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

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.

The chemical formula represents the substance glucose.

 

2C₆H₁₂O₆

 

How many molecules of glucose are represented?

• 2

• 6

• 12

• 24