Chemistry Assignment
1. State how each of the following variables effect equilibrium:
a) Temperature
b) Concentration
c) Pressure
2. Examine the following exothermic reaction:
_C6H12O6(s) + _O2(g)  _CO2(g) + _H2O(g)
a)
b)
c)
d)
e)
balance the reaction
If the temperature is decreased, what will happen to the equilibrium?
What will happen to the equilibrium if you add more O2?
If the pressure is increased, what will happen to the equilibrium?
If the temperature is increased, what will happen to the equilibrium?
3. Examine the following endothermic reaction:
_CO(g) + _O2(g)  _CO2
a) balance the reaction
b) If the temperature is increased, what will happen to the equilibrium?
c) What will happen to the equilibrium if you add more O2?
d) If the pressure is increased, what will happen to the equilibrium?
e) If the temperature is decreased, what will happen to the equilibrium?
4. How can we tell just by looking at a chemical reaction that it is in equilibrium?
5. Circle and match up the conjugate pairs in each of the following reactions. Also, identify the
conjugate acid and base in each conjugate pair.
a) N2H4 + H2O  N2H5+1 + OH-1
b) H2CO3 + H2O 3O+1 + HCO3-1
6. Complete and balance the following chemical equations.

a. Sr(OH)2 


b. HC3H5O2 + H2O
c. Fe + HCl 


d. HCl + H2O 
e. Al(OH)3 


f. H2CO3 + NaOH 

The reaction below is an exothermic reaction from left to right. Is the reverse reaction also
exothermic? Explain.

NH3 + H2O NH4+1 + OH-1
BLASTS FROM THE PAST!!! Questions from previous topics!
8. Of the following pairs of elements, circle the element with the electronegativity.
a)
b)
c)
d)
Sodium and Chlorine
Lithium and Francium
Iron and Bromine
Fluorine and Astatine
e) Sulfur and Tin
f) Sodium and Bromine
g) Chlorine and Francium
h) Carbon and Astatine
8. Where on the periodic table are the metals and nonmetals found? List 4 of each.
9. From each of the following pairs of elements, circle the element with the atomic number.
a. Lithium and Oxygen
b. Sodium and Francium
c. Sodium and Magnesium
d. Potassium and Bromine
10. Balance the following equations as indicated.
a. __ AlF3 + __ Mg3N2  __ AlN + __ MgF2
b. __ C4H8 + __ O2  __ CO2 + __ H2O
c. __ Pb3(PO4)4+ __ Cr2S3  __ PbS2+ __ CrPO4
d. __ C12H20 + __ O2  __ CO2 + __ H2O
11. How many atoms are there in 3.21 moles of oxygen?( 1.93x1024atoms O)
12. How many moles is 5.67x1024molecules of Fe2O3?(9.4moles Fe2O3)
13. The questions below relate to the following equation. First balance the equation.
__ C5H8 + __ O2  __ CO2 +__ H2O
a) What is the ratio of C5H8 to H2O in this reaction?
b) If 4 moles of C5H8 react, how many moles of H2O must be produced?(16)
c) If 1 mole of C5H8 reacts, how many moles of CO2 will be produced?(5)
d) How many moles of CO2 will form if 4.3moles of O2 react?(3.1moles CO2)
14. What is the ground state of an atom? How does an atom become excited? How does it lose that
energy?
15. One of the definitions for the mole is that it is the number of atoms in 12 grams of carbon-12. How many
atoms are there in one mole of carbon-12?
16. In which directions on the periodic table do each of the following increase in value?
a) Atomic Radius
b) Electronegativity
c) Ionization Energy