Transcript Chemistry 100 - University of Illinois at Urbana–Champaign

Chemistry 202






Dr. Don DeCoste
367J Noyes Lab
[email protected]
11am-12pm Mondays and
Wednesdays (after lecture)
10-11 am Tuesdays and 1-2 pm
Thursdays
By appointment; open-door policy
1
Lon-Capa


1st HW assignment due Friday, 9/5, 5 pm. It
is open now.
1st Quiz due Sunday, 9/7 by 10 pm. It will
open Friday, 9/5 at 5 pm.
2
Using The Periodic Table
3
4
Table 2-5 p39
5
Table 2-6 p40
A Question for You…
You make a sculpture of carbon
with the same mass as an adult
human.
Determine the number of carbon
atoms in the sculpture.
6
A Question for You…
You make an ice sculpture of with
the same mass as an adult
human.
Determine the number of atoms in
the sculpture.
7
Average Atomic Mass?
8
Clicker Question
Balance the following equation in standard form
and determine the sum of the coefficients:
C2H5OH + O2 → CO2 + H2O
A)
B)
C)
D)
E)
4
5
8
9
10
9
Limiting Reactant Concept
Hydrogen (H2) and nitrogen (N2)
react to form ammonia (NH3).
10
Clicker Question
Which of the following reaction mixtures would
produce the greatest amount of product according to
the following chemical equation?
2H2 + O2  2H2O
a)
b)
c)
d)
e)
2 mol H2 and 2 mol O2
2 mol H2 and 3 mol O2
2 mol H2 and 1 mol O2
3 mol H2 and 1 mol O2
Each of the choices above would produce the
same amount of product.
11
Clicker Question
Which of the following reaction mixtures would
produce the greatest amount of product according to
the following chemical equation?
2H2 + O2  2H2O
a)
b)
c)
d)
2
2
2
3
mol
mol
mol
mol
H2
H2
H2
H2
and
and
and
and
2
3
1
1
mol
mol
mol
mol
O2
O2
O2
O2
12
A Question for You…
500.0 g of hydrogen gas and 500.0 g of
oxygen gas are reacted to form water.
Determine the mass of water produced
(563.0g) and the mass of excess reactant left
over (437.0g H2).
Prove mass has been conserved.
(500.0 g + 500.0 g = 563.0 g + 437.0 g)
13