7th Grade Elements vs. Compound Vocab Quiz

What are elements?

What is a compound?

Count the number of atoms in the formula CuSO4 using the subscript. Fill in the blank with the total number of atoms.

Count the number of atoms in the formula C4H10 using the subscript. Fill in the blank with the total number of atoms.

• 14

• 12

• 16

• 18

How many atoms of Oxygen (O) are present in Aluminum Sulfate?

• 12

• 6

• 4

• 8

To find the total number of atoms, what is the first step you should take?

• Count the number of each type of atom in the formula

• Multiply the number of molecules by Avogadro's number

• Add the atomic masses of all atoms

• Divide the total mass by the molar mass

In the chemical formula 2H₂SO₄, what does the subscript '2' next to hydrogen (H) indicate?

• The subscript '2' indicates that there are two atoms of hydrogen (H) in the chemical formula 2H₂SO₄.

• The subscript '2' indicates that there are two molecules of sulfuric acid.

• The subscript '2' indicates that there are two atoms of sulfur (S) in the chemical formula.

• The subscript '2' indicates that there are two atoms of oxygen (O) in the chemical formula.

What is the total number of atoms in the chemical formula Na₂CO₃?

• 6

• 5

• 7

• 8

In the formula CH₄, what does the subscript '4' next to hydrogen (H) signify?

• There are four molecules of methane.

• There are four atoms of hydrogen (H) in the molecule.

• There are four atoms of carbon (C) in the molecule.

• There are four atoms of oxygen (O) in the molecule.

How many Hydrogen atoms are in 4H₂O?

• 6

• 8

• 2

• 4