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fredd [130]
4 years ago
12

A student performs two melting-point determinations on a crystalline product. In one determination, the capillary tube contains

a sample about 1–2 mm in height and the melting range is found to be 141°– 142°C. In the other determination, the sample height is 4–5 mm and the melting range is found to be 141°–145°C. Explain the broader melting-point range observed for the second sample. The reported melt- ing point for the compound is 143°C.
Chemistry
1 answer:
Firlakuza [10]4 years ago
7 0

Answer:

the second sample has a broader range because it has more impurity by percentage

Explanation:

separation techniques

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Molar mass of sodium chloride is 22.99 g/mol (Na+) + 35.45 g/mol (Cl-) = x g/mol. Then take the mass of sodium chloride sample 5 grams and divide by molar mass to get the number of moles. Take this number and multiply it by Avogadro’s number (6.22*10^23 molecules/mol). You now have the amount of molecules in 5 grams of NaCl.

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3 years ago
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What is wrong with or ambiguous about the phrase "four molecules of NaCl"?
Alex787 [66]

Answer:

the NaCl is not considered a molecula

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3 years ago
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P_1 = initial pressure of gas = 0.98 atm

P_2 = final pressure of gas = 1 atm  (at STP)

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T_1 = initial temperature of gas = -34.0^oC=273-34.0=239.0K

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8 0
3 years ago
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pochemuha

Answer:

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Ionic bonding is observed because metals have few electrons in their outer-most orbitals. By losing those electrons, these metals can achieve noble gas configuration and satisfy the octet rule. Similarly, nonmetals that have close to 8 electrons in their valence shells tend to readily accept electrons to achieve noble gas configuration. In ionic bonding, more than 1 electron can be donated or received to satisfy the octet rule. The charges on the anion and cation correspond to the number of electrons donated or received. In ionic bonds, the net charge of the compound must be zero.

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4 0
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The base unit of measurement of liquids and volume.
Gemiola [76]

Answer:

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Explanation:

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