IPS Exam Tests
Tests
Test #1
Part A: Calculations
If the height of the space was half the length of an edge of a unit cube, what was the volume of the box?
225 cm^3
If the height of the space was 0.47 of the length of an edge of a unit cube, what was the volume of the box?
224.1 cm^3
2. What is the mass of an iron bar that is 2cm x 4cm x 11cm (1cm^3 of iron has a mass of 7.8g)
686.4g
3. A volume of 87 cm^3 of dry sand is added to 46 cm^3 of water for a total volume of 104 cm^3.
29 cm^3
b. What is the volume of the water that does not fill the air spaces in the dry sand?
17 cm^3
4. To stay physically fit, Mr. Leeds is constantly training (and injuring himself). He weighs a trim 178 lbs. What is his weight in kilograms? (round to the whole number)
81 kilograms
5. Use the following data to find the sensitivity go the balance used: (round to the hundredths)
6. Five IPS scholars use the same single-pan balance to mass their friend's ring. None knew the results of the others. Their results are listed in the table below:
Yes, student number 3 made a mistake because when you subtract the greets massing minus the smallest massing you are supposed to get the sensitivity of the balance or less, around 0.02. I got 0.045, which is larger than the sensitivity of the balance. to check I changed the larger mass and the smaller mass to make sure student #3 made the mistake.
Part B: Lab Experiments:
1. During the Heating Baking Soda Experiment a lab group does not realize that they have a hole in their rubber tubing. how will this affect their understanding of the lab?
If there is a hole in the rubber tubing, then the lab group will not see that the baking soda is releasing a gas, pushing the water out of the bottle. Instead of gas entering the bottle, the gas will escape through the hole in the tubing.
2. During the Reaction in a Bag Experiment a lab group does not realize that there is a hole in their zip lock bag. How will this affect their understanding of the lab?
The lab group will not see the different effects of the mixing the liquid with substance a and b. For example, they will not see the air being produced and the bag getting bigger because it will escape through the hole.
3.For the Measuring Volume by Displacement of Water Experiment Mr. Leeds assigned lab groups different amounts of dry sand to begin the lab. Why did he do this?
He wanted to prove that the amount of sand does not matter. The percentage of air space in sand will stay about the same if you use the same type of sand.
Part C: Measurement
1. Next to each ingredient identify which are measured by mass, volume, or other means.
3 cups flour - volume
1 tablespoon baking powder - volume
1 1 pound can of pumpkin - mass
1/2 teaspoon vanilla - volume
cinnamon to taste - other means
1/2 cups milk - volume
2. For the following objects tell whether you would use a volume measurement, mass measurement, or count to describe the capacity of the object.
auditorium - count
bridge - mass
saucepan - volume
water tank - volume
3. Measure the following lines. Be as accurate as possible.
A:____________ 2.10 cm
B:__________________________________ 5.92 cm
4. Use the diagrams below to answer the following:
How much liquid is in cylinder A?
4.0 cm^3
How much liquid is in cylinder B?
1.30 cm^3
Part D: Critical Thinking
In the sensitivity of balance lab you were instructed to add 10 groups of squares with a mass between .003g and .007g to an already massed stopper. Why did they choose this range of mass for your 10 groups of squares and not a smaller rands; for example: .001g and .003g? How would this have changed your lab?
We would not have been able to find out the sensitivity of the balance because choosing 0.003g and 0.007g allowed us to see what masses the balance would detect and the would be no ∆M's.
Bonus:
In which year were pennies not made out of copper? What was the copper replaced with?
In 1943 copper was replaced with steel.
Test #2
1. Describe a possible error (specific to the lab) discussed in class, which could lead to a loss in mass during the Mass of a gas lab. Be sure to explain why this error would cause a loss in mass.
Error: Cap is not on tight OR quick enough
Explanation: gas will escape
2. Describe a possible error (specific to the lab) discussed in class, which could lead to a loss in mass during the Mass of Copper and Sulfur lab. Be sure to explain why this error would cause a loss in mass.
Error: If there was a hole in the rubber sheet.
Explanation: This would be a possible error because it would allow gas to escape. Also, this would make it no longer a closed system. This would add mass and not be following the law of Conservation of Mass.
3. During an experiment of Ice and Water a gain in mass is noted by a lab group. Give a possible error (specific to the lab), discussed in class, as to how this gain in mass could have occurred. Be sure to explain why this error would cause a gain in mass.
Error: If they did not wipe off the condensation that formed around the bottle after the Mi during the Mi, when it starts to form.
Explanation: The condensation will add mass because the condensation comes from the warm water vapor in the air touching the cool bottle, not from what is in the bottle already, so it will add mass. the condensation was not there before the Mi, so you don;t want it to be there during the Mf.
Part 2: Analysis
1. During the ice and water lab a lab group forgot to put the cap on their bottle. by the time they realized their mistake some condensation had already formed on the outside and inside of the bottle. they should:
A) put the cap on, wipe off the condensation on the outside an continue
B) not worry because the condensation on the outside and continue
C) start the lab over
D) wipe off equal amounts of condensation inside and outside, put on cap and continue
2. In all four experiment from Chapter 2 the common theme involved investigating changes in mass of different states of matter. you now know that in all the labs there should be no change in mass because:
A) in all 4 labs everyone in class calculated no change in mass
B) all the labs followed Einstein's theory of relativity
C) Newton's Laws of motion
D) Law of conservation of mass
3. Yur are working in a class with no air conditioning, it is 90 (degree symbol) F. Your lab is to take the mass of water (that is 65 (degree symbol) F) in a small plastic bottle with a cap on, then place the bottle in a walk-in freezer allowing the liquid to solidify, then re-mass the bottle while in the freezer. What is a possible error you should be aware of:
A) condensation may form on the inside of the bottle during the Mi and then freeze
B) the water could tart boiling and push the cap off
C) condensation may form on the outside of the bottle during the Mi and then freeze
D) all of the above
4. A lab group dissolves 2g of salt into 8cm^3 of water in a beaker with no cover. After a few days all of the water has evaporated. what will remain in their beaker?
A) 2g of salt
B) 4cm^3 of water
1g of salt
D) none of the above
Part 3: Calculations
The following data were recorded in an experiment involving heating copper and sulfur
Test tube, rubber sheet, and rubber band 23.681g
Test tube, rubber sheet, rubber band, copper, and sulfur before reaction 25.524g
Test tube, rubber sheet, rubber band, and products after reaction 25.498g