Counting Atoms

Front

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

Back

To find the total number of atoms in a compound, add the coefficients of each element multiplied by their respective subscripts.

Front

What does the subscript in a chemical formula represent?

Back

The subscript indicates the number of atoms of the element in one molecule of the compound.

Front

In the compound 2(NH₄)CrO₄, how many nitrogen (N) atoms are present?

Back

There are 2 nitrogen (N) atoms.

Front

What is the product of the reaction 2H₂ + O₂?

Back

The product is 2H₂O.

Front

How many different elements are in the compound C₆H₁₂O₆?

Back

There are 3 different elements: Carbon (C), Hydrogen (H), and Oxygen (O).

Front

How many hydrogen (H) atoms are in the compound 4(H₂O)?

Back

There are 8 hydrogen (H) atoms.

Front

In the compound Al₂(SO₄)₃, how many oxygen (O) atoms are present?

Back

There are 12 oxygen (O) atoms.

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

Front

What does the term 'element' mean in chemistry?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

How do you determine the number of atoms of an element in a compound with parentheses?

Back

Multiply the subscript outside the parentheses by the subscripts of each element inside the parentheses.