemical reactivity?

• The 20 protons in each atom of calcium

• The density of calcium

• The atomic number

• The two valence electrons in each atom of calcium

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8.5B

How many Hydrogen are in 4H₂O?

• 6
• 8
• 2
• 4

Tags

8.5D

Sodium sulfate is used in laundry detergent. It is a compound that contains 2 atoms of sodium, 1 atom of sulfur, and 4 atoms of oxygen. What is the correct chemical formula for sodium sulfate?

• NA₂SO₄

• Na₂S₂O₄

• Na₂SO₄

• Na₂SO₈

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8.5D

What combination of beads should the use to model the formula C₆H₁₂O₆? Blue represents carbon, green represent oxygen and red represent hydrogen.

• 6 blue, 6 red and 6 green

• 12 green, 6 red and 6 blue

• 12 red, 6 blue and 6 green

• 12 blue, 6 green and 6 red

Tags

8.5D

A group of students are generating a statement that accurately describes the chemical formula displayed below.

C₃H₇NO₂

What information would accurately complete the statement? Move ONE correct answer to each box.​

There are (a)   elements and​​ (b)   total atoms involved in the chemical formula displayed.

• 4
• 13
• 1
• 2
• 3
• 9
• 12
• 14

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8.5D

This appears on the left side of a chemical formula, and represents how many molecules there are. 

• An Atom
• The Subscript
• A Molecule
• The Coefficient

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8.5D

The above diagram is a model of a molecule of methane.  What is the formula for methane? 

• CH₈

• C₈H₄

• CH₄

• C₈H₈

Tags

8.5D