Basic Concepts
What is an atom?
The smallest unit of an element that retains the properties of that element.
What is the chemical symbol for Oxygen?
O
How many hydrogen atoms are in H₂O?
2
What is the total number of atoms in 2H₂O?
6 (H = 4, O = 2)
How many atoms of each element are in CaF₂?
Ca = 1, F = 2
What is a molecule?
A group of two or more atoms bonded together.
What is the chemical symbol for Hydrogen?
H
How many carbon atoms are in C₆H₁₂O₆?
6
How many atoms are in 3NaCl?
6 (Na = 3, Cl = 3)
How many atoms of each element are in 2BeCl₂?
Be = 2, Cl = 4
What does a chemical formula represent?
Information about the number and type of atoms in a molecule.
What is the chemical symbol for Chlorine?
Cl
How many sulfur atoms are in H₂SO₄?
1
Identify the number of each element in 2Ca(OH)₂.
Ca = 2, O = 4, H = 4
Identify the number of each atom in one molecule of H₃PO₄.
H = 3, P = 1, O = 4
How does a subscript in a chemical formula function?
It indicates the number of atoms of the element present.
What is the chemical symbol for Sodium?
Na
How many atoms of each element are in Na₃PO₄?
Na = 3, P = 1, O = 4 (Total = 8 atoms)
Identify the number of each element in 4K₃PO₄.
K = 12, P = 4, O = 16
Determine the total number of atoms in one molecule of (NH₄)₂SO₄.
N = 2, H = 8, S = 1, O = 4
What is the difference between a molecule and a compound?
A molecule is two or more atoms bonded together, while a compound is a molecule that contains at least two different elements.
What is the chemical symbol for Iron?
Fe
How many atoms of each element are in NH₄NO₃?
N = 2, H = 4, O = 3 (Total = 9 atoms)
Identify the number of each element and total number of atoms in 3Mg(NO₃)₂.
27 (Mg = 3, N = 6, O = 18)
How many atoms of each element are there in 4 molecules of K₂O?
K = 8, O = 4