Counting Atoms
In the formula H2O, how many hydrogen atoms are present?
2
What is the name of the element represented by Na?
Sodium
Write the chemical formula for water.
H2O
What element is K
Potassium
What is the total number of atoms in the formula C3H8?
11 (3 carbon + 8 hydrogen)
What is the chemical name for H2SO4?
Sulfuric acid
If a molecule contains 3 carbon atoms and 8 hydrogen atoms, what is its formula?
C3H8
What element is Br
Boron
In the compound NaCl, how many total atoms are there?
2 (1 sodium + 1 chlorine)
Name the compound Fe2O3.
Iron(III) oxide
Create the formula for a compound made of 1 sodium atom and 1 chlorine atom.
NaCl
What element is Fe
Iron
In the formula C5H12OC5H12O, how many hydrogen atoms are present?
12
What is the name of NH3?
Ammonia
From the word problem, "A molecule contains 2 nitrogens and 4 hydrogens," write the formula.
N2H4
What element is Ag
Silver
Analyze the formula Ca(NO3)2 and determine the total number of oxygen atoms.
6
(2 x 3 = 6 from the nitrate group)
What is the systematic name for PbCl2?
Lead(II) chloride
A compound contains 1 calcium atom, 2 nitrogen atoms, and 6 oxygen atoms. Write the formula.
Ca(NO3)2
What element is Au
Gold