CHEMISTRY MIDDLE SCHOOL

If we want to produce pure aluminum (Al) using AlCl3 as a reactant, what other reactant should we use? A. Fe
B. Ni
C.Li

Answers

Answer 1
Answer:  I would say Li.  Then your balanced equation would look like this AlCl3+ Li-> Al + LiCl
Answer 2
Answer: Answer is letter b hjjjj

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MIDDLE SCHOOL

Please help. QUICK LIMITED TIME How is the energy of a nuclear reactor converted to electricity?

A)The nuclear reactions produce electrical energy directly.
B)Heat powers an electrical generator directly.
C)Steam converts mechanical energy to electricity.

Answers

The energy of a nuclear reactor gets converted to electricity by using steam. As steam converts mechanical energy to electricity.

Answer: Option C

Explanation:

Nuclear reaction works on the principle of nuclear fission. The main functioning of nuclear reactor is the generation of neutrons by fission of Uranium oxide.

The rate of generation of neutrons need to be controlled in the reaction to have a controlled chain reaction which is suitable for generating electricity.

So, the controlling of rate of nuclear generation is done by moderators. The moderators are generally water or graphite in any nuclear reactor. So during these process, steam is produced in the reactor core which then flows through a turbine engine.

The steam rotates the turbines in the generator and thus the mechanical energy of the turbine during rotation is converted as the electrical energy in the generator.

Answer:

c

Explanation:

HIGH SCHOOL

Place the following covalent bonds in order from least to most polar: a. H-Cl b. H-Br c. H-S d. H-C

Answers

Answer:


The Order is as follow,

                                     C-H < S-H < H-Br < H-Cl


Explanation:

                      Polarity depends on the electronegativity difference between two atoms, greater the electronegativity difference, greater will be the polarity of bond and vice versa.


Electronegativity Difference between Hydrogen and other given elements are as follow,


1) C-H;

               E.N of Carbon     = 2.55

               E.N of Hydrogen = 2.20

                                           ------------

               Difference              0.35


2) S-H;

               E.N of Sulfur       = 2.58

               E.N of Hydrogen = 2.20

                                           ------------

               Difference               0.38


3) H-Br;

               E.N of Bromine   = 2.96

               E.N of Hydrogen = 2.20

                                          -------------

               Difference              0.76


4) H-Cl;

               E.N of Chlorine   = 3.16

               E.N of Hydrogen = 2.20

                                           -----------

               Difference               0.96


Hence it is proved that the greatest electronegativity difference is found between H and Chlorine in H-Cl, therefore it is highly polar bond and vice versa.

COLLEGE

Grignard reagents are air-and moisture-sensitive. List at least threereactants, solvents, and/or techniques that were utilized in the experimental procedure to minimize exposure of the reactants to air and/or moisture.

Answers

Diethylether (DTH) andTetrahydrofuran (THF).

Explanation:

  • Grignard reactions reacts with water forming alkanes.
  • The water present causes the reagent to decompose rapidly.      
  • So, the solvents which are utilized in the experimental procedure to minimize exposure of the grignard reagents to air and/ormoisture are solvents such as anhydrous diethyl ether or tetrahydrofuran(THF), poly(tetramethylene ether) glycol (PTMG).
  • The reason for the use of these solvents is the oxygen present in these solvents stabilizes the magnesium reagent.
  • THF (Tetrahydrofuran) is a stable compound.
HIGH SCHOOL

Why is caffeine more soluble in dichloromethane compared to water?

Answers

Partial polar nature of Caffeine make it more soluble in less polar solvent such as dichloromethane as compared to water.

Why is caffeine more soluble in dichloromethane?

Caffeine is partially polar and we know that water is more polar solvent than dichloromethane which causes caffeine more soluble in dichloromethane compared to water so we can conclude that partial polar nature of Caffeine make it more soluble in less polar solvent such as dichloromethane as compared to water.

Learn more about caffeine here: brainly.com/question/26670237

Answer:

Caffeine would require a non-polar solvent to dissolve it

Explanation:

The general rule of solubility is that "like dissolves like". Polar solvents would dissolve polar solutes and non-polar solvents would dissolve non-polar solute.

Water is a polar solvent and would readily dissolve polar compounds such as the range of ionic/electrovalent compound like NaCl and polar covalent compounds.

For non-polar solutes, compounds like dichloromethane would readily dissolve them. Both caffeine and this solvent are both organic compound and would interact readily with one another. Although this compound is slightly polar, it would readily dissolve caffeine

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