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3 years ago

In the wintertime, you decide to buy a helium balloon at Dollar Tree. It is fully

Chemistry

2 answers:

irga5000 [103]3 years ago

7 0

Answer:

When the temperature decreases the pressure decreases with it, causing it to crumple or deflate.

Explanation:

Gemiola [76]3 years ago

5 0

Answer:

The reason that the balloon shrinks is because when the temperature drops, helium becomes more dense then it already is. So what happens is that its molecules lose energy, slows down and moves closer together to conserve heat and this decreases the volume inside the balloon because the helium molecules are moving closer together, rather than outward toward the shell of the balloon which cause the balloon to swell then shrink. The gas law that causes this to happen is the Charles law.

Explanation:

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One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(II) carbonate,

alexgriva [62]

The question is incomplete, here is the complete question:

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(II) carbonate, in concentrated sulfuric acid. The sulfuric acid reacts with the copper(II) carbonate to produce a blue solution of copper(II) sulfate. Scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction:

Fe(s) + CuSO4 (aq) → Cu(s) + FeSO4 (aq)

Suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. He adds powdered iron to a 200.mL copper(II) sulfate sample from the plant until no more copper will precipitate. He then washes, dries, and weighs the precipitate, and finds that it has a mass of 95.mg

Calculate the original concentration of copper(II) sulfate in the sample. Round your answer to 2 significant digits.

<u>Answer:</u> The concentration of copper sulfate in the sample is 0.0075 M

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass of copper = 95 mg = 0.095 g (Conversion factor: 1 g = 1000 mg)

Molar mass of copper = 63.55 g/mol

Putting values in above equation, we get:

$\text{Moles of copper}=\frac{0.095g}{63.55g/mol}=0.0015mol$

The given chemical equation follows:

$Fe(s)+CuSO_4(aq.)\rightarrow Cu(s)+FeSO_4(aq.)$

By Stoichiometry of the reaction:

1 mole of copper is formed by 1 mole of copper sulfate

So, 0.0015 moles of copper will be formed by = $\frac{1}{1}\times 0.0015mol=0.0015mol$ of copper sulfate

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}$

Moles of copper sulfate = 0.0015 moles

Volume of solution = 200 mL

Putting values in above equation, we get:

$\text{Molarity of the solution}=\frac{0.0015\times 1000}{200}=0.0075M$

Hence, the concentration of copper sulfate in the sample is 0.0075 M

7 0

3 years ago

Carbon-12, Carbon-13 and Carbon-14 are examples of _______________ of the carbon atom.

Assoli18 [71]

Carbon-12, Carbon-13 and Carbon-14 are examples of isotopes of the carbon atom.

6 0

3 years ago

Read 2 more answers

At 20°C, a 0.756 M aqueous solution of ammonium chloride has a density of 1.0107 g/mL. What is the mass % of ammonium chloride i

Molodets [167]

Answer:

$\%m/m=4\%$

Explanation:

Hello,

In this case, by knowing that the molarity is measured in molal units which are mole per liter of solution and the by-mass percentage demands us to compute the mass of the solution, we proceed by assuming 1 L of solution:

$m_{solution}=1L*\frac{1000mL}{1L}*\frac{1.0107g}{1mL} =1010.7g$

Then, for 1 L of solution, we have 0.756 moles of solute (ammonium chloride), so we compute the grams for those moles by using its molar mass of 53.491 g/mol as shown below:

$m_{solute}=0.756mol*\frac{53.491g}{1mol}=40.4g$

Finally, we compute the by-mass percentage as shown below:

$\%m/m=\frac{m_{solute}}{m_{solution}} *100\%=\frac{40.4g}{1010.7g}*100 \%\\\\\%m/m=4\%$

Best regards.

6 0

3 years ago

What is the percent composition of nitrogen in Ca(NO3)2?

MrMuchimi

Nitrogen in this compound has 2 atoms. 2 multiplied by its mass, 14.007, equals 28.014. Divide 28.014 by the molar mass of calcium nitrate: 28.014/164 = 0.17081. Multiply this by 100 to achieve its percentage: 0.17081 x 100 = 17.08%

8 0

4 years ago

Which statement about a system at equilibrium is true?(1) The forward reaction rate is less than the reverse reaction rate.(2) T

Stells [14]

(3) the forward reaction rate is equal to the reverse reaction rate
hope this helps!

4 0

3 years ago

Read 2 more answers