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 your best to use common sense
In Case of Emergency:
Nurse: ext. 2828
Safety Equipment in Classroom:
Never taste chemicals (even if they look yummy!)
Always WAFT liquids to detect odor
NEVER WAFT SOLID/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
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
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 end of a hot test tuber at yourself or someone else
Do not look down into a hot 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 you lose points)
Make certain that burner is out if one was used
Keep goggles on (over eyes) until Mr.Leeds say to put them away
Post Lab: Reaction in a Bag
-used as Ph indicator
-Goes from 0-14
-Lemon juice is 1.5
-Tums is 10
-Below 7 turns yellow
-Above 8 turns pink
-Calcium Chloride (Calcium+Chloride)
-Hydrophobic: attracted to water (absorbs water)
Canned Vegetables (keeps them from getting mushy), electrolyte in sports drinks, flavors pickles (salty flavor)
-Sodium Bicarbonate (Baking Soda)
Baking, Toothpaste, Laundry Detergent, Cat Liter
Post Lab: Heating Baking Soda (Lab 1.1)
1. Nothing happened at the bottom of the test tube.
2. There was condensation at the top of the test tube.
3. The water in the inverted bottle drains into the container and the bottle fills with gas.
4. The gas came from the heated baking soda.
5. The condensation on the test tube came from the gas.
6. In the heated test tube it was darker than the cool one.
7. The two substances are not the same. The heated test tube was a different color than the unheated test tube.
Control Group: Heated test tube
Experimental Group: Unheated test tube
Indicator: Tea (shows heated test tube is not baking soda)
Variable: Something you try to measure
Independent Variable: Causes a change in the dependent variable- temperature(heat)
Dependent Variable: Color of the 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
Experimental Errors: Hole in the rubber tubing- won't see the bottle fill with gas; stopper not snug on test tube- won't see the bottle fill with gas; stirring rod was not clean at the beginning of the lab- contaminate test tubes
Extra Question: There was less condensation than baking soda because the condensation comes from the baking soda and it can't produce more than itself.
Standard unit of length= meter (m)
1 centimeter (1cm)=0.01m (meters
100 centimeters (100cm)=1m (meter)
-a small cube l cm on each side
Volume of Liquids:
-Use a graduated cylinder to measure volume
*always check the intervals or scale
-Units= Milliliters or cm3 (1mL=1cm3
-Read from bottom od meniscus
Single Pan Balance Notes
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 (Omit #2) pgs. 5,8,10, and 11
4. There can be a shorter length as long as the width and height and height are bigger.
6c. 8cm3 27cm3
7. Box 1: 4,500cm3 Box 2: 6,000cm3
8. The less the surface you have the more depth you need and vice-versa.
9a. Arrow I: 1.2 Arrow II: 3.8
9b. Arrow III: 1.65 Arrow IV: 2.52 Arrow V: 4.50
9c. To be more accurate
13. Easier to read because the lines are further apart.
Post Lab: Measuring Volume by Displacement of Water (Lab 1.4)
1. Sand sticks to the sides of the wet cylinder
2. Pour water into sand (water will sit on top of sand)
Why were lab groups instructed to use different amounts of dry sand?
It shows it doesn't matter how much dry sand you have, the amount of air space was approximately 40%.