In today's experiment, you will be recrystallizing a "dirty" sample of benzoin. Choose the statement that best explains how you will determine your sample?a. The yield of my product is high
b. The appearance of the product matches the literature description
c. The melting point range should be less than 3 C
d. The melting point range matches the literature values.

Answers

Answer 1

Answer:

Answer:The melting point range matches the literature values.

Explanation:

The essence of recrystallization is obtaining the sample in its purest form. This purest form must have the exact properties of the compound as reported in literature. The melting point is part of the means of identifying a pure compound. A pure compound must have a sharp melting point which corresponds with literature reports. Hence the melting point is quite a good means for determining a sample.

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Where are the protons and neutrons and electrons located in an atom?

Answers

The protons and neutrons are located in the nucleus of an atom, while the electrons are located in the orbital cloud.

Final answer:

Protons and neutrons are found in the nucleus of an atom while electrons are found in orbitals surrounding the nucleus. The number of protons determines the type of element the atom is.

Explanation:

In an atom, protons and neutrons are located in the nucleus, which is the central part of the atom. The electrons on the other hand, are situated in the areas around the nucleus called electron shells or orbits. Protons carry a positive charge, neutrons are neutral, and electrons carry a negative charge. The number of protons in an atom is what determines the atomic number and thus, the type of element it is.

Learn more about Atom structure here:

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Steel is made mostly of iron and carbon, though sometimes it can containa. tin.
b. nickel.
c. brass.
d. cadmium.

Answers

The correct answer is B. Steel is made mostly of iron and carbon, though sometimes it can contain nickel. Alloying elements are being added to steel to modify and enhance the characteristics of the steel. Other elements include manganese, chromium, boron, titanium, etc.

Answer:

Taskmasters is Correct. The answer is Choice B.

I just took the quiz and got it Correct.

what is the molarity of a concentrated hbr solution if the solution is 27.7% hbr by mass and has a density of 1.24 g/ml

Answers

Answer:
M = No.of moles of solute / Volume of solution in litres
HBr: H = 1 x 1 = 1 Br = 1 x 80
Molar mass : 81 g / mol
a. n = 27.7% / 100 =0.277 g / (81 g / mol) = 0.0034 mol

density = 1.24 g/ml ; D= m / v

b. 65.32 ml x 1 L / 1000 mL = 0.065 L


c. M= n / V
= 0.0034 mol / 0.065 L
M= 0.052 mol / L

The molarity of the concentrated HBr solution is 0.052 mol/L

How many moles of water will be generated during the combustion of 0.38 moles of methyl alcohol (CH3OH)? 2CH3OH + 3O2 2CO2 + 4H2O

Answers

You already got the balanced equation. So the ratio of mole number is the ratio of the coefficient. Then the ratio of methyl alcohol and water is 2:4=1:2. The water generated is 0.38*2=0.76 mol.

Answer:

0.76 moles

Explanation:

When ________ are added to an atomic nucleus, energy is produced and this is called a fusion reaction.a. protons
b. neutrons
c. protons or neutrons
d. protons, neutrons or electrons

Answers

When neutrons are added to an atomic nucleus, energy is produced and this is called a fusion reaction. The answer is letter B. To be exact, two nuclei combine to produce a more stable nucleus. The positive charge on both nuclei result in a large electrostatic energy barrier to fusion.

The correct answer is c because the nuc are combing more protns and neutrons. The answer suposed to be protons and neutrons NOT PROTONS OR NEUTRONS?!!

Which metal has no reaction with dilute hydrochloric acid or hydrochloric acid and forms a black oxide

Answers

Answer:

lead

Explanation:

lead have no reaction with Hcl unlike aluminum,zinc, magnesium... and it forms a black oxide

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For the amino acid alanine, the major species in solution at pH 7 is the zwitterionic form, which has a negatively charged carboxylic acid group and a positively charged amino group. There is a less common neutral form in which neither group is charged. The carboxylic acid group of alanine has a p K a of 3 . The amino group of alanine has a p K a of 8 . Estimate the ratio of the concentration of the neutral amino acid species to the zwitterionic species at pH 7 .