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Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

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Page 1: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

Steel Wool Lab

Day 2Gathering Data & Making Sense Out of It

Page 2: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What normally happens when steel (iron) gets wet in the presence of air?

1. The iron dissolves into the water2. The water gets absorbed by the iron3. The iron will slowly rust4. Absolutely nothing will happen because they

do not chemically react with each other

Page 3: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What normally happens when steel (iron) gets wet in the presence of air?

1. The iron dissolves into the water2. The water gets absorbed by the iron3. The iron will slowly rust4. Absolutely nothing will happen because they

do not chemically react with each other

Page 4: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

If a gas is removed in this reaction, what should happen to the water level in the test tube?

1. It will go up2. It will go down3. It will not change

Page 5: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

If a gas is removed in this reaction, what should happen to the water level in the test tube?

1. It will go up2. It will go down3. It will not change

Page 6: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

Which gas do you think is removed in this process?

1. Hydrogen2. Nitrogen3. Argon4. Oxygen

Page 7: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

Which gas do you think is removed in this process?

1. Hydrogen2. Nitrogen3. Argon4. Oxygen

Page 8: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

The chemistry…

Fe (Iron) + O2 (Oxygen) Iron Oxide (Rust)

+ Fe2O3

Page 9: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What is the state of matter for each of the parts of this chemical equation?

Fe (Iron) + O2 (Oxygen) Iron Oxide (Rust)

1. Iron is a solid, Oxygen & Iron Oxide are gases2. Iron and Iron Oxide are solids, Oxygen is a gas3. All 3 are gases4. All 3 are solids

Page 10: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What is the state of matter for each of the parts of this chemical equation?

Fe (Iron) + O2 (Oxygen) Iron Oxide (Rust)

1. Iron is a solid, Oxygen & Iron Oxide are gases2. Iron and Iron Oxide are solids, Oxygen is a gas3. All 3 are gases4. All 3 are solids

Page 11: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What is an important characteristic of solids vs. gases?

1. Solids can’t become gases but gases can become solids.

2. Gases can’t become solids, but solids can become gases.

3. Gases typically occupy much more space than solids

4. Solids typically occupy much more space than gases

Page 12: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What is an important characteristic of solids vs. gases?

1. Solids can’t become gases but gases can become solids.

2. Gases can’t become solids, but solids can become gases.

3. Gases typically occupy much more space than solids

4. Solids typically occupy much more space than gases

Page 13: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What ought to happen in our Lab:

• When the oxygen in the test tube recombines with the iron to make rust, it will occupy a much smaller space.

• Water will move into the test tube to occupy that space—so the volume of the water in the test tube represents the volume of the air in the test tube that used to be occupied by oxygen.

Page 14: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

So, what would it mean if we found that half of the test tube was filled with water when we

checked our results?1. There is no oxygen in air2. 20% of air is oxygen3. 50% of air is oxygen4. 80% of air is oxygen5. 100% of air is oxygen

Page 15: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

So, what would it mean if we found that half of the test tube was filled with water when we

checked our results?1. There is no oxygen in air2. 20% of air is oxygen3. 50% of air is oxygen4. 80% of air is oxygen5. 100% of air is oxygen

Page 16: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What would it mean if we found that the water rose 8 cm high and

the test tube was 10 cm tall?

1. There is no oxygen in air2. 20% of air is oxygen3. 50% of air is oxygen4. 80% of air is oxygen5. 100% of air is oxygen

Page 17: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What would it mean if we found that the water rose 8 cm high and

the test tube was 10 cm tall?

1. There is no oxygen in air2. 20% of air is oxygen3. 50% of air is oxygen4. 80% of air is oxygen5. 100% of air is oxygen

Page 18: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

Let’s begin building our procedure for data collection:

1) Measure the height of the water in the test tube.

WHY? The water represents…--the amount of oxygen that was removed from the air in the test tube.

Page 19: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

What next?• We could measure the height of the entire

test tube and then divide the water height by the entire test tube height—but that introduces a couple of errors. WHAT ARE THEY?

--steel wool takes up some space--top of test tube is curved

Page 20: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

We can get around those problems using something like this:

• EXPLAIN what we can do

Page 21: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

Continue on your procedure:2) Measure out 50 ml of water in a 50 ml

graduated cylinder.3) Slowly pour water from the cylinder into the

test tube with the steel wool still in it. Pour until the water level reaches X cm from the top, where X represents your measurement from step 1.

4) Subtract the water volume remaining in the gradated cylinder from 50 ml. WHAT DOES THIS NUMBER REPRESENT?

(Volume of gas in test tube at the end of the lab)

Page 22: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

Finishing the Procedure:5) Continue slowly pouring water into the test

tube until it is filled to the top.6) Subtract the water volume remaining in the

gradated cylinder from 50 ml. WHAT DOES THIS NUMBER REPRESENT?

(Volume of gas in test tube at the start of the lab)7) Use subtraction to figure out the volume of

the water that was in the test tube at the end of the lab.

Page 23: Steel Wool Lab Day 2 Gathering Data & Making Sense Out of It

Your Assignment:

• Carry out your procedure & record all measurements. (DO NOT LEAVE TODAY WITHOUT THE MEASUREMENTS)

• Complete the calculation of percent oxygen AND the remaining questions on the handout.