Instruments
What is a digital scale used for?
To determine the mass of an object
Units when measuring mass of an object
g - grams
picture of graduated cylinder 1 (light blue)
78 mL
Formula for density
D = M/V
Density = Mass/Volume
What scientific instrument would you use to find the volume of a pen?
Graduated cylinder
Units when measuring volume of a liquid (water)
mL - mililiters
picture of graduated cylinder 2 (dark blue)
38 mL
A water bottle's mass is 30 g. Its volume is 10 cm^3.
What is its density?
300g / 100 cm^3
3 g/cm^3
What measurements can you determine using a ruler?
Length of sides AND Volume of Regular Solids (box)
Units when measuring the volume of a solid object (chess piece)
cm^3 - cubic centimeters/centimeters cubed
The starting volume of water in a graduated cylinder is 12 mL. You add a small eraser into the graduated cylinder and the water rises to 19 mL. What is the volume of the eraser? (include units)
7 cm^3
A 50 mL sample of Gatorade has a mass of 25 grams. What is the density of Gatorade?
25 g / 50 mL = 0.5 g/mL
What is the "Tare" button on a scale used for?
1. "Zero" the scale - makes sure the scale is at 0.0g before placing object on it.
2. When measuring mass of an object/liquid that needs to be placed in a container, you can easily measure its mass without including the mass of the container.
What units do you use for density?
g/cm^3
OR
g/mL
What is the technique used to determine the volume of a irregular object (chess piece, scooby doo figure, etc)?
Water Displacement
A plastic cup has a density of 2 g/cm^3. What is the mass of a plastic cup with a volume of 8 cm^3?
m = D x V
m = 2 x 8
m = 16 g