Chemical Formulas and Atom Counting

Mr. Bay's tutorial covers identifying chemical formulas using ball-and-stick models. It begins with basic identification of carbon and hydrogen, progresses to phosphorus and hydrogen, and advances to more complex formulas involving chlorine, fluorine, and bromine. The final stage involves writing chemical formulas from models, emphasizing correct notation without unnecessary numbers.

What does the letter 'C' represent in chemical formulas?

• Copper

• Calcium

• Carbon

• Chlorine

How many hydrogen atoms are represented in the formula CH4?

• 1

• 2

• 3

• 4

In a chemical formula, where is the number of atoms for an element typically written?

• To the left of the element

• Above the element

• To the right of the element

• Below the element

What is the correct formula for a compound with one phosphorus and three hydrogens?

• HP3

• H3P

• P3H

• PH3

In stage two, what is the correct formula for a compound with one carbon, one hydrogen, and three chlorines?

• CCl3H

• C3HCl

• CHCl3

• CH3Cl

Which element is represented by the symbol 'F' in chemical formulas?

• Francium

• Phosphorus

• Iron

• Fluorine

What is the correct formula for a compound with one carbon, three hydrogens, and one bromine?

• H3CBr

• CBr3H

• CH3Br

• BrCH3

In stage four, how many hydrogen atoms are in the formula C2H6?

• 8

• 6

• 4

• 2

What should you avoid typing when there is only one atom of an element in a chemical formula?

• The number 0

• The element symbol

• The number 1

• The number 2

What is the correct formula for a compound with one nitrogen and three hydrogens?

• N3H

• H3N

• NH

• NH3