steel wool lab day 2 gathering data & making sense out of it
TRANSCRIPT
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Steel Wool Lab
Day 2Gathering Data & Making Sense Out of It
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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
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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
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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
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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
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Which gas do you think is removed in this process?
1. Hydrogen2. Nitrogen3. Argon4. Oxygen
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Which gas do you think is removed in this process?
1. Hydrogen2. Nitrogen3. Argon4. Oxygen
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The chemistry…
Fe (Iron) + O2 (Oxygen) Iron Oxide (Rust)
+ Fe2O3
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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
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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
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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
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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
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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.
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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
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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
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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
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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
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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.
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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
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We can get around those problems using something like this:
• EXPLAIN what we can do
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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)
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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.
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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.