Physical Science CP
Seton Hall Preparatory School
Mr. Greene
Composition of Matter HW 1 (Due 2/16)
Name _______________________________________
1. For the following chemical equations, determine the number of atoms for each element on either side;
a. C3H8 + 5O2  4H2O + 3CO2
b. 3H2SO4 + 2Fe  Fe2(SO4)3 + 3H2
2. Determine the number of atoms/molecules found in the following;
a. 4.7 mols CH4
b. 0.036 mol Zn
3. 2.71*1025 atoms of C are equivalent to how many mols of C?
4. What does an element’s atomic number represent? Using the periodic table posted to the Google Doc,
determine the atomic numbers of the following; Ir, Mg, Xe, N, Fe, U, Li, K, and Br
5. Describe, in detail, what occurs during a chemical reaction