Lab safety
Flammable materials should never be used near ______________
fire/open flames/heat
When heating a substance in a test tube you should always point the open end __________
away from others
How you treat items in the lab (or in life)
respectfully/with respect
You have one giant Hershey bar and a regular size Hershey bar. They have the same ingredients. Is the density the same for the bars? Why or why not?
Yes!
How many variables should we change during an experiment?
One variable
What do we do when we want to smell an unknown chemical?
WAFT!
What should you do if someone in your lab group gets something in their eye?
Help them to the eyewash station and help them hold their eyes open in the stream
True or False
Personal glasses are just as good as safety googles, a face shield, or safety glasses
False
What is the formula for density?
Mass/Volume
An ecologist wants to investigate the effects of pollution on soybean plants. The scientist grows five groups of plants and exposes them to various pollutants. The ecologist observes the growth of the plants for one month. What is the IV?
The various pollutants
When should approved eye protection devices be worn in the lab?
When using liquids, heat, or glassware.
what should you do if you have been injured in the lab (cut, burn, etc.)?
inform the teacher immediately and don't panic. Follow accident procedures. Wash cuts with soap and water, flood burns with cold water for several min.
All chemicals should be considered...
Dangerous (even basic ones like salt or sugar!)
Find the density of an object with a mass of 25 g and a volume of 2 cm3.
12.5 g/cm3
An ecologist wants to investigate the effects of pollution on soybean plants. The scientist grows five groups of plants and exposes them to various pollutants. The ecologist observes the growth of the plants for one month. What is the DV?
The growth / height of the plant
When should you wash your hands?
before leaving the lab or when done
when gathering glassware and equipment for an experiment, you should ________
be careful and check for cracks and broken glass.
Make sure it is clean
Read/ listen to instructions
list 2 lab rules for clothing in the lab.
No baggy or ripped clothing.
No open toed shoes
Put up long hair
wear goggles & gloves
Find the density of an object with a mass of 10 g and a volume of 30 cm3. Does it float or sink in water?
.33 g/cm3
Floats in water
An ecologist wants to investigate the effects of pollution on soybean plants. The scientist grows five groups of plants and exposes them to various pollutants. The ecologist observes the growth of the plants for one month. Name 3 constants.
type of soil, amount of water, amount of sunlight
if you hair is long, before lab you should_____
tie it back
When should you light a burner?
Only when directly supervised by a teacher
True or false: It's okay to run around and jump on each other in the lab
False! Extremely unsafe behavior
How do you find the volume of a cube that measures 5 cm on each side?
Multiply length x width x height
125cm3
On which axis is the independent variable plotted? What about the dependent variable?
X axis = IV
Y axis = DV