Counting Atoms in Chemical Formulas

The video tutorial teaches how to count atoms in chemical formulas. It covers identifying elements by capital letters, understanding subscripts, and handling formulas with parentheses. The tutorial provides examples, including CO2 and more complex formulas, to illustrate the process. It emphasizes the importance of reading questions carefully and practicing the steps to master counting atoms.

What is the first step in counting atoms in a chemical formula?

• Look for parentheses

• Identify the number of molecules

• Identify the elements by their capital letters

• Count the total number of atoms

If a chemical element has no subscript, how many atoms of that element are present?

• One

• Zero

• Three

• Two

In the formula CO2, how many oxygen atoms are present?

• One

• Two

• Three

• Four

What is the total number of atoms in the formula CO2?

• Two

• Three

• Four

• Five

When dealing with parentheses in chemical formulas, what mathematical property is applied?

• Distributive Property

• Associative Property

• Identity Property

• Commutative Property

In the formula Mg(OH)2, how many hydrogen atoms are present after applying the distributive property?

• One

• Two

• Three

• Four

In the practice example NaC2H3O2, how many total atoms are present?

• Six

• Seven

• Nine

• Eight

How many elements are present in the formula NaC2H3O2?

• Two

• Four

• Five

• Three

In the formula Al2(SO4)3, how many sulfur atoms are present after distributing the subscript?

• Two

• Three

• Four

• Six

What is the total number of atoms in the formula Al2(SO4)3?

• Eighteen

• Seventeen

• Sixteen

• Fifteen