CHEMISTRY MIDDLE SCHOOL

What holds the ions together in galena?

Answers

Answer 1
Answer: It might be  electromagnetic force

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HIGH SCHOOL

Assuming 100% dissociation, calculate the freezing point and boiling point of a 2.5 m SnCl4 (aq)

Answers

Answer:The freezing point of the solution is 249.75 K and boiling point of the solution is 379.4 K.

Explanation :

Molality of = 2.5

a) Depression in freezing point:

i = Van'T Hoff factor =  5 (for 100% dissociation)

= freezing point constant= 1.86Kkg/mol

The freezing point of the solution is .

b) Elevation in boiling point:

i = Van'T Hoff factor =  5 (for 100% dissociation)

=boiling point constant= 0.512 Kkg/mol

The boiling point of the solution is .

100% dissociation means you have Sn^4+ + 4Cl^-, giving you an i (or van't Hoff factor) of 5. You're in an aqueous solution, so we know that water freezes at 0C, and boils at 100C. The equation you're looking for is:

ΔT=iKfm

Where i = van't hoff factor, Kf = freezing point depression constant, and m = molality. Kf is a constant, 1.86 °C kg/mol i is 5 as stated above molality.... 2.5 moles SnCL4 per 1 L water, want molality (mol solute/kg solvent) 1L water = 1000g at standard temp/pressure. 1.000kg 2.5 mol SnCl4/1.000kg H2O = 2.5m Temp change = 5 (unitless) * 25 mol/kg * 1.86 °C kg/mol Temp change = 23°C So the freezing point is now -23°C because adding solutes lowers the freezing point. Boiling point, same business except the constant changes, as does whether you add/substract your change in temperature.

ΔT=iKbm Kb = 0.512 °C kg/mol Temp change = 5 * 2.5 mol/kg * 0.512 °C kg/mol = 6.4 °C Your new boiling point is 106°C. Viola! Hope this helped.
HIGH SCHOOL

The reaction 2A → A2​​​​​ was experimentally determined to be second order with a rate constant, k, equal to 0.0265 M–1min–1. If the initial concentration of A was 2.00 M, what was the concentration of A (in M) after 180.0 min?

Answers

Answer:

0.19M

Explanation:

2A → A2​​​​​

Rate constant = 0.0265 M–1min–1

Initial concentration = 2.00 M

Final Concentration = ?

time, t =  180min

The formular relating the parameters is given as;

1 / [A] = kt + 1 / [A]o

1 / [A] = 0.0265 * 180 + (1 / 2)

1 / [A] = 4.77 + 0.5

[A] = 1 / 5.27 = 0.19M

HIGH SCHOOL

Why do molecular compounds have low melting points and low boiling points relative to ionic substances??

Answers

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, molecular compounds have low melting points and low boiling points relative to ionic substances.

What is chemical Compound?

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Molecular compounds possess weak interaction between bonds. these have low melting and boiling points.

Therefore, molecular compounds have low melting points and low boiling points relative to ionic substances.

To learn more about chemical compound, here:

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Because molecular bonds are not as strong as ionic bonds, they require less energy (heat) to break apart. This translate to less heat being required to move from one state to the next (melting, boiling, freezing, condensing) and thus a lower melting and boiling point.
COLLEGE

In the arrangement of particles within any atom, the outermost sort of particle is always the:________

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Answer:

In the arrangement of particles within any atom, the outermost sort of particle is always the electron.

Explanation:

An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.

All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other.

The electron is subatomic particle that revolve around outside the nucleus and has negligible mass. It has a negative charge.

Symbol= e-

Mass= 9.10938356×10-31 Kg

It was discovered by j. j. Thomson in 1897 during the study of cathode ray properties.

While neutron and proton are present inside the nucleus. Proton has positive charge while neutron is electrically neutral. Proton is discovered by Rutherford while neutron is discovered by James Chadwick in 1932.

Symbol of proton= P+  

Symbol of neutron= n0  

Mass of proton=1.672623×10-27 Kg

Mass of neutron=1.674929×10-27 Kg

COLLEGE

Which of the following is a FALSE statement about carbohydrates? Glycogen is a complex carbohydrate formed by dehydration synthesis of glucose molecules. Carbohydrates consist of monomers called simple sugars. Dietary glucose is primarily used to drive our metabolic pathways that produce energy. The chemical composition of carbohydrates includes two oxygens and one hydrogen for every carbon present.

Answers

Answer:

The chemical composition of carbohydrates includes two oxygens and one hydrogen for every carbon present.

Explanation:

Generally, each carbon atom in the carbohydrates has one oxygen molecule and 1 – 3 hydrogen (depending on the position of the carbon in the chain and also the types of bonds around it). Usually, the ratio of hydrogen to oxygen in carbohydrates is approximately 2:1 Example of carbohydrates are starch and glycogen.

MIDDLE SCHOOL

What is the difference between repetition and replication of an investigation

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  • Repetition of an investigation is simply the repeat of a process, possibly to get a different or new result.

  • Most people repeat investigations because they were not satisfied with the result of the first investigation.

  • Replication of investigation is simply a situation where a person wants to try and remake the processes and the result of the investigation of another person, or his own.

  • This is usually done when a person wants to find out how a person got the type of result he got and if any external factor influenced the result of the investigation or experiment.

  • Therefore, while repetition is used to repeat a process, replication of an investigation is done to produce the same or similar results of a previously done investigation.

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Repetition is repeating the same investigation over and over again . Such as you doing an experiment and redoing to to see if you get the same results  however it is often confused with replication . Replication is when you copy an experiment done by someone else . Such as seeing an experiment and trying to get the same results as someone . Repetition you often do yourself while replication you copy someone else .
COLLEGE

Which of the following solutions will have a pH of 1? 1.0M CH3CO2H
0.1M CH3CO2H
0.1M HF
0.1M HNO3
0.1M NH3

Answers

It's 0.1 HNO3 because it's a strong acid
HIGH SCHOOL

What noble gas element has the same number of electrons as O-2

Answers

The noble gas element that has the same number of electrons as O2 would be hydrogen2
HIGH SCHOOL

Based on the crystal-field strengths cl- < f- < h2o < nh3 < h2nc2h4nh2, which octahedral ti (iii) complex below has its d-d electronic transition at shortest wavelength?

Answers

There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, Cl  will give the longest d-d transition when complexed with Ti(III).

What is periodic table?

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.

Cl is the weak field ligand and thus make minimum splitting of d orbitals. So, it  will give the longest d-d transition when complexed with Ti(III).

Therefore, Cl  will give the longest d-d transition when complexed with Ti(III).

Learn more about periodic table, here:

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Based on the crystal field strength, Cl ligand would give the longest d-d transition when complexed with Ti(III). as this is the weak field ligand and would cause minimum splitting of d orbitals.
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