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
Kruka [31]
3 years ago
7

What is the oxidation number of chromium in dichromate ion, cr2o72-?

Chemistry
1 answer:
castortr0y [4]3 years ago
8 0
Oxidation number is charge of element in compound. Can be neutral, positive or negative.
Oxygen in dichromate has oxidation number -2, becauce there are seven oxygens, net oxidation number of oxygen is -14.
2·x(oxidation number of Cr) + 7· (-2) = -2   2x= +12
x= +6, oxidation number of one chromium is +6.
You might be interested in
How do you find the number of valence electrons
Ganezh [65]

Answer:LULULLUL

Explanation:

6 0
3 years ago
Read 2 more answers
Use the given half reactions to "construct" an electrolytic cell. Zn^2+ + 2 e^--------->Zn E°cell = -0.76 V Cu^2+ + 2 e^-----
Neko [114]

Answer:

See explanation and image attached

Explanation:

The standard cell potential at 298 K is given by;

E°cathode - E°anode

Hence;

E°cell = 0.34 V - (-0.76 V)

E°cell = 0.34 V + 0.76 V

E°cell = 1.1 V

To reduