IPS Quiz #1

Study Guide for IPS Test

Safety:

  • 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
  • Nurse extension: 2828


Safety Equipment:

  • Fire extinguisher
  • Fire blanket
  • Eye wash/shower


Safety with Chemicals:

  • Never taste chemicals
  • Always waft chemicals to detect odor
  • Never waft solids/powders
  • Avoid touching chemicals
  • Always wash hands with soap and water after lab
  • If chemicals touch skin: flush skin with water for 1 minute and notify Mr. Leeds


Safety with Glass:

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


Alcohol Burners:

  • Roll up sleeves and put up long hair (do not just pull back)
  • Never walk away from a lit burner
  • Never point the open end of a hot test tube at yourself or someone else
  • Do not 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 & materials completely (or 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


Lab: Reaction in a Bag

Science Behind Lab:


  • When A + B + liquid, bag has gas.
  • A + liquid makes hot. (Exothermic Reaction--giving off heat)
  • B + liquid makes cold. (Endothermic Reaction--consumes heat)


Substances Used in Lab:

Lab: Heating Baking Soda

Post Lab:
  • Gas comes from heating baking soda
  • Condensation comes from hot gas touching cooler top of test tube, turns it back to a liquid.
  • Color difference: must be different because heated test tube is different color than unheated (know that is baking soda).



Control group: unheated test tube


Experimental group: heated test tube


Indicator: tea (shows that heated test tube is not baking soda)


Variable: something you try to measure


Independent variable: causes a change in dependent variable--temperature (heat)


Dependent variable: color of tea


Control factors:

same type of tea

same amount of tea

same amount of baking soda

same temperature

same stirring time

same size test tubes

Volume

Unit of measurement: cm3^


Volume=lwh


Standard Unit of Length: meter (m)


1 centimeter (1 cm) = 0.1 m

Centi = 100

100 cm = 1 m


Unit Cube: a small cube--1 cm on each edge

1 cubic centimeter (1 cm3^)


Volume of Liquids:

-use a graduated cylinder to measure volume

*Always check the intervals or scale


units = milliliters (mL) or cm3^

1 mL = 1 cm3^


-read from bottom of meniscus

Single Pan Balance

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. Don't zero balance when done.

Box Questions #1-13 (no #2)

1. Why do you think baking soda is used in baking?

When heated, it releases a gas and that causes the dough/batter to rise.


3. How many cm of water are needed to fill a graduated cylinder to 50.0 mL mark?

50 cm


4. Rectangular box A has a greater volume than rectangular box B but the length of box A is less than the length of box B. How is this possible?

Because the width and height of box A is bigger than box B's.


5. Adding a stone to a graduated cylinder containing 25.0 cm of water raises the water level in the cylinder to the 32.0 cm mark. What is the volume of the stone?

7 cm


6. A student has a large number of cubes that measure 1 cm along each edge.

a) How many cubes will need to build a cube that measures 2 cm along each edge?

8 cm

b) How man cubes will need to build a cube that measures 3 cm along each edge?

27 cm

c) What is the volume, in cubic centimeters of each of the cubes in (a) and (b)?

8 cm, 27 cm


7. One rectangular box is 30 cm long, 15 cm wide, and 10 cm. deep. A second rectangular box is 25 cm long, 16 cm wide, and 15 cm. Which box has larger volume?

Second box.


8. Figure A shows a cone-shaped graduate used for measuring the volume of liquids. Why are the divisions not equally spaced?

Because the more surface, the less depth or height there is (*vice versa)


9.

a) Can you estimate positions of I and II to 0.01 cm?

I. 1. 2

II. 3.8

b) Can you estimate positions of III, IV, and V to 0.001?

III. 1.65

IV. 2.55

V. 4.50

c) Why should you report the positions of the arrows in part (b) to the nearest 0.01 cm and not to the nearest 0.1 cm?

Because it would be a guess.


10. Which part of a cubic centimeter do the smallest divisions on each of the graduated cylinders in Figure C represent?

a. .1 cm

b. .2 cm


11. What is the level of the liquid figure D(a) to the nearest half division? What is the level in Figure D(b) to the nearest half division?

D(a). 4 cm

D(b). 1.3 cm


12. Three students reported the length of a pencil to be 12 cm, 12.0 cm, 12.00 cm. Do all three readings contain the same information?

12: 11.5--12.4

12.0: 11.95--12.04

12.00: 11.995--12.004


13. What advantage is there to making graduated cylinders narrow and tall rather than short and wide?

Lines are going to be farther apart because less surface means more depth; it is easier to read.

Science is fun!