Page 10 answers
Mass of a Paper Clip
Students measured the mass of 10 small paper clips and recorded a mass of 10.135 grams.
What type of balance should the students use? Why?
Students should use an electronic balance because it provides an accurate measurement of low
masses.
What is the mass of 1 paper clip?
The mass of 1 paper clip is approximately 1.1 grams.
How many paper clips are in 1 kilogram (1000 grams) of paper clips?
If one paper clip is about 1 gram, then there would be a maximum of 1000 paper clips in 1 kilogram.
A gram is approximately the mass of a paper clip.
Mass of 50­ml of Water
Students measured 50 ml of water.
What tool should they use to measure the water? Graduated cylinder
The students placed a 100­ml container on an electronic balance and zeroed the balance.
Why did the students zero the balance?
Zeroing the balance subtracts the mass of the beaker and resets the balance to zero.
The students carefully poured the 50 ml of water into the container on the balance. The mass of the
water was 50 grams.
What is the mass of 1 ml of water? 1 gram
What is the mass of 1 liter of water? 1 gram/ml X 1000 ml = 1 kilogram
Density of Water
If the mass of 50 ml of water is 50 g, what is the density of water? 50 g/50 ml = 1 g/ml
Volume of a Rectangular Solid
What tool should be used to measure the dimensions of
the rectangular solid shown to the left? Why?
a metric ruler because the longest side is less than 12
inches in the English system
What is the volume of the rectangular solid?
10 cm X 5 cm X 20 cm = 1000 cm3
If the mass of the box is 500 grams, what is the density of
the rectangular solid?
500 grams/1000 cm3 = 0.5 g/cm3
Would it sink or float in water? Explain.
The density of the rectangular solid is less than the density
of water. It should float.
Temperature
What is 72O F in Celsius and Kelvin? Show the calculation formula used to find each conversion.
(72 ­ 32) X 5/9 = 22.2O C
22.2 + 273 = 295.2 K
In August 2011, it was 30O in Kyoto, Japan, as reported during the local Japanese television news
broadcast. Does Japan report temperatures in Celsius or Fahrenheit? Explain your answer.
Japan is in the northern hemisphere. August is summer in the northern hemisphere. It is was more
likely to be hot in the latitudes where Japan is located. A temperature of 30O F would be below the
freezing point of water. The temperature is probably in Celsius.
The zero point of the Kelvin scale is set at absolute zero, the theoretical coldest possible temperature.
What advantage does the Kelvin scale have compared to the Celsius or Fahrenheit scale?
There are never any negative temperatures in the Kelvin scale. This eliminates complications in
mathematical calculations involving extremely cold temperatures.