IPS Exam

Lab Safety notes

Every Lab
  • Goggles over eyes until Mr. Leeds says so
  • Report all accidents and spills to mr. leeds immediately
  • Use common sense

Emergency

  • Dial 2828 for nurse

Safety equipment

  • Fire extinguisher
  • Fire blanket
  • Eye wash/ shower

Chemicals

  • Never taste chemicals
  • always waft liquids, never solids or powders
  • avoid touching chemicals
  • always wash hands with soap and water after lab
  • Flush out sind for a minute and notify mr. Leeds of a chemical touches your skin

Glass

  • Both hot and cold glass look the same
  • Don't use chipped or broken glass, tell Mr. ledds and dispose of the broken glass in the proper trash
  • Never use force to remove or insert glass

Alcohol Burners

  • Roll up sleeves, and put up long hair, not just pull back
  • Dont' ever walk away from a lit burner
  • Do not point the open end of a hot test tube at yourself or someone else
  • do not look down into the test tube or breaker while being heated
  • Make sure you cap burner and flame when done

End of experiment

  • Clean up area and materials completely
  • Make sure the burner is out if one was used
  • keep goggles over your eyes until Mr. Leeds tells you to put them away



Volume Notes

Unit of measurement: CM3 (cubic centimeters)


Volume= LxWxH (AxBxC)

Standard unit of length= M (meter)

1/100= 0.1 cm

100 CM= 1M

Unit Cube

- a small cube 1 cm on each edge

volume of liquids

-Use a graduated cylinder to measure volume *always check intervals on scale

Units= Milliliters (mL)or cm3

1mL=1cm3

-Read from bottom of meniscus



Heated Baking Soda Lab

Purpose


  • To observe and record the reaction that occurs when baking soda is heated

Experimental Errors


1. If an air bubble appears in the bottle the experiment wouldn't be successful because too much water would have left the bottle

2. if there was a tiny hole in any part of the rubber tubing that would allow a release of all the gasses

Conclusion:

The purpose of this lab was to record the reaction that occurs when baking soda is heated. Once the lab was set up correctly and the burner was lit I observed that the Baking soda turned a darker color, which was really the only significant difference. When I observed the top of the test tube I notice that water started to condensate around inside the tube and little drops of water enter the glass bend. I then noticed water started to leave the bottle and enter the container. From my observations I conclude that the gas from the test tube entered the bottle and in the process made a large air bubble pushing out all of the water and filling the bottle with gas. Extra Questions:



There was more condensation than baking soda because there was only baking soda at the bottom of the test tube, the condensation only started at the top of the test tube and increased into the glass bend and into the rubber tubing, which led to the bottle.



Reaction in a Bag

Box Questions

1. Baking sods releases gas when heated helping the dough/batter rise (cupcakes, cookies, bread, muffins etc.)


3. 50 cm3 or 50 mL

4.Rectangle A has greater height or width

5. 7 cm3

6.

A. 8 cm along each edge

B. 27 cm along each edge

c. 8 cm3, 27 cm3

7. The second box has more volume

8. As the height increases the surface decreases

9.

A. I1.2 II3.7 no, because you can only estimate one more measurement than is shown B. III1.65 IV2.51 V4.50 because you can only estimate one more measurement than is shown. C. Your measurement is more accurate

10. a) 0.1 B) 0.2

11. a) 4 cm3 b) 1.3 cm3

12. 12. cm- 11.5-12.4 12.0 cm- 11.95- 12.04 12.00- 11.995-12.004

13) Lines are further apart because there is less surface so you need more depth in between them.



Volume notes 1.2

Unit of measurement: cm3

volume= LxWxH (AxBxC)

Standard unit of length= meter (m)

1 ml= 1 cm3

lab 1.4

Exp. errors:


1. sand sticks to the side of the cylinder

2. pour water into sand

Extra Questions:

It didn't matter how much dry sand you began with each group had about 40% air space

1.6 mass

Beqa- ancient standard mass used in egypt.


Earliest balance in egypt

mass unit grams (g)

1 kilo (kg)= 1,000 g

1 kg= 2.2 pounds

lab 1.8

penny notes


1982: 95% copper, 5% zinc

After 2.5% copper 97.5% zinc (computer technology)

1943- made of steel and zinc

- copper was needed for shell casings (bullets)

Sensitivity: the lightest mass you can expect to detect +- the margin of error when you mass something

lab 2.1 dissolved salt

exp. errors:


1. clean pan between mass initial and mass final

2. outside of bottle is wet during mi, and you don't wipe it off

Histograms:

- If data falls on the line graph it in the column to the right

- find largest and smallest measurements first


lab 2.4 (post lab)

Condensation on bottle comes from water vapor in the air (humidity) when it touches a cool surface of bottle it turns from a gas to a liquid

Errors:

1. Not wiping off condensation- gain in mass

2. shake bottle; lose mass

lab 2.5

Yellow smoke- water inn sulfur turns to vapor and rises in test tube. When it cools sulfur bonds with copper, forms copper sulphide

Exp. Errors

- hole in rubber sheet- gas escapes

- sheet not tight enough gas also escapes

Lab 2.6

Closed system- a space where nothing can leave or enter


Law of conservation of mass- in a closed system mass will remain constant regardless of the actions of the processes in the closed systems

20 degrees celsius- room temp.

chapter 3

Property of an object- does not tell you what it is made of

property of a substance- helps you identify what the object is made of


3.2 mass and volume

Objects that are made of the same substance and have the same volume will also have the same mass (regardless of shape) Ex. long aluminum cylinder, short aluminum cylinder.


The mass of an object doubles if it's volume doubles

Objects that have the same volume but are amde of different subtsances will not have the same mass. Ex. aluminum and brass cylinders.

When calculating density: mass over volume

Aluminum- 2.7 grams

brass- 8.5 grams

Lab 3.5

Different density's for the rocks because they are different substances


exp. errors-

1. paint chips, loss of mass

2. mass cube 2x by accident

3.6 density of a liquid

Epson salt- magnesium sulfate


exp. errors

1. put foil back for M.i.

2. touching tablet after M.i.

Test #1

Big image

Test #3 Errors

1. In order to calculate density, you find both the mass and volume of the liquid in the graduated cylinder because, this is the most accurate way and did not include transferring liquids.


2. When finding density of a liquid most accurate method of measurement- none of the above

3. During density of a gas lab the rubber tubing is incorrectly inserted near the mouth of the bottle, this will cause less gas to collect in the bottle

4. if the error in #3 is made then volume decreases and density increases

5. when calculating density of a rock and experimental error would be finding the volume prior to the massing

6. when the Alka seltzer tablet is mixed with sodium bicarbonate it releases carbon dioxide

7. In density of a gas lab a student forgets to include foil for MF the result is, mass of gas increases volume decreases.