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strojnjashka [21]
3 years ago
12

Chemistry Lab Question: Filtration

Chemistry
1 answer:
tatyana61 [14]3 years ago
6 0

For the first question, salt is soluble while sand is insoluble or not dissolvable in water. The salt should have vanished or melted, but the sand stayed noticeable or visible, making a dark brown solution probably with some sand particles caught on the walls of the container when the boiling water was put in to the mixture of salt and sand. The solubility of a chemical can be disturbed by temperature, and in the case of salt in water, the hot temperature of the boiling water enhanced the salt's capability to melt in it.

For the second question, the melted or dissolved salt should have easily made its way through the filter paper and into the second container, while the undissolved and muddy sand particles is caught on the filter paper. The size of the pores of the filter paper didn’t change. On the contrary, the size of the salt became smaller because it has been dissolved which is also the reason why it was able to go through the filter paper, while the size of the sand may have doubled or even tripled which made it harder to pass through.

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Calculate the frequency and wavelength for a photon of light with an energy of 3.2x10-19 J.
tamaranim1 [39]

Answer:

wavelength = 6×10⁻⁷m

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Frequency of photon = ?

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E = h.f

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A chemist prepares a solution of barium chloride by measuring out of barium chloride into a volumetric flask and filling the fla
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Answer:

30 μmol/L

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<em>A chemist prepares a solution of barium chloride by measuring out 8.9 μmol of barium chloride into a 300mL volumetric flask and filling the flask to the mark with water. </em>

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The chemist has 8.9 μmol of solute (barium chloride) and he adds water until the mark of 300 mL in the container, which is the volume of the solution. We will need the conversion factor 1 L = 1000 mL. The concentration of barium chloride in μmol/L is:

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