1. write a balanced chemical equation for the reaction between solid zinc and solid sulfur. 2. what...
TRANSCRIPT
1. Write a balanced chemical equation for the reaction between solid zinc and solid sulfur.
2. What is the reaction type?
Day 4 9-26
You do NOT have to write this one:
Sit with your lab group from Friday and get out your lab handout!
Day 5 9-29
Lab Reports are due Wednesday 10-1
Monday 9-29 for bonus
You do NOT have to write this one:
Sit with your lab group from Friday and get out your lab handout!
Day 6 9-30
Lab Reports are due Wednesday 10-1
Monday 9-29 for bonus
CORRECT AMOUNT = 3.21 grams
1/10 the molar mass of Zn reacts with 1/10 of the molar mass of S
So why is it 1/10 for 1/10? Why not 1/10 for 2/10 or 3/10?
And where’d the masses come from?
The key came from a combination of the atomic masses and the chemical equation:
Zn + S ZnS
For every one “piece” of Zn we need one “piece” of S to form one “piece of ZnS
1/10 for 1/10
So where’d the masses come from?
So what was the key?
A mole is like a dozen, BUT better, How?
A mole is a counter like a dozen, but it also relates to mass!!!
Avogadro’s #
6.022 * 1023 = 1 mole
The atomic mass
= 1 moleCa20
Calcium
40.08
Avogadro’s #
6.022 * 1023 = 1 mole
Conversion Factors:
6.022 * 1023 particles
1 mol
1 mol
6.022 * 1023 particles
Molar Mass – the mass of one mole of the substance is its molar mass (g/mol) = atomic mass of the element
- The molar mass of an element contains 1 mole of atoms (6.022 * 1023 atoms)
So …
We can convert from grams to moles to atoms and back and forth and everything in between
We have a new kind of conversion: If you know grams of some
to moles using the molar mass on the periodic table:
substance you can convert
820 g of Iron (Fe) = __________ mols?
820 g of Iron (Fe) = __________ mols?
820 g Fe X55.847 g Fe
1 mol Fe=
1.5 * 101 m
ols Fe
820 g of oxygen (O) = _________ mols?
820 g O X15.999 g O
1 mol O=
5.1 * 101 m
ols O
If mols count atoms, What can we tell about the atoms of Fe compared to the atoms of O???
= Masses
- More Oxygen atoms
Therefore Iron atoms Must be bigger
6.54 g of Zinc = __________ mols?
6.54 g Zn X65.4 g Zn
1 mol Zn =
1.00 * 10-1 mols Zn
Read + review section 10.1 (pages 306-315) AND complete #s 9-15 due on Thursday 10-2