density review n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Density Review PowerPoint Presentation
Download Presentation
Density Review

Loading in 2 Seconds...

play fullscreen
1 / 49

Density Review - PowerPoint PPT Presentation


  • 145 Views
  • Uploaded on

Density Review. Mrs. O’Rourke September, 2006. Density of different items: Gasoline—0.7 g/ml Water—1.0 g/ml Aluminum—2.7 g/cm 3 Iron—7.3 g/cm 3 Silver—10.5 g/cm 3 Lead—11.3 g/cm 3 Gold 19.3 g/cm 3.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Density Review' - erol


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
density review

Density Review

Mrs. O’Rourke

September, 2006

question 1
Density of different items:

Gasoline—0.7 g/ml

Water—1.0 g/ml

Aluminum—2.7 g/cm3

Iron—7.3 g/cm3

Silver—10.5 g/cm3

Lead—11.3 g/cm3

Gold 19.3 g/cm3

Mercury, a metallic liquid element, has a density of 11.3 g/ml. If you placed the metals listed to the left in mercury, draw and label a graduated cylinder that shows what would happen?

Question #1
question 1 answer
Question #1 Answer
  • The column should show that all would float, except gold. The lead could be shown as suspended in the mercury.
question 2
Question #2
  • Which of the following would float on pure water?
    • A. A substance with a mass of 1.33 g and a volume of 1.38 mL.
    • B. A substance with a volume of 3.35 mL and a mass of 22. 64 g.
    • C. A substance with a volume of 436.2 mL and a mass of 418.23 g.
    • D. A substance with a mass of 534.23 g and a volume of 522.3 mL.
question 2 answer
Question #2 Answer
  • Both A and C would float on water.
question 3
Question #3
  • Mass is equal to ????, while volume is equal to ?????
    • A. Density/volume; mass/density
    • B. Density/volume; mass X density
    • C. Density X volume; mass X density
    • D. Density X volume; mass/density
question 3 answer
Question #3 Answer
  • D; mass is equal to density X volume; volume is equal to mass/density.
question 4
Question #4
  • Alicia has a pure gold coin that has a mass of 120.24g. Gold has a density of 19.3 g/cm3. What is the volume of the coin?
question 5
Question #5
  • When water freezes it expands it’s volume by 7%. What is the density of ice?
    • 0.30 g/mL
    • 1.7 g/mL
    • 1.07 g/mL
    • 0.93 g/mL
question 6
Density of different items:

Gasoline—0.7 g/ml

Water—1.0 g/ml

Aluminum—2.7 g/cm3

Iron—7.3 g/cm3

Silver—10.5 g/cm3

Lead—11.3 g/cm3

Gold 19.3 g/cm3

Keshia has 3.0 cm3 of gold, lead, silver, iron, and aluminum. Which of the following is false?

