CHEMISTRY HIGH SCHOOL

Why is a high temperature needed to melt potassium iodide?

Answers

Answer 1

Answer:

Explanation:

Potassium Iodide -

It is a salt , which is made of the ions of potassium and iodine ,

Potassium being the cation , and iodide being the anion .

The ions of this salt are held by strong ionic forces , which hold the ions together very strongly .

Hence , a lot of energy is required to melt the salt , as the bond between the ions is very strong .

Hence , the melting point of this salt , i.e. , Potassium Iodide , is very strong .

Answer 2

Answer: Potassium Iodide have a lot of strong bonds which requires a very high temperature (high energy) to break them and change into a different state of matter.

Related Questions

An evaporation-crystallization process is used to obtain solid potassium sulfate from an aqueous solution of this salt. The fresh feed to the process contains 19.6 wt% K₂SO₄. The wet filter cake consists of solid K₂SO₄ crystals and a 40.0 wt% K₂SO₄ solution, in a ratio 10.0 kg crystal/kg solution. The filtrate, also a 40.0 wt% K₂SO₄ solution, is recycled to join the fresh feed. Of the water fed to the evaporator, 45.0% by weight is evaporated. The evaporator has a maximum capacity of 175. kg water evaporated/s. a) Assume the process is operating at maximum capacity. Draw and label a flowchart and do the degreeof-freedom analysis for the overall system, the recycle-fresh feed mixing point, the evaporator, and the crystallizer. b) Calculate the maximum production rate of solid K₂SO₄, the rate at which fresh feed must be supplied to achieve this production rate, and the recycle ratio kg/h recycled stream to kg/h fresh feed stream.
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How many electrons are in an Fe2+ ion?
(1) 24 (3) 28
(2) 26 (4) 56

Answers

Iron atoms all have 26 protons, however Fe²⁺ and Fe³⁺ only have 24 and 23 electrons, respectively, and elemental uncharged Fe contains 26 electrons.

What is an electron ?

The elementary electric charge of the electron is a negative one, making it a subatomic particle. Due to their lack of components or substructure, electrons, which are members of the lepton particle family's first generation, are typically regarded to be elementary particles.

After the 4s orbitals are full, they fill the 3d orbitals. However, when they are ionized, their electrons only fill the ground state 3d orbitals. Iron (II) ion will thus contain four unpaired electrons.

Quarks make up protons and neutrons, but not electrons. We believe that quarks and electrons are basic particles that are not composed of lesser subatomic particles.

Thus, option 2 is correct.

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Atomic number of iron = 26
Number of protons in the neucleus = 26
Number of electrons in a neutral Fe atom = 26
Number of electrons in Fe2+ ion = 26 - 2 = 24

Which two atomic particles make up the nucleus of an atom?isotopes
protons
neutrons
electrons

Answers

Neutrons And protons I believe

To show the electron configuration for an atom, what is the advantage of using an orbital notation compared to a dot structure?

Answers

The advantage of using an orbital notation is that it shows the electron distribution in shells.

Dot structures only show the valence electrons of an atom which are the electrons found at the outermost shell. The orbital notation gives a more detailed depiction of the electrons in each shell. This is most advantageous for atoms that have special cases.

Some examples of atoms that have special electronic configurations are copper and chromium. For example, copper is more stable when the 3d subshell is completely filled. This leaves the 4s subshell with only 1 electron. Chromium is also more stable when its s and d subshells are only half full. The orbital notation depicts these special cases, whereas the dot structure does not.

Answer:

2. Orbital notation shows the spin of the electrons.

Explanation:

If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law

Answers

the ideal gas law equation is as follows

PV = nRT

where P - pressure

V - volume

n - number of moles

R - universal gas constant

T - temperature

so if the pressure, volume and temperature are already known

we are left with n and R

since R is the universal gas constant that has a known fixed value then R too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

A.) the molar amount of gas

Hope it helps!

The volume of a gas decreases from 15.7 m3 to 11.2 m3 while the pressure changes from 1.12 atm to 1.67 atm. If the initial temperature is 245 K, what is the final temperature of the gas

Answers

The final temperature of the gas is 260.01 K.

The final temperature can be calculated by using the equation as follows:-

$(P_(1)V_(1) )/(T_(1)) =(P_(2)V_(2) )/(T_(2))$ ........(1)

Here, $P_1$ and $P_2$ is the pressure of this gas before and after the changes.

$V_1$ and $V_2$ is volume of this gas before and after the changes.

$T_1$ and $T_2$ is the temperature (in degrees Kelvins) of this gas before and after the changes.

Given values:-

$P_1=1.12\ atm, P_2=1.67\ atm\n\nV_1=15.7\ m^(3) , V_2=11.2\ m^(3)\n\nT_1=245\ K.T_2=?$

Substitute all the values in the equation (1) as follows:-

$(1.12\ atm*15.7\ m^(3))/(245\ K ) =(1.67\ atm*11.2\ m^(3))/(T_2 )\nT_2=(1.67\ atm*11.2\ m^(3)*245\K)/(1.12\ atm*15.7\ m^(3) )\n=260.60\ K$

Hence, the final temperature of the gas is 260.60 K.

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Explanation:

The data is given as follows.

$P_(1)$ = 1.12 atm, $P_(2)$ = 1.67 atm

$V_(1) = 15.7 m^(3)$ , $V_(2) = 11.2 m^(3)$

$T_(1) = 245 K$ , $T_(2)$ = ?

Therefore, calculate the final temperature using the relation as follows.

$(P_(1)V_(1))/(T_(1))$ = $(P_(2)V_(2))/(T_(2))$

$(1.12 atm * 15.7 m^(3))/(245)$ = $(1.67 atm * 11.2 m^(3))/(T_(2))$

$T_(2) = (1.67 atm * 11.2 m^(3) * 245 K)/(1.12 atm * 15.7 m^(3))$

= $(4582.48 K)/(17.584)$

= 260.605 K

= 260.61 K (approx)

Thus, we can conclude that final temperature is 260.61 K.

In the following combustion reaction of acetylene (C2H2), how many liters of CO2 will be produced if 60 liters of O2 is used, given that both gases are at STP?2C2H2+5O2 2H2O+4CO2

The volume of one mole of gas at STP is 22.4 liters.

Answers

The stoichiometry of the reaction is 5 mols of O2 produces 4 mols of CO2.

1 mol at STP is equivalent to 22.4 liters.

So, 5*22.4 liters of O2 produces 4*22.44 liters of CO2

Then 60 liters of O2 produces 60*4/5 = 48 liters of CO2

Final answer:

In the combustion reaction of acetylene (C2H2), 60 liters of CO2 will be produced if 60 liters of O2 is used.

Explanation:

To determine the volume of CO2 produced in the combustion reaction of acetylene (C2H2), we need to use stoichiometry. From the balanced equation, we can see that 2 moles of C2H2 produce 4 moles of CO2. The ratio is 2:4 or 1:2. Given that 60 liters of O2 is used, we can assume the same volume of CO2 will be produced since both gases are at STP.

Therefore, the volume of CO2 produced would be 60 liters as well.

Keywords: combustion, volume, acetylene, O2, CO2, STP

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