8th grade Unit 2

According to the Chemical Compounds table above, how many atoms of hydrogen are in Ethanol?

• 0

• 2

• 5

• 6

According to the Chemical Compounds table above, how many total atoms are in Glucose?

• 3

• 18

• 24

• 432

Refer to the Chemical Compounds table above. How many total elements are in Ethanol? Record your answer. Be sure to use the correct place value

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

• CH₈

• C₈H₄

• CH₄

• C₈H₈

2Mg + O₂ 2MgO

In the equation above, how many atoms are in the oxygen molecule?

• 2

• 0

• 1

• 3

The formula below represents the most common carbohydrate known as glucose. It is classified as a monosaccharide. Glucose is synthesized by chlorophyll in plants as they use carbon dioxide from the air and sunlight as an energy source during the process of photosynthesis.

C₆H₁₂O₆

Which information can be determined from the chemical formula?

• The structural arrangement of the atoms in a glucose molecule

• The color of a glucose molecule

• The size of a glucose molecule

• The number of atoms of each element in a glucose molecule

Which of the above statements is true?

• I and II

• III and IV

• I and III

• II and III

Which of the following formulas contain the same number of oxygen atoms?

• Formulas I and II

• Formulas II and IV

• Formulas I, II, and III

• Formulas I, II, and IV

How many atoms are in one molecule of baking soda, NaHCO3? Record your answer. Be sure to use the correct place value.

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The chemical formula represents the substance glucose.

 

2C₆H₁₂O₆

 

How many molecules of glucose are represented?

• 2

• 6

• 12

• 24