Honors Chemistry Bell ringers semester 2 set 1

1. Honors Chemistry
Molar Calculation Practice
Assignment 1/26/12
Using elements and compounds from the naming quiz
1/25/12:
1. Determine the molar masses of each
1. How many apply the following: 6. How many moles in 3.3 grams of
2. Then moles in 5 grams of …
…
2. What is the mass of 5 moles of ... 7. What is the mass of 3.3 moles of
…
3. How many moles in 10 grams of … 8. What is the % composition of each
element in …
4. What is the mass of 10 moles of … 9. How many moles in 6.6 g of …
5. What is the % composition of each 10. What is the mass of 6.6 moles of

2. Honors Chemistry
Bell ringer 1/30/12
Considering what you know about the
structure of atoms explain why the charge
on an ion would not affect its molar mass.
Name three things that might happen in a
chemical reaction.

3. Honors Chemistry
Bell ringer 1/30/12
Electrons are about 2000 time smaller than
protons so losing one or more electrons will
not affect the molar mass of a substance.
Three things that might happen in a
chemical reaction: Color changes, gas
evolves, heat is created

4. Honors Chemistry
Bell ringer 1/31/12
For each of the following reactions identify
the missing Reactants or Products and
balance the Eq.

6. Honors Chemistry
Bell ringer 1/31/12
For each of the following reactions identify
the missing Reactants or Products and
balance the Eq.

7. Honors Chemistry
Bell ringer 2/1/12
Which of these reactions will occur and
which will not. If a reaction will occur what
is the balance Rxn.

8. Honors Chemistry
Bell ringer 2/2/12
What are the ratios of elements in:
CO2
C 2O 2
By mass?
By # of particles?

9. Honors Chemistry
Bell ringer 2/3/12
Read The Case for Combustion
on Page 278-279

10. Honors Chemistry
Bell ringer 2/8/12
1. In the lab we just finished was the
process a chemical or a physical
change?
2. Were there indications that the
change was chemical? Describe.
3. Were there indications that the
change was physical? Describe.

11. Honors Chemistry
Bell ringer 2/9/12
4.51 grams of water were evaporated from a
10.00 gram sample of Iron (II) sulfate
hydrate.
1. What is the percent composition of water
in the hydrate?
2. What is the mass of the anhydrous iron
(II) sulfate?
3. What is the empirical formula for the iron
(II) sulfate hydrate?

12. Honors Chemistry
Bell ringer 2/10/12
4.51 grams of water were removed from a
10.00 gram sample of Iron (II) sulfate
hydrate.
1. What is the percent composition of water
in the hydrate?
2. What is the chemical formula for the Iron
(II) sulfate?

13. Honors Chemistry
Bell ringer 2/13/12

14. Honors Chemistry
Bell ringer 2/14/12

15. Honors Chemistry Bellringer 2/16/12
 Write the Chemical formulas for
the following compounds
Magnesium sulfate
Copper (II) sulfate
Lead (II) nitrate
Silver nitrate
Zinc sulfate