# IPS Study Guide 101

### Mid-Term

### Mid-term

### Wednesday, Dec. 18th, 12am to Thursday, Dec. 19th, 12am

### Mr. Leeds Classroom

This test will be a part 1 and part 2 test that will last Wednesday and Thursday.

## Exam Format

Day 1: Calculations, Measurements, and Graphs

Day 2: Multiple Choice, True/False, and Mathcing

This test will not be scantron, but make sure you have pencils.

Will cover everything from lab safety up until experiment 3.8

Day 2: Multiple Choice, True/False, and Mathcing

- Lab Questions (Experimental Errors, etc.)
- Matching Terms

This test will not be scantron, but make sure you have pencils.

Will cover everything from lab safety up until experiment 3.8

## Lab Safety

- Tie up you hair for the burner and pull sleeves back
- Never walk away from burner; cap at the end and make sure the flame goes out
- Flush your skin with water for 1 min. and tell Mr. Leeds if a chemical touches you
- Always waft liquids, but never solids or powders
- Never taste or touch chemicals
- Always wear safety apron, goggles, and gloves if needed, never wear goggles in the forehead position
- Never use force to insert or remove glass
- Nurse ext: 2828
- fire extinguisher, fire blanket, eye wash/shower
- Never use chipped or broken glass; put in glass trash can
- Report
**all**accidents to Mr. Leeds__right away__ - Clean up after every lab, and wash hands (counts toward your grade)

## BD's BQ's

These questions were not exactly the hardest thing in this class. However, I do think looking over them one last time would be a very wise decision. You most likely would like to focus more on the Box Questions, because they focus on the overall chapter, where as the blue-dots tend to pertain just to the lab.

## Chapter 1 Quiz

**2. Why is the tea used in the experiment?**

A: Tea is the indicator that tells us whether the test tubes contain the same ingredients or not. In the experiment, when we added the tea, the heated test tube had a much darker color than the un-heated test tube. This proved the the two test tubes were not the same.

- For experimental errors, after stating the error, remember to say how it will impact the lab.

- When finding the volume of something, remember to read from the bottom of the miniscus, and to write cm^3

## Chapter 1 Test

3. When finding volume of sand without air space, subtract volume of water from the volume of sand and water to find the volume of the sand alone. Then to find the air space, subtarct the volume of the sand alone from the dry sand. Then to get the percentage of the dry sand that is sand, divide the volume of the sand by the volume of the dry sand and then round to the nearest whole number. To get the percentage of the dry sand that is air space, divide the volume of the air space by the volume of the dry sand.

4. 2.2 pounds per kilogram

5. To find the sensitivity, divide the range by the number of yes's and then round to the nearest tenths

6. range determines if someone made an error

4. 2.2 pounds per kilogram

5. To find the sensitivity, divide the range by the number of yes's and then round to the nearest tenths

6. range determines if someone made an error

**READ AND ANSWER ALL QUESTIONS**

REMEMBER UNITS, READ DIRECTIONS AND ROUNDING!!!!!!!!!

REMEMBER UNITS, READ DIRECTIONS AND ROUNDING!!!!!!!!!

## Chapter 2 Quiz

**Errors**

**1b) How would the mass of dissolved salt recovered compare with the mass of the salt you began with**

A: The mass would remain the same

**4b) Clearly explain**

**where****the condensation cam from and**

A: The condensation comes from the temperature outside the bottle touching the cold part of the bottle, where the area around the bottle instantly starts to cool and forms droplets as it touches the outside of the bottle.

__how__it forms on the bottle?- Remember your Units!!!!
- For histogram, if something lands on the line, then it falls to the right

## Chapter 2 Test

2. Mass of Copper and Sulfur experimental error, hole in the rubber sheet, will cause gas to leak causing a drastic change in the MF.

## Chapter 3 Quiz

**6. Explain how the experimental error as described in #4 would affect the calculated density of a rock?**

A: If a lab group found their rock's volume first, the water droplets left behind would add extra mass to the rock, therefore causing the density to increase.

- Remember to look for directions on rounding (tenths, hundreths...)
- For graphs, if the y-axis is something per something, then the line is constant. Also for density, remember your units (g and g/cm^3), and that the same rule as above applies.

## Chapter 3 Test

- If Mass increases, Density increases
- If Mass decreases, Density increases
- If Volume increases, Density decreases
- If Volume decreases, Density increases
- If Volume and Mass are the same, Density is one
- Objects that are made of the same substance that have the same voluem, will have the same mass
- The mass will double if the volume doubles
- Objects that have the same volume, but are made of different substances will NOT have the same mass

- Look and see if your answer has to be in scientific notation

- Magnesium sulfate what is used in epsom salt for sprained ankles
- When finding the Density of a Gas, the ∆M is the mass of the gas, and the ∆V is the volume of the gas

## Volume Notes

- Unit of measurement: cubic centimeters
- Volume: length x width x height (a x b x c)
- standard unit of length= meters
- 1 centimeter- 0.01 m.
- 1 mL= 1 cm cubed

**Balance**

- check that pan is clean and dry
- always "zero" balance before each massing

- push all riders to zero (left)
- Use adjustment knob

- Never switch pans
- pick up balance by red bar only
- don't zero balance when done

**Ruler**

- if ruler doesn't mark the tenths, you can only round to the tenths at the most
- if the ruler marks the tenths, you can only round to the hundreths at the most
- check to see where zero starts

**Graduated Cylinder**

- check the intervals
- be precise
**measure from the bottom of the miniscus**