Density, Dimensional Analysis, & Significant Figures Flashcards

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1
Q

What is density?

A

Density is the comparison of how much matter there us in a certain amount of space.

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2
Q

What is the Density Formula and Triangle?

A

density = mass/volume triangle= mass- top & Density - left bottom & Volume - right bottom

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3
Q

When would you use the displacement method?

A

It is used for accurately measuring the volume go an odd shape.

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4
Q

What are the steps of the displacement method?

A
  1. Partially fill your graduated cylinder with water. (note the initial volume)
  2. Gently insert the object into the cylinder ( note the final volume)
  3. Calculate the change in volume
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5
Q

Dimensional Analysis #1
Question: A weightlifter can lift 495lbs. How many kg is that? 1kg = 2.2 lbs

A

Answer: 495lbs (1kg/ 2.2lbs) = 495/2.2 = 225 kg

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6
Q

Dimensional Analysis #2
Question: If a space shuttle can travel 17,000 miles per hour, how many meters can it travel per second.

A

Answer: (17000 miles/1hr) (1.609km/1mile) (1000m/1km) (1hr/60min) (1min/60sec) = 7.6 x 10 3rd m/s

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7
Q

What are the steps to finding the significant figure?

A
  1. count all integers not including zeros
  2. count all zeros that occur between integers
  3. Leading zeros are not significant
  4. only count if the is a decimal next to the trailing zeros
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8
Q

Significant Figure #1
Question: 0.002000

A

Answer: 4

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9
Q

Significant Figure #2
Question: 800

A

Answer: 1

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