Measurments
What is a meniscus? At what point do you measure it?
The curve of a liquid in a graduated cylinder. Measures at lowest point.
Find the density of a substance with the mass of 54 g and a volume of 20 mL.
2.7 g/mL
Convert 450 cm to m.
4.5 m
Fill out the density triangle?
Mass on top
Volume & Density on bottom
What is wafting?
A safe way to smell chemicals during a lab.
What does SI stand for? What is an example?
Meter, Kilogram, Kelvin, Mole, Seconds, Liters
What is the volume of an object that has a mass of 105 g and a density of 2.1 g/cm3?
50 cm3
Convert 7200 mL to L
7.2 L
Formula for density
D = Mass / Volume
What two glassware can be used to heat, hold, and mix?
The correct measurement is 32.0 g. Are these measurements accurate, precise, both, none:
32.1 g, 32.2 g, 31.9 g
Both
Find the mass of the object with a volume of 22.3 cm3 and the density of 12.2 g/cm3.
272.06 g
Convert 2.4 kg to mg
2,400,000 mg
Formula for Volume
V = Mass / Density
What is the NFPA Diamond used for? What does red stand for?
Used to show the risks and hazards of a chemical. The red stands for flammability.
Dory and Nemo were counting the number of clown fish that lived in different colored sea anemones. They counted the fish once every week for three weeks. Nemo helped keep track of the data, of course. Dory just kept counting, just kept counting…
What is the independent variable?
The independent variable is time (measured in weeks)
Because it's what changes (week 1, week 2, week 3), and they are observing how the number of clown fish changes over that time.
What is Archimedes' Principle?
The volume of water displaced by an irregularly-shaped, non-buoyant solid equals the volume of the solid.
Convert 0.045 km to cm
4500 cm
Formula for Mass
M = D x V
List 4 types of PPE?
Goggles, gloves, masks, long sleeves, long pants, closed toed shoes, hair tie,
Tony Stark wanted to test the mass of his new suit affected the distance it would fly. He add more equipment before each test flight. As each piece of equipment was added, the suit was tested to determine how far it would fly.
What is the dependent variable of this?
The dependent variable is the distance the suit would fly
Because that’s what depends on the amount of mass added.
A 31.2 g sample of lead is dropped into a cylinder with 3.0 mL of water. The waters leaves rises to 5.2 mL. What is the density of the sample?
14.181 g/mL
Convert 3.2 daL to L
32 L
V object = V final - V initial
What are the three types of exposure?
Ingestion, inhalation, absorption