Counting Atoms

How many total atoms are in the compound 3(NH₄)₂CrO₄?

• 20

• 22

• 24

• 26

How do you calculate the total number of atoms in a compound?

• Multiply the number of atoms of each element together.

• Add the number of atoms of each element together.

• Subtract the number of atoms of each element from the total.

• Divide the number of atoms of each element by the total number of elements.

What is the chemical formula for sodium carbonate?

• NaCl

• Na₂CO₃

• K₂CO₃

• CaCO₃

How many different elements are present in the compound C₆H₁₂O₆?

• 2 (Carbon, Hydrogen)

• 3 (Carbon, Hydrogen, Oxygen)

• 4 (Carbon, Hydrogen, Oxygen, Nitrogen)

• 1 (Carbon)

What is the total number of atoms in the compound C₆H₁₂O₆?

• 20

• 22

• 24

• 26

What is the total number of elements in the compound C₂H₈O?

• 2 (Carbon, Hydrogen)

• 3 (Carbon, Hydrogen, Oxygen)

• 4 (Carbon, Hydrogen, Oxygen, Nitrogen)

• 5 (Carbon, Hydrogen, Oxygen, Sulfur, Phosphorus)

What is the role of coefficients in a chemical formula?

• Coefficients indicate the temperature of the reaction.

• Coefficients indicate how many molecules of the compound are present.

• Coefficients represent the mass of the compound.

• Coefficients show the color of the compound.

What does the subscript in a chemical formula indicate?

• The type of element in the compound.

• The number of atoms of the element in one molecule of the compound.

• The total number of molecules in the compound.

• The charge of the element in the compound.

In the compound C₂H₈O, how many hydrogen atoms are there?

• 6

• 7

• 8

• 9

How many elements are in the compound C₂H₈?

• 2 (Carbon, Hydrogen)

• 3 (Carbon, Hydrogen, Oxygen)

• 4 (Carbon, Hydrogen, Nitrogen, Oxygen)

• 1 (Carbon)