Quiz #1

IPS

IPS Lab Safety

For Every Lab
  • Goggles must be kept OVER YOUR EYES until Mr. Leeds says to put them away- even if you are already finished and cleaned up
  • Report all accidents/spills to Mr. Leeds immediately
  • Try you best to use common sense
In Case of Emergency

Nurse- ext:2828

Safety Equipment in Classroom

  • Fire extinguisher
  • Fire blanket
  • Eyewash/shower

Chemicals

  • Never taste chemicals (even if they look yummy!)
  • Always waft liquids to detect odor
  • NEVER WAFT SOLIDS/POWDERS!

Glass

  • Hot glass and cold glass look the same
  • Never use chipped or broken glass- tell Mr. Leeds and dispose of broken glass in proper trash
  • Never use force to remove or insert glass

Alcohol Burners

  • Roll up sleeves, put UP long hair, Not just pull back (or you cannot do lab)
  • Never walk away from a lit burner
  • Never point the open end of a hot test tube at yourself or someone else
  • Don't look down into a test tube/beaker while it is being heated
  • Make sure burner is capped and flame is out when done

End of Experiment

  • CLEAN UP AREA AND MATERIALS COMPLETELY!!!! (Or you LOSE points!)
  • Make certain that burner is out if one was used
  • Keep goggles on (over eyes) until Mr. Leeds says to put them away.

Reaction in a Bag

The purpose of the Reaction in a Bag lab was to record the observations that occur when multiple chemical substances are combined. In this lab, we took two solids and a red liquid and mixed them together to cause a reaction. The mixture turned yellow and thick, the temperature started getting hotter, and the bag started expanding with gas.

Post-Lab:

Red Liquid

  • Phenol Red
  • used as a pH indicator
pH scale-
  • measures acidity
  • goes from 0-14
  • 0-6 is acid, 7 is neutral, 8-14 is alkaline
Solids

A-

  • calcium chloride (calcium + chloride)
  • acidic
  • low pH
  • hydotrophic- absorbs water, is attracted to water
Uses:
  • preserves canned vegetables
  • electrolyte in sports drinks
  • flavors pickles (salty)
B-
  • sodium bicarbonate (baking soda)
  • not acidic
Uses:
  • toothpaste
  • volcanoes
  • laundry detergent

Heating Baking Soda

The purpose of the Heating Baking lab was to record our observations of the reaction of baking soda when it is heated. In this lab, we connected a test tube of baking soda to tubing in a water-filled bottle. The bottle was in a water-filled container. When we started heating the test tube, the water seeped out of the bottle and into the container, while gas from the baking soda condensed at the top of the test tube. After we dissembled the setup, we filled the heated test tube with tea. After that, we took a different test tube, filled it with baking soda, and poured tea into both test tubes.

Box Questions

Box Questions (#1, 3-13)

Q#1:

When baking soda is heated, it releases a gas that tries to escape. This helps the dough to rise in items such as bread, cookies, cupcakes, muffins, or scones.


Q#3:

50 cubic centimeters.


Q#4:

Formula- length x width x height

Box A

5x2x3=30

Box B

7x2x1=14


Q#5:

The stone is 7 cubic centimeters.


Q#6:

a. 8 cubes

b. 27 cubes

c. a= 8 cubic centimeters b= 27 cubic centimeters


Q#7:

The 2nd rectangle has a larger volume.


Q#8:

As the height increases, the surface decreases.


Q#9:

a. I- 1.3 cm

II- 3.7 cm

No, because the scale is not small enough.

b. III- 1.65

IV- 2.52

V- 4.50

No, because the scale is not small enough.

c. Because if the line is in between two marks, you want to be more accurate and have a more precise measurement.


Q#10:

a. 0.1 cubic centimeters

b. 0.2 cubic centimeters

Q#11:

a. 4 cubic centimeters

b. 1.3 cubic centimeters


Q#12:

12 cm: 11.5-12.4

12.0 cm:11.95-12.04

12.00 cm: 11.995-12.004


Q#13:

You can read decimals better- lines further apart because there is less surfaces, so you need more depth, less height, thus easier to read.

Volume

Volume

Units of measurement: cubic centimeters)
Volume: l x w x h (length x width x height)
Standard units of length: meters (m)
One centimeter (i cm) = 0.01 m
100 cm = 1m
Unit cube- a small cube measuring 1cm on each end


Volume of Liquids

-use graduated cylinder to measure volume

-always check the intervals of scales

-units = milliliters

1 ml = 1 cubic centimeter

-read from the bottom of the meniscus

Using the Balances

1. Check that pan is clean and dry

2. Always "zero balance" before EACH MASSING

  • Push all riders to zero (left)
  • Use adjustment knob if needed
3. Never switch pans

4. Pick up balance by red bar only

5. Do not zero balance after you are done

Sarah Sukal