Questions
A. From your
balanced equation what is the theoretical yield of your product?
I got
B.
According to your data table, what is the
actual yield of the product?
64.6g
64.6g
Sunday, September 15, 2013
Stoichimetry f a Precipitation Reaction
Questions
A. From your
balanced equation what is the theoretical yield of your product?
C. A perfect
percent yield would be 100%. Based on your results, comment on your degree of
accuracy and suggest possible sources of error.
Possible sources of error could be occurring in the weigh boat.
D. How could
these errors be reduced in the future?
Use the water to make the weigh boat clean and thereby getting all into the mixture.
Sunday, September 8, 2013
Substance: Mg
Color: red-brown
Odor: metallic
Effect of Heat: crunched
Litmus test: solid
Substance: Cu
Color: reddish
brown
Odor: metallic
Effect of Heat: holes
developed
Litmus test: purple
Substance: Zn
Color: silvery
Odor: metallic
Effect of Heat: develops
holes and steams
Litmus test: purple
Substance: NaCl
Color: opaque white
Odor: salty
QUESTIONS:
A - Did you observer any
chemical changes in this experiment?
yes
B - What evidence
did you use to decide that something was a chemical change?
element and reactions
element and reactions
C -
Give at least two examples of chemical changes you observed.
steaming, formations
D -
Classify the following properties of sodium metal as physical or chemical:
Silver metallic color – physical
Turns gray in air – chemical
Melts at 98oC - physical
Reacts explosively with chlorine - chemical
E - Classify the following changes as physical or chemical:
Water freezes at OoC
- physical
Baking soda when
combined with vinegar produces bubbles:- chemical
Mothballs gradually
disappear at room temperature – physical
Ice cubes in a freezer
get smaller with time – physical
Baking soda loses mass
as it is heated – chemical
Tarnishing of silver – physical
F - How would you show that dissolving table salt is a physical change?
Dehydrate the solution
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