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# Questions of density and volume

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In my lab I determined volumes for two unknown metals by two different methods (displacement in a liquid: V=9ml vs. calculation of all sides: V=8.83 cm3

V=5ml V=4.75 cm3

The volumes are not the same. Which do you believe to be more accurate? Why?

2. What effect a higher erroneous volume of unknown will have on dessity determination? (will the object appear to be denser?, less dense?)

3. I also have two different densities obtained by two different methods:
A) displacement in a water D=9.2g/ml (for one unknown metal) and
D= 10.1 g/ml (for another unknown metal)
B) calculation of all sides: D= 9.4 g/cm3
D= 10.6 g/cm3
They not a same. Is this to be expected considering the volume values I obtained?

4. Is it possible for two different elements to have the same volumes and densities but different masses? Why?

5. If you were asked to find the density of a paper clip made of iron, which method of volume measurement would you use, displacement in a liquid vs. measurement and calculation of all sides? Why?

https://brainmass.com/chemistry/stoichiometry/questions-of-density-and-volume-96463

#### Solution Preview

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2. What effect a higher erroneous volume of unknown will have on dessity determination? (will the object appear to be denser?, less dense?)

density (d) is defined as the mass (M) per unit volume (V):

d = M/V

Thus, an increase in the volume will cause a decrease in the density (the object will appear to be less dense).

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3. I also have two different densities obtained by two different methods:
A) displacement in a water D=9.2g/ml (for one unknown metal) and
D= 10.1 g/ml (for another unknown metal)
B) calculation of all sides: D= 9.4 g/cm3
D= 10.6 ...

#### Solution Summary

This solution gives step by step explanations for various questions involving density and volume.

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## Mass, Volume, Density and Vernier Questions

Need help with those questions.

Q1) A pile of 500 sheets of paper has a mass of 2 kg. The pile is 300mm long, 200mm wide and 50 mm thick. Calculate
a) the thickness of the sheet
b) the mass of one sheet.
c) The volume of the pile
d) The density of the paper
e) The mass of a one square metre sheet of this paper.

Q2) A plastic bag filled with air has a volume of 0.008m3. When the air in the bag is squeezed into the rigid container, the mass of the container (with air) increases from 0.02 to 0.03kg . Calculate the density of the air in the bag.

Q3) The density of air is 1.3 Kg/m3 . Calculate the loss in the mass of a 5 litre flask when the air inside the is removed by a vacuum pump.( 1 litre = 1000 cm3 or 1.0 X 10-3 m3)

Q4) How many ml are there in 1 m3?

Q5) How many cm3 are there in 1 m3?

Q6) density of following substances in g/cm3.

Copper 8.9
Iron 7.9
Kerosene 0.87
Mercury 13.6
Water 1.0

1cm3 of mercury has a greater mass than 1 cm3 of any other substance in this table
- True or False

1cm3 of water has a smaller mass than 1 cm3 of any other substance in this table
- True or False

1g of iron has a smaller volume than 1g of copper.
- True or false

1g of mercury has a greater mass than 1g of copper.
- true or false

Q7) Explain hoe to take readings with vernier caliper if both the scales are in millimeters.

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