Which of the following can be achieved by using a visible-light spectrophotometer?I.

Which of the following can be achieved by using a visible-light spectrophotometer?
I. Detecting the presence of isolated double bonds.
II. Finding the concentration of a KMnO₄ solution.
III. Running a flame test to determine if Na+ or K+ is in a solution.
(A ) III only
(B ) II only
(C) I only
(D) II and III
(E ) I and II

2 months ago

Solution 1

Guest Guest #9847797
2 months ago
1 and 2 i think this is the answer 
thnx u 

📚 Related Questions

Element X is found in two forms: 90.0% is an isotope that has a mass of 20.0, and 10.0% is an isotope that has a mass of 22.0. What is the atomic mass of element X?
A. 20.0
B. 20.2
C. 20.8
D. 21.2
E. 21.8
Can anyone explain this one for me?
Solution 1
[tex]M_{X} = \frac{(20.0\cdot 90\%)+(22.0\cdot10\%)}{100\%} = \frac{2020}{100} = 20.2[u][/tex]

answer: B
Solution 2

The relative atomic mass of element X which has 2 isotopes  is 20.2 u.

What is relative atomic mass ?

Relative atomic mass of an element is an average of masses of atoms of isotopes. It is found out by the formula ,

relative atomic mass=(mass×abundance of isotope 1 )+(mass×abundance of isotope 2)/100

Considering the example given ,atomic mass of element X is found out as,

relative atomic mass=(20×90)+(10×22)/100=2020/100=20.2 u.

Relative atomic mass is a dimensionless physical quantity  which is an average  ratio of mass of atoms in a sample to the atomic mass constant.Atomic mass constant is 1/12 of mass of carbon-12 atom.

Average atomic mass is relative atomic mass  which is calculated from percent composition.Relative atomic mass is unit less and is a physical quantity.It is a multiple of standard atomic mass unit.

Learn more about relative atomic mass,here:



What is the weight of a toy car that has a mass of 0.28 kg?
Solution 1
2.744 Newtons, or 0.62 lbf (pounds force)
What does a red shift indicate about a galaxy?
A. It is moving toward Earth.
B. It is moving very fast.
C. It is slowing down.
D. It is moving away from Earth.
Solution 1
The only cause we know of that could shift the spectrum of a source toward longer wavelengths isthe source moving away from us. That's how we interpret the red shift when we see it, and that's where the whole idea of the expanding universe comes from. But ... just like gravity and the Earth going around the sun ... it can't be proved, so it's "only a theory".
Solution 2
When a red shift happens that means a galaxy is moving away from us.
Therefore the answer is D.
Hoped I helped:D
How many times more basic is a solution with a pH of 10 than a solution with a pH of 8 
a. A pH of 10 is two times as basic 
b. A pH of 8 is two times as basic 
c. A pH of 10 is 2,000 times as basic 
d. A pH of 8 is 20 times as basic 
e. A pH of 10 is 100 times as basic
Solution 1
you may want to ask the questions seperatly more likely for someone to answer
The combination of units written kg·m/s2 can be used for which of the following?
A. acceleration
B. mass
C. force
D. weight
Solution 1
C. force because the force able to communicate to a mass of one kilogram an accerelation of 1m/s²
F= -------------
Solution 2

The combination of units written kg· [tex]m/s^{2}[/tex]can be used for force.

What is force?

A force is just a factor that can impact an object's motion. A force may cause a mass item to accelerate by changing its velocity. A push as well as a pull can also be used to describe forces. A force is a vector quantity even though it has both magnitude , direction as well. It can be denoted by the symbol F.

The formula of force (F) = m×a.

where, m is mass of the particle and a is acceleration. It is known that unit of mass is kg and acceleration is [tex]m/s^{2}[/tex].

Now, put the unit of given data in above formula.

F= kg×[tex]m/s^{2}[/tex].

To know more about the force click here.



What is an ion?
in chemistry
Solution 1
an atom with a charge
Solution 2
an ion is a atom that is charged.
A car accelerates from 15 m/s to 25 m/s in 15 s. What is the car's acceleration?
Solution 1
Acceleration = (change in speed) / (time for the change)

Change in speed = (25 - 15) = 10 m/s
Time = 15 s

Acceleration = 10/15 = 2/3 m/s
Which of these follows a cyclical pattern?
A. sunspot maxima and minima
B. condensation of a nebula
C. formation of a crater
D. formation of a black hole
Solution 1
The number of sunspots, observed during the past 300 years or so,
has been found to vary up and down in a cycle of very very roughly 
about 11 years.
Please help. What mass of copper is required to replace silver from 4.00g of silver nitrate dissolved in water? I found the molar mass of all of them but don't know where to go from there
Solution 1

It's importaint to first set up the equation. 2AgNO3+Cu--->Cu(NO3)2+2Ag this will dtermine whether you need to divide by two when you divide the moler mass of silver nitrate with 4g to find the amout of moles.023547419, then you divide by two and multiply by the molor mass of CU(NO3)2 and you should get your answer. I got 2.208grams. (please tell me if i'm wrong, going to be an AP Chemistry student.), i copyed myself so don't ban me.
Solution 2


0.7479 grams of copper is required to replace 4.00 grams of silver nitrate.


[tex]Cu+2AgNO_3\rightarrow Cu(NO_3)_2+2Ag[/tex]

Moles of silver nitrate = [tex]\frac{4.00 g}{169.87 g/mol}=0.0235 mol[/tex]

According to reaction 2 moles of silver nitrate reacts with 1 mole of copper metal.

Then 0.02354 moles of silver nitrate will react with:

[tex]\frac{1}{2}\times 0.0235 mol=0.01177 mol[/tex]

Mass of 0.01177 moles copper =0.01177 mol × 63.55 g/mol = 0.7479 g

0.7479 grams of copper is required to replace 4.00 grams of silver nitrate.

What is the acceleration of a 9.6-kg rock if gravity pulls it downward, but air resistance pushes upward with a force of 2.8 N?
Solution 1
OK, so the downward force on the rock is mg (force of g) - 2.8N (force in opposite direction). since mg (9.6 kg*9.8 m/s^2)= 94.08 N, then mg-2.8= 91.28 N. That is your net force on the rock (or total force). And, since f=ma, a= f/m.
so, a= 91.28 N / 9.6 kg = 9.5 m/s^2.(final answer)