INTRODUCTION - fill the blank for full creditbank: matter, volume, space, density, property, lighter
DEnsity is the amount of __________ (mass) contained in a unit of ____________. Density is a physical ________
of
matter. Consider 2 identical boxes, one filled with Styrofoam and one
with stones. Trey both occupy the same amount of _________ so they
have the same _________. But the box filled with Styrofoam is
_________. We say
Styrofoam has a smaller __________.
PROCEDURE
you will need: one graduated cylinder having 1mL graduations (that is 1cm3)
1 cylinder , scale plate sensitive to 1g
step1: Fill the cylinder wit water to 30mL mark.
step2: weigh the cylinder with the water. m = ________g
step3: Carefully add a cylinder to the graduated cylinder. Don't spill any water.
reweigh the cylinder with the water and the cylinder. M = ________g
Find the mass of the mass of the cylinder mo = M - m = ________g
step4: Measure the volume of all the material in the cylinder V = _____mL
Find the volume of the cylinder Vo = V - 30mL = __________mL
ANALYSIS1) Find the density of the material that makes up the cylinder: density = mo/Vo = __________g/mL
2) do some research to find out what is the material. (google density of metal)
GOING FURTHER (try without hints. will be on your next test)1)
TO determine the density of a liquid , an empty graduated cylinder is
placed on a balance, and its mass is found to be m= 120g. THe liquid is
the added, up to V= 100cm
3 mark. The cylinder is placed bakc of the balance. If the balance reads now M = 265g, what is the density of the liquid ?
hint: density = mass liquid / volume = (M-m) / V2)
A stone of mass 30 grams is placed in a measuring cylinder containing
some water. The reading of the water level increases from 50cm
3 to 60cm
3. WHat is the density of the stone?
hint: density = mass of the stone/volume of the stone3) A clump of metal weighing m= 351.4 g is dropped into a cylindrical container, causing the water level to rise
H= 1.1 cm. The radius of the base of the container is R= 3cm.
A) find the volume of water displaced. The volume of a cylinder is (Area of the base x height). base = circle.
hint: Volume = пR2 x H with H =1.1 and R = 3cm, п = 3.14, units are in cm3B) What is the density of the metal ?
hint: density = mass(g)/volume(cm3 )C) Given the the table, and assuming the metal is pure, what is the metal ?
| Metal | DEnsity | Metal | DEnsity |
| Aluminum | 2.81 g/cm3 | Nickel | 8.89 g/cm3 |
| Copper | 8.97 g/cm3 | Platinum | 21.40 g/cm3 |
| Gold | 19.30 g/cm3 | Potassium | 0.86 g/cm3 |
| Lead | 11.30 g/cm3 | Silver | 10.50 g/cm3 |
| Lithium | 0.54 g/cm3 | Sodium | 0.97 g/cm3 |
4) When you put a rock into a container of water, it raises the water level H= 3cm. If the container is a rectangular prism
whose base measures 15cm x 15cm (width x length) . What is the volume of the rock ?
(find the volume of water displaced).
hint: volume of a box = W x L x H5) You drop a solid glass ball into a cylinder with a radius of R= 6cm, raisin the water level H =1cm.
WHat is the volume of the glass ball ?
hint; volume of water displaced = base x height = пR2 x H6)
A fish tank 10 (W) by 14 (L) by 12 inches (H) high is the home of
a large goldfish named columbia. She is taken our when her owner cleans
the tank, and the water level in the tank drops h= 1/3 inch. What
is Columbia's volume ?
hint: water displaced = W x L x h7)
Sherlock holmes rushes to his chemistry lab, takes a mysterious
medaillon from his case, and weighs it . It weighs 3088g. Now, le;ts
check its volume. He pours water into a gradiated glass container with
a 10 by 10 square base, and records the water level, which is 53cm. He
places the medaillon into te container and reads the new water velvel,
54.6 cm.
He enjoys a few minutes of mental calculations, then turnds to Dr. Watson. "THis confirms my theory"
"Holmes, you amaze me. Is is gold ? questions the good doctors.
"If it has a density of 19.3 grams per cubic centimeter, it is gold "smiles Mr. Holmes.
What do you think? Is it gold ?
