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
Matter changes form, but not the chemical identity is what type of change?
What is a Physical change
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
A chemical reaction occurs and a new product is formed, is what type of change?
What is a chemical change?
How many atoms of each element are in BeCl₂?
3
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
Aluminum foil is cut in half. What type of change is this?
What is a physical Change?
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)
Cracking an egg, is what type of change?
What is a physical change?
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)
A log burns into a pile of ash, is what type of change?
What is a chemical change?
How many atoms of each element a molecules of K₂O?
3