By: Hannah Schaffer
Lab Safety Part A:
1. Test the odors of liquids by ____________ them under your nose.
2. If something spills or breaks the first thing you do is _______________.
tell Mr. Leeds
3. You should wash your hands with __________ and ___________ after handling all chemicals.
4. Never use _____________ to remove or insert glass.
5. Before leaving class, your lab area must be completely ________________.
6. Capping the alcohol burner putst out the fame because fire needs ________________.
7. You must keep your ______________ on until Mr. Leeds says to remove them.
8. ______________ is the extention for the Nurse in case of an emergency during class.
Lab Safety Part B:
1. ______________ You should report all accidents to Mr. Leeds at the end of class.
2. ______________ You should never throw broken glass into the regular trash.
3. ______________ If you get any chemicals on your skin you should flush your skin with water and tell Mr. Leeds.
4. ______________ You can take your goggles off as soon as you finish the lab.
5. ______________ Hot glass looks different than cold glass.
6. ______________ It is ok to use a cracked test tube as long as you are careful.
7. ______________ The Emergency Blankey is used if someone really needs to take a nap.
8. ______________ It is ok to put your goggles up on your forehead \when you clean up.
Lab Safety Part C:
2 important safety tips when working with an alcohol burner (other than wear goggles):
-Never leave a burner
-Cap the flame when your are done
-Be careful picking up your beaker (it will be hot)
2 safety precautions you should take when using chemicals:
-only waft liquids
-don't waft solids/powders
-don't stick your hands in the chemicals
List 1 thing you should do at the end of every experiment (or else you lose points):
-clean your area up completely
List 3 pieces of safety equipment located within the classroom:
-eye wash/shower station
What is the emergency blanket used for?
to put out a fire on your body.
Lab: Reaction in a Bag
1. What did the red liquid use to measure the acidity? A ph indicator
2. What number turns the liquid yellow? below 7
3. What number turns the liquid pink? above 8
4. What does a ph scale measure? acidity
5. What does the ph scale go from? 0-14
6. What is 0-7-14? Acid, neutral, and alkaline
7. What ph does Lemon juice have? 1.5 ph
8. What ph do Tums have? 10 ph
1. Calcium Chloride (Calcium + Chlorine)
-hydrotropic = attracted to water (absorb water)
-Canned veggies (keeps them from getting mushy)
-electrolyte- in sports drinks
-flavors pickles (salty flavor)
1. Sodium bicarbinate (baking soda)
Lab: Heating Baking Soda
what is the control group? The unheated test tube
what is the experiment group? The heated test tube
What is the indicator? Tea, shows that the heated test tube is not baking soda
What is the variable? Something you try to measure
What is the independent variable? Causes a change in dependent variable, the temperature (heat)
What is the dependent variable? Color of the tea was dependent on the heat
What are the control factors:
-same type of tea
-same amount of tea
-same amount of baking soda
-same stirring time
-same size tubes
What unit of measurement to we measure in? cm3 (cubic centimeter)
-volume times length times width times height
What is the standard unit of length? Meter (m)
What does 1 centimeter equal in cubin centimeters? .01 cm3
Volumes of liquids
What do you use to measure volume? A graduated cylinder
What do you always have to check? the intervals or scale
What do units equal? Millileters (ml) or cubic centimeters
What does 1ml equal? 1cm3
Where do you read from the meniscus? The bottom
What do you have to check? That the pan is clean and dry
What do you always have to do before EACH massing? 0 balance
Where do you have to push all the riders to? 0 (the left)
What do you never do? Switch the pan
What is the only way that you could pick up the balance? By the red bar
What are you not supposed to do when done? zero balance it
1. Why do you think baking soda is used in baking?
When heated, it releases as gas and it causes the dough/batter to rise.
3. How many cubin centimeters of water are reuqired to fill a graduated cylinder to the 50,0-mL mark?
You need 50 cm3 required to fill a graduated cylinder to the 50 mL mark
4. Rectangular box A has greater volume
Shorter length = big volume (doesn't matter)
5. Adding a stone to the graduated cylindr containing 25.0 cm3 of water raises the water level in the cylinder to the 32.0 cm3 mark. What is the volume of the stone?
The volume of the stone is 7mL (displaced)
6. A student has a large number of cubes that measure 1 cm along each edge.
a. How many cubes will be needed to build a cub that measures 2 cm along each edge?
8 cubes (2 cm)
b. How many cubes will be needed to built a cube that measure 3 cm along each edge?
27 cubes (3 cm)
c. What is the volume, in cubic centimeters, of each of the cubes in (a) and (b)?
8 cm3, 27 cm3
7. One rectangular box is 30 cm long, 15 cm wide, and 10 cm deep. A second retangular box is 25 cm long, 16 cm wide and 15 cm deep. Which box has the larger volume?
The second retangular box (B)
8. Figure A shows a cone-shaped graduate used for measuring the volume of liquids. Why are the divisions not equally spaced?
The less the surface, the more the depth. The more the surface, the less the depth.
11.What is the level of the liquid in Figure D(a) to the nearest half division? What is the level in Figure D(b) to the nearest half division?
12. *In class question*
13. *In class question*