A. All of the samples have different masses

B. The aluminum has the smallest mass

C. The gold has the greatest volume

D. The silver has a mass of 31.5 grams.

Question #6
question 6 answer
Question #6 Answer
  • C; They all have the same volume: 3cm3. Gold would have the most mass.
question 7
Question #7
  • Jose has a 10 cm3 sample of silver while Alicia has a 30 cm3 of silver. Which of the following is false?
    • A. Alicia’s sample has 3 times the volume of Jose’s sample.
    • B. Alicia’s sample has 3 times the density of Jose’s sample.
    • C. Alicia’s sample has 3 times the mass of Jose’s sample.
    • D. Jose’s sample has 1/3 the mass of Alicia’s.
question 7 answer
Question #7 Answer
  • B; density of an object does not change when you ONLY cut it into smaller pieces. You must heat it, cool it, add a solute to the solvent, or increase or decrease the pressure on the substance to change the density.
question 8
Question #8
  • If you heat a sample of gas, the density of the gas:
    • A. Remains the same
    • B. Decreases
    • C. Increases
    • D. Impossible to tell
question 8 answer
Question #8 Answer
  • B; when you heat a gas, the volume expands due to the increase of the speed of the molecules. The mass would stay the same, volume would increase, so density would decrease.
question 9
Question #9
  • An object has these dimensions: The length is 5 cm, the width is 2 cm, and the height is 10 cm. What is the volume?
  • If the object has a mass of 65 grams, what is its density?
question 9 answer
Question #9 Answer
  • 100 cm3; 5 cm X 2 cm X 10 cm
  • .65 g/cm3; 65g/100cm3
question 10
Question #10
  • Your teacher gives you a little block of metal which is exactly 1 centimeter square. It is small, but has a mass of 4.5 grams. What is its density?
question 10 answer
Question #10 Answer
  • 4.5 g/cm3; 4.5g/1cm3
question 11
Question #11
  • A piece of metal has a mass of 3 grams and has a density of 2.70 g/cm3. What is its volume?
question 12
Question #12
  • A piece of foil has a volume of 0.90 cubic centimeters. If the foil is 30 centimeters by 18 centimeters, what is its height.
question 12 answer
Question #12 Answer
  • .0016666 cm
    • 30 X 18 X .0016666 = .90
question 13
Question #13
  • A piece of aluminum foil has a mass of 1.60 grams. It is 30 cm by 10 cm. If we assume that the density of the foil is 2.70 g/cm3, what is the thickness of the foil?
question 13 answer
Question #13 Answer
  • .00197 or .002
question 14
Question #14
  • A furniture maker wants to determine if two pieces of wood are of the same type. He knows that the two woods have different densities. The first piece is 30 X 14 X 2.5 cm and has a mass of 350 grams. The second piece is 15 X15 X 10 cm and has a mass of 900 grams. Are they different types of wood?
question 14 answer
Question #14 Answer
  • yes; the density of the first piece is .33 g/cm3, the density of the second piece is 1.2 g/cm3.
question 15
Question #15
  • When salt is added to water the density increases. Marine biologists use this characteristic to measure the salinity in sea water. A biologist knows that the density of the water must be between 1.05 and 1.08 g/cm3. She finds that 80 mL has a mass of 83.2 grams. Is this water within the limits?
question 15 answer
Question #15 Answer
  • No, It is only 1.04 g/mL, so the salinity level is too low.
question 16
Question #16
  • 28.5g of iron shot is added to a graduated cylinder containing 45.50 mL of water. The water level rises to the 49.10 mL mark. What is the density of iron?
question 16 answer
Question #16 Answer
  • 7.9166 or 7.92 g/cm3
question 17
Question #17
  • A piece of wood that measures 3 X 6 X 4 cm has a mass of 80 grams. What is the density of the wood?
  • Would it float in water?
question 17 answer
Question #17 Answer
  • 1.11 g/cm3
  • No, it will not float. It is more dense than water.
question 18
Question #18
  • A cup of gold colored beads was measured to have a mass of 425 grams. By water displacement the volume of the beads was calculated to be 48.0 cm3. Given the following densities, identify the metal:
  • Gold: 19.3 g/cm3
  • Copper: 8.86 g/cm3
  • Bronze: 9.87 g/cm3
question 19
Question #19
  • Lynn threw a plastic ball into his pool for his dog to fetch. The mass of the ball was 125 grams. What must the volume be to have a density of 0.50 g/cm3. (He wants it to float, of course!)
  • After throwing the ball into the pool, it sprang a leak and began to fill up with water. How many mL of water can the ball absorb before the ball sinks?
question 19 answer
Question #19 Answer
  • The ball must have a volume of 250 cm3.
  • When the ball has absorbed 126 mL it will sink
question 20
Question #20
  • What is the mass of a cylinder of lead that is 2.50 cm in diameter and 5.50 cm long? The density is 11.4 g/cm3.
question 20 answer
Question #20 Answer
  • 97.926 or 97.93 g
question 21
Question #21
  • An ice cube measuring 5.80 cm by 5.80 cm has a density of 0.917 g/mL. What is the mass of the ice cube?
question 21 answer
Question #21 Answer
  • 178.9177 or 178.92 g
question 22
Question #22
  • Gasoline is non-polar liquid that will float on water. 450 grams of gasoline is spilled into a puddle of water. If the density of gasoline is 0.665 g/mL, what volume of gasoline was spilled?
question 23
Question #23
  • A little aluminum boat (mass of 14.50g) has a volume of 450.00 cm3. The boat is placed in a small bucket of water and carefully filled with pennies. If each penny has a mass of 2.50g, how many pennies can be added to the boat before it sinks?
question 23 answer
Question #23 Answer
  • 175 pennies
  • Mass to volume must be greater than 1. 450 mL would need to have just over 450 g to sink. We have 14.5 g. 450 – 14.5 = 435.5g
  • 435.5/2.5 (gram per penny) = 174.2. So you must add 175 pennies to sink your boat.
question 24
Question #24
  • A sample of the mineral pyrite has a mass of 150g and a volume of 30 cm3. What is the density of pyrite?
  • If I cut my sample of pyrite in half; what would its new mass, volume, and density be?
question 24 answer
Question #24 Answer
  • The density of pyrite would be 5 g/cm3.
  • If the sample were cut in half, the mass and volume would as be cut in half; however, the density would not change. New mass: 75g. New volume: 15 cm3.