Counting Atoms and Chemical Formulas in Molecules

The video tutorial covers the basics of counting atoms in chemical formulas. It starts with a water molecule, explaining the significance of subscripts in indicating the number of atoms. The tutorial then moves to diatomic oxygen and carbon dioxide, highlighting the absence of subscripts for single atoms. It further explores glucose, emphasizing the role of subscripts in counting atoms. Iron pyrite and quartz are discussed with a focus on coefficients indicating multiple molecules. Finally, the tutorial examines baking soda, reinforcing the concept of counting atoms and understanding molecule numbers.

What does the subscript '2' in H2O indicate?

• Two oxygen atoms

• Two elements present

• Two water molecules

• Two hydrogen atoms

In a chemical formula, what does it mean if an element has no subscript?

• There are two atoms of that element

• There is one atom of that element

• The element is not present

• The element is a gas

How many elements are present in a glucose molecule?

• Five

• Two

• Three

• Four

What does the chemical symbol 'Fe' represent?

• Sulfur

• Iron

• Fluorine

• Silicon

In the formula FeS2, how many sulfur atoms are present?

• One

• Four

• Three

• Two

What does a coefficient in front of a chemical formula indicate?

• The charge of the molecule

• The type of elements present

• The number of molecules present

• The number of atoms in a molecule

How many silicon atoms are in two SiO2 molecules?

• Three

• One

• Four

• Two

In the formula NaHCO3, which element has a subscript?

• Sodium

• Hydrogen

• Carbon

• Oxygen

How many oxygen atoms are in a single NaHCO3 molecule?

• One

• Two

• Three

• Four

If a chemical formula has no number in front, how many molecules are present?

• Two

• Four

• One

• Three