Iron Yellow: FeSO4 (aq)+ K2C2O4 (aq)The product is also known as the mineralHumboldtine.Names: and Colors: and Species Initially Present:Evidence of Reaction: Name and Balanced Net Ionic Equation for Precipitation:

Answers

Answer 1

Answer:

FeSO₄ + 2K₂C₂O₄ → K₂[Fe(C₂O₄)₂] + K₂SO₄

Iron(II) sulfide react with potassium oxalate to produce potassium dioxalatoferrate(II) and potassium sulfate.

The mineral Humboldtine has the formula Fe²⁺(C₂O₄). 2H₂O

The color of the mineral is yellow to amber yellow.

It is a rare authigenic organic mineral occuring on fracture surfaces in coal deposits and rarely in granitic pegmatites and hydrothermal mineral deposits.

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Which si unit would be most appropriate for describing the lengeth of the shoe?

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LOLOLOKIKIKHAbshzjbd d she zjeks e
Doeowknsnd cjxjznnzns sm

What is the answer? Please

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Answer:

To instill a high degree of personal honor, self-reliance, and confidence in each cadet by presenting a military environment in which cadets will be forced to rely upon themselves and their shipmates to study, work, and learn.

Please ignore my answers because they are wrong.

Answers

Answer:

The wavelength of the radio wave is 3.003 m.

The energy of the radio wave is $6.6194* 10^(-26) J$ .

Explanation:

Frequency of the radio waves, ν = 99.9 MHz = $99.9* 10^6 Hz$

Wavelength and frequency are related to each other by realtion:

$\lambda =(c)/(\nu )$

$\lambda$ = Wavelength of the wave

c = speed of the light

ν = Frequency of the wave

$\lambda =(3* 10^8 m/s)/(99.9* 10^6 s^(-1))=3.003 m$

The wavelength of the radio wave is 3.003 m.

The energy of the electromagnetic wave is given by Planck's equation:

$E=h* \nu$

h = Planck's constant = $6.626* 10^(-34) Js$

The energy of the radio wave with 99.9 MHz frequency will be:

$E=6.626* 10^(-34) Js* 99.9* 10^6 s^(-1)$

$E = 6.6194* 10^(-26) J$

The energy of the radio wave is $6.6194* 10^(-26) J$ .

The following reaction was monitored as a function of time: A→B+C A plot of ln[A] versus time yields a straight line with slope −4.3×10−3 /s. If the initial concentration of A is 0.260 M, what is the concentration after 225 s?

Answers

The concentration after 225 s is 0.099 M.

As we know that, the graph of ln [A] versus time yields a straight line with slope 'k'.

So, Slope = k = $4.3*10^(-3)/s$

Rate law for first order kinetics:

$t=(2.303)/(k) log (a)/(a-x)$

where,

k = rate constant = $4.3*10^(-3)/s$

t = time passed by the sample = 225 s

a = initial amount of the reactant = 0.260 M

a - x = amount left after decay process = ?

On substituting the values:

$t=(2.303)/(k) log (a)/(a-x)\n\nt=(2.303)/(4.3*10^(-3)) log (0.260)/(a-x)\n\na-x=0.099M$

Therefore, the concentration after 225 s is 0.099 M.

Find more information about Rate law here:

brainly.com/question/7694417

Answer : The concentration after 225 s is, 0.099 M

Explanation :

As we know that, the graph of ln [A] versus time yields a straight line with slope 'k'.

So, Slope = k = $4.3* 10^(-3)s^(-1)$

Expression for rate law for first order kinetics is given by:

$t=(2.303)/(k)\log(a)/(a-x)$

where,

k = rate constant = $4.3* 10^(-3)s^(-1)$

t = time passed by the sample = 225 s

a = initial amount of the reactant = 0.260 M

a - x = amount left after decay process = ?

Now put all the given values in above equation, we get

$225=(2.303)/(4.3* 10^(-3))\log(0.260)/(a-x)$

$a-x=0.099M$

Therefore, the concentration after 225 s is, 0.099 M

What makes physical change a physical change and a chemical change a chemical change

Answers

A physical change is any change in a substances form that does not change its chemical makeup. Examples of physical changes are breaking a stick or melting ice. A chemical change occurs when atoms of a substance are rearranged, and the bonds between the atoms are broken or formed. HOPE THIS HELPS!!

Answer:

A physical change is reversible and the changes made are only physical (smell, physical state, volume, etc) and most importantly no new substance is formed. In a chemical change, a new substance is formed, the chemical properties are changed, and it's permanent.

The periodic table displaysOA. all of the known elements that exist in the world today.
OB. only the important elements that exist in the world.
OC. only the important compounds that exist in the world.

Answers

OA. all the known elements that exist in the world today.

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