Counting Atoms

In the compound C₆H₁₂O₆, how many hydrogen atoms are there?

• 10

• 12

• 14

• 8

How many different elements are in H₂C₂H₃O₂?

• 2

• 3

• 4

• 5

What is the formula for calculating the total number of atoms in a compound?

• Add the subscripts of all elements.

• Multiply the subscripts of all elements.

• Count the number of elements in the compound.

• Add the atomic numbers of all elements.

What is the significance of subscripts in chemical formulas?

• They indicate the number of atoms of each element in a compound.

• They represent the charge of the elements in the compound.

• They show the state of matter of the compound.

• They indicate the temperature at which the compound is stable.

What is the term for a substance made of two or more different elements?

• Element

• Compound

• Mixture

• Solution

What does the term 'molecular formula' refer to?

• A formula that shows the number of each type of atom in a molecule.

• A formula that indicates the molecular weight of a compound.

• A formula that describes the physical state of a substance.

• A formula that represents the structural arrangement of atoms in a molecule.

How many aluminum atoms are in Al₂O₃?

• 1

• 2

• 3

• 4

If there is no subscript in a chemical formula, how many atoms of that element are present?

• 0

• 1

• 2

• 3

In the formula NaCl, how many sodium and chlorine atoms are present?

• 1 sodium and 2 chlorine atoms.

• 2 sodium and 1 chlorine atom.

• 1 sodium and 1 chlorine atom.

• 2 sodium and 2 chlorine atoms.

What is the chemical formula for aluminum oxide?

• AlO₃

• Al₂O₃

• Al₃O₂

• Al₂O₄