## Density Lab B

Test your knowledge of various Science Olympiad events.
NewSciolyer
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### Re: Density Lab B

waterboy wrote:
February 25th, 2020, 7:11 am
NewSciolyer wrote:
February 24th, 2020, 3:12 pm
Okay I'll post a few:

1) How is molality affected by temperature?

2) A sample of gas occupies a volume of 11.1 L at 1.23 atm and 0.0 degrees Celsius. What volume does the sample of gas occupy at 3.15 atm and 100.0 degrees Celsius?

3)All of the below are types of densities except:
a) Mass density
b) Number density
c) Area density
d Volume density
1) Molality is not affected by temperature
2) 5.92 L
3) d-Volume density

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### Re: Density Lab B

1) A bronze alloy is made of two metals. Tin makes up about 12% of the alloy with a density of 7.365g/cm^3 and the copper makes up the rest with a density of 8.96g/cm^3. What is the density of bronze using these numbers?

2) A 4-gram sugar cube (sucrose: C12H22O11) is dissolved in a 350-milliliter cup of hot water. Find the molarity of the sugar solution.

3) 6200 mL of an ideal gas is contained at 3.0 atm and 37 °C. How many moles of this gas are present?
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### Re: Density Lab B

waterboy wrote:
February 25th, 2020, 7:27 pm
1) A bronze alloy is made of two metals. Tin makes up about 12% of the alloy with a density of 7.365g/cm^3 and the copper makes up the rest with a density of 8.96g/cm^3. What is the density of bronze using these numbers?

2) A 4-gram sugar cube (sucrose: C12H22O11) is dissolved in a 350-milliliter cup of hot water. Find the molarity of the sugar solution.

3) 6200 mL of an ideal gas is contained at 3.0 atm and 37 °C. How many moles of this gas are present?
1) 8.77 g/cm^3 (3 significant figures)
2) 0.0334 M (3 significant figures)
3) 0.73 moles (2 significant figures)
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### Re: Density Lab B

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Dwu1011
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### Re: Density Lab B

Ok so I'll just go, since nobody else wants to go.
A rigid balloon of negligible mass has a volume of 0.32 m3 and has been evacuated. Argon gas is pumped into the balloon at a rate of 0.05 m3/s. The density of Argon gas is 1.784 g/L and the density of air is 1.23 g/L. How long until the balloon begins to sink?
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waterboy
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### Re: Density Lab B

Dwu1011 wrote:
March 2nd, 2020, 4:01 pm
Ok so I'll just go, since nobody else wants to go.
A rigid balloon of negligible mass has a volume of 0.32 m3 and has been evacuated. Argon gas is pumped into the balloon at a rate of 0.05 m3/s. The density of Argon gas is 1.784 g/L and the density of air is 1.23 g/L. How long until the balloon begins to sink?
Not sure if this is correct
15 seconds
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### Re: Density Lab B

Is the balloon filled with nothing or with air in the beginning, bc if it were filled with air wouldn't it just sink immediately?
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### Re: Density Lab B

@waterboy i dont think that the answer is right bc 15 seconds would fill up 0.75 m3 of the balloon which has a rigid shape and volume of 0.32 m3. I got around 4.41 seconds. I dont know how to hide my answer but dont grill me cuz its probably wrong anyway
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### Re: Density Lab B

Hi Fallsbury!!!!!

Dwu1011
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### Re: Density Lab B

Fallsbury wrote:
March 2nd, 2020, 6:41 pm
@waterboy i dont think that the answer is right bc 15 seconds would fill up 0.75 m3 of the balloon which has a rigid shape and volume of 0.32 m3. I got around 4.41 seconds. I dont know how to hide my answer but dont grill me cuz its probably wrong anyway
Yup! 4.41 seconds is correct! your turn.
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