Steel Wool Lab Day 3
PRS Check of your understanding
When we put the steel wool in vinegar,
water, and then exposed it to the air in
the test tube, what happened to it?
1.
2.
3.
4.
Nothing
It had a chemical reaction which produced water
It had a chemical reaction which produced rust
It had a chemical reaction which produced
oxygen
When we put the steel wool in vinegar
salt water, and then exposed it to the air
in the test tube, what happened to it?
1.
2.
3.
4.
Nothing
It had a chemical reaction which produced water
It had a chemical reaction which produced rust
It had a chemical reaction which produced
oxygen
When the steel wool rusted, what
happened to the test tube?
1.
2.
3.
4.
The glass broke
Water went into the test tube
Gas went into the test tube
The test tube expanded
When the steel wool rusted, what
happened to the test tube?
1.
2.
3.
4.
The glass broke
Water went into the test tube
Gas went into the test tube
The test tube expanded
Why did the water go into the test
tube?
1. Oxygen gas became a solid and solids take up
less space than gases.
2. Carbon Dioxide gas became a solid and solids
take up less space than gases.
3. Oxygen gas became a solid and solids take up
more space than gases.
4. Carbon Dioxide gas became a solid and solids
take up more space than gases.
Why did the water go into the test
tube?
1. Oxygen gas became a solid and solids take up
less space than gases.
2. Carbon Dioxide gas became a solid and solids
take up less space than gases.
3. Oxygen gas became a solid and solids take up
more space than gases.
4. Carbon Dioxide gas became a solid and solids
take up more space than gases.
Based upon the following information,
what was the volume of gas in the test
tube at the start of the experiment?
Gas Volume at end of the
experiment = 36 ml
Volume of water in the
test tube at end of the
experiment = 7 ml
Click in your answer.
Note: at the start of the
lab there was no water
in the test tube
Based upon the following information,
what was the volume of gas in the test
tube at the start of the experiment?
Gas Volume at end of the
experiment = 36 ml
Volume of water in the
test tube at end of the
experiment = 7 ml
Note: at the start of the
lab there was no water
in the test tube
Answer = 43 ml
Based upon the following information,
what was the volume of oxygen in the test
tube at the start of the experiment?
Gas Volume at end of the
experiment = 36 ml
Volume of water in the
test tube at end of the
experiment = 7 ml
Click in your answer.
Note: at the start of the
lab there was no water
in the test tube
Based upon the following information,
what was the volume of oxygen in the test
tube at the start of the experiment?
Gas Volume in the test
tube at end of the
experiment = 36 ml
Volume of water in the
test tube at end of the
experiment = 7 ml
Note: at the start of the
lab there was no water
in the test tube
Answer = 7ml
Based upon the following information,
what is the calculated percentage of
Oxygen in the air?
Gas Volume at end of the
experiment = 36 ml
Volume of water in the
test tube at end of the
experiment = 7 ml
Click in your answer.
Note: at the start of the
lab there was no water
in the test tube
Based upon the following information,
what is the calculated percentage of
Oxygen in the air?
Gas Volume at end of the
experiment = 36 ml
Volume of water in the
test tube at end of the
experiment = 7 ml
Note: at the start of the
lab there was no water
in the test tube
7 ml / 43 ml *100 = 16.2%  rounds to 16%
What is the actual percentage of
oxygen in air according to scientists?
• Click in your answer
What is the actual percentage of
oxygen in air according to scientists?
About 21 %
What would your percent error be
if your lab value of % oxygen was
26% while experts say it should be
21%?
Click in your answer in percent rounded to the
nearest whole number.
What would your percent error be
if your lab value of % oxygen was
26% while experts say it should be
21%?
(26-21)
21
X 100 = 5/21 X 100 = 23.8 rounds to 24