8th grade 4/19-4/20 EOC

Which of these formulas contain equal numbers of nitrogen atoms?

• Formulas I and III

• Formulas I and IV

• Formulas I, II and V

• Formulas II and III

How many atoms are represented in the reactants in the equation?

• 6

• 7

• 4

• 5

How many elements are represented in the products in the equation?

• 2

• 3

• 4

• 5

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

• 1

• 2

• 6

• 7

How many atoms of oxygen are in a molecule of glucose (C₆H₁₂O₆)?

• 4

• 6

• 12

• 24

What combination of beads should the use to model the formula? 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

Which of the models best represents CaCO₃?

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