Chemical Formulas
Look at the chemical formula. How many atoms does Hydrogen (H) have?
7C6H12O6
12 atoms
What is a Molecule?
Two or more atoms chemically combined.
What is a subscript in a chemical formula?
the number of atoms
What are the two most common elements?
Hydrogen and Helium.
Look at the chemical formula. How many molecules are in this formula?
7C6H12O6
7 molecules
A(n)_____ is the basic building block of matter.
atom
What is the coefficient in a chemical formula?
The number of molecules
Give 5 Examples of Elements.
Hydrogen, Helium, Carbon, Oxygen, Sodium, etc.
Which of these compounds contains the same number of sodium atoms?
Na2CO3
Na3OH
Na2S2O3
C7H5O2Na
1 and 3
How do you identify a Molecule?
The beginning of a chemical formula; the coefficient.
What is an Element?
A pure substance that cannot be chemically broken down.
Identify how many elements are in Fe2O3? What are those elements?
2; Iron (Fe) and Oxygen (O).
Using the given chemical formula, how many total numbers of oxygen atoms are there?
CH3CHOHCO2H
3 Oxygen atoms
Which of these compounds contains the same number of carbon atoms?
Na2CO3
NaOHC
C4Na2S2O3
C7H5O2Na
1 and 2
What is a Compound?
Two or more elements chemically combined.
What elements make up this compound?
C6H1206
Carbon (C), Hydrogen (H), Oxygen (O)
Calculate the total number of atoms in this compound:
5Na5S2O
40 atoms
Calculate the total number of atoms in this compound:
3Na2S2O3
21 atoms
Who created the first Periodic Table?
Dmitri Mendeleev
What elements make up this compound?
SO2Na3C
4; Sulfur (S), Oxygen (O), Sodium (Na), Carbon (C)