1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lisabon 2012 [21]
3 years ago
13

Which of the following statements is true?

Chemistry
1 answer:
tiny-mole [99]3 years ago
8 0
Statement A is true
You might be interested in
The top of the plate where food is placed is called:
Murrr4er [49]

Answer:

Design Shape

Explanation:

3 0
2 years ago
What number is considered neutral? (On the pH scale)
VMariaS [17]
7 is neutral on the pH scale
4 0
3 years ago
purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode
stiv31 [10]

The chromium in the electrolytic solution is present as cr³⁺ will take 6.19 hours  will it take to plate 18.0 kg of chromium onto the cathode if the current passed through the cell is held constant at 45.0 A.

It is given that mass is 18 kg. Converting mass into grams

18 x (1000g / 1 kg)

= 18000 g

So, 18 kg = 18000 g

Now, calculate the number of moles

No. of moles = mass of Cr / molecular mass of Cr

No. of moles = 18000 / 52 g/mole

No. of moles = 346.15 mole

For , Cr³⁺, 3 moles of electrons are required

Hence,

3 x 346.15 mole

1038.45

As 96500 C of charge are present in 1 mole of electrons. As a result, the charge held by 1038.45 mole of electrons will be determined as follows.

= 1038.45mol x  96500 C / mole

= 10.02 x 10⁷ C

As, we know that relation between charge, current and time is as follows.

Q = I x T

Current is given as 45 A

Therefore, charge is calculated  

T = Q / I

T = 100.21 x 10⁶ / 45

T = 2.227 x 10⁶

As there are 3600 seconds in one 1 hour. Converting 2.227 x 10⁶ into hours are

= 2.227 x 10⁶ / 3600 sec/h

= 6.19 hours

Thus, if the current flowing through the cell is maintained constant at 45 A, we may estimate that it will take 6.19 hours to plate 18 kg of chromium onto the cathode.

To know more about  electrolytic solution visit :

brainly.com/question/9203208

#SPJ4

4 0
1 year ago
Which of the following is an example of physical change
BartSMP [9]
A physical change is like freezing water and it turns into Ice.
8 0
3 years ago
Read 2 more answers
Can someone help me out please ? I am very stuck here
Alex17521 [72]
Hey there!

<span>Atomic Masses :
</span>
H = <span>1.00794  a.m.u
N = </span><span>14.0067  a.m.u
O = </span><span>15.9994  a.m.u

Therefore:

HNO3 = </span>1.00794 + 14.0067 + ( 15.9994 * 3 ) =>  <span>63.0128 g/mol</span>
7 0
3 years ago
Other questions:
  • What is the name of the branch of science that specifically studies the conversion of chemical energy to electrical energy and v
    9·2 answers
  • 4/5(2x 5)−4=1
    6·1 answer
  • Which structure could a scientist look for in a plant that would identify it as a club moss rather than a liverwort?
    10·2 answers
  • The activation energy of an endothermic reaction _____.
    14·2 answers
  • What are the correct answers to these questions?
    15·1 answer
  • What property is both physical and extensive?
    9·1 answer
  • In this lab, you will use the flame test to identify the metal ion in two boxes of unidentified fireworks. Write an investigativ
    7·2 answers
  • Electrons are transferred from atoms of to atoms of . This transfer makes the sodium atoms and the phosphorus atoms . As a resul
    10·1 answer
  • A certain signal produces 2.56x10^9 waves per hour (2560000000 waves/h). What is the frequency of this signal in Hertz?
    6·1 answer
  • Carson’s class visited a hydroelectric plant on a field trip during their study of energy. The process interested him, and he ha
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!