The Archimedes Principle and Volume Change in Water

In summary, the volume of 124.5 g of ethanol is not given. The final water level in the graduated cylinder indicates that the total number of milliliters is 173.5 mL. The depth of the zinc is 0.66 cm. The conversion of 7.06e-8 nanometers to meters is 7.06x10-17 m. The water displaced by the zinc in problem 2 has a volume of 33.6 mL, and this volume change is significant because it can be used to calculate the density of the zinc.
  • #1
parwana
182
0
1. [1pt]

What is the volume in milliliters of 124.5 g of ethanol ?



2. [1pt]

A piece of zinc having a mass of 141.5 g is placed in an empty graduated cylinder.
32.0 mL of water is then poured slowly and carefully into the same cylinder. The final water level would indicate what value for the total number of milliliters in the graduated cylinder ?


3. [1pt]

The piece of zinc in the above question has a length of 7.00 cm and a width of 2.80 cm &nbsp. What is the depth of the metal (ie, the third dimension) in centimeters. Use Table 1.1 for reference. Report your answer to two decimal places.

4.
Convert 7.06e-8 nanometers to meters.

1 Nanometer= 10^-9, so would it be 70.6 meters??
 
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  • #2
Hint: Density = Mass / Volume, or Volume = Mass / Density

For the last one = 1 nm = 1x10-9 m,

so 7.06x10-8 nm = how many meters?
 
  • #3
i'm assuming you're able to look up the density of the various objects?

consider the archimedes principle for problem 2. when an object is placed in a less dense liquid, the object will sink. there isn't enough force from the liquid pushing up on the object. what happens to the water the object has displaced? what's the significance of the volume change in the water?
 

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