Scientific Method
What is the first step of the scientific method?
Make observations!
What is the definition of mass?
What is "mass describes the amount of matter in an object"
What is the first thing you should if there is a safety issue in the lab?
What is "tell Ms. de Moor"
What is the definition of volume?
What is "how much space an object takes up"
Where in the classroom is the fume hood and the eyewash station? Point these out if called upon.
(see map diagram)
Is this a good scientific question, why or why not? "Is Lexus a better brand of car than Toyota?"
What is "no, too broad and based on opinion"
Which tool in the lab do we use to measure the mass of an object?
What is "triple beam balance"
What is the name of the piece of equipment that is used to measure volume, but that has a funnel-like opening?
What is "erlenmeyer flask"
What is the name of the unit we use to measure weight?
What is "Newtons"
How would you go about cleaning a test tube?
With soap, water, and a tube brush!
Name 2 characteristics of a good scientific question.
What is "not too broad, can be answered by conducting an experiment, is interesting, has a falsifiable hypothesis, concerns changes in physical objects or energy that can be observed"
What are 3 possible units for density?
What is "g/ml, g/(cm^3), kg/(m^3)"
According to the syllabus, what should a FULL title on a hmwk assignment from the BOOK look like?
Full name
Date
Grade + section
Assignment title
Page & problem numbers
Time spent completing homework assignment
Explain why a person's mass would be the same if they traveled to the moon, but their weight would change.
What is "because weight depends on the gravitational force acting on an object (which changes when you go to the moon), whereas mass describes how much matter is in an object, which doesn't change when you go to the moon"
When there is a fire, when should the teacher use the fire extinguisher? When should s/he not?
Fire elsewhere (trash, counter, table, etc)
Create a scientific hypothesis for the following question: Does eating candy in the morning make you feel tired later in the day?
What is "If you eat candy in the morning, then you will feel tired later in the day"
What is the density of an irregularly shaped plastic toy that displaces 45 mL of water when you place it in a beaker and that has a mass of 70g?
What is "D = m/V, D = 70g/45mL = 1.6g/mL = 1.6g/(cm^3)"
Why does water have surface tension? Draw a couple of water molecules on the white board if called up and explain.
Remember the Mickey Mouse structure of water and the positive charge on the Hydrogen and negative charge on the Oxygen!
We have been using water to find out the volume or irregularly shaped objects. Could you use oil? Why or why not?
What is "yes, you could use oil because using liquid displacement to determine volume works simply because the matter in the object is pushing the matter away in the liquid - they can't occupy the same space. It doesn't matter what type of liquid you use"
If using dangerous chemicals, how should you be dressed in the lab? (you must name ALL in order to get the points)
Goggles
Hair tied back
Gloves
Long pants
Close-toed shoes
If you are testing the impact of fertilizer and water on plant growth, what is the minimum number of experimental trials you could run to test both of those variables?
Sketch out your experimental design on the white board if your team is called on.
9
Demonstrate on the white board how you would algebraically re-arrrange the density equation to isolate volume on one side.
What is "D = m/V --> DxV = m/VxV --> DxV = m --> V = m/D"
What properties of water molecules allowed the astronaut in the video to make a "ball" of water?
What is "attraction between the positive and negative ends of the water molecule, creating surface tension"
How many millimeters cubed are in 1cm cubed?"
What is "there are 10mm in 1cm. Therefore, if you draw a cube 1cm on each side, you can calculate the volume in mm by multiplying, 10mm x 10mm x 10mm = 1000mm^3"
What do the 3 safety symbols presented on the slide by Ms. de Moor warn you about?
What is "dangerous fumes, poisonous, biological hazard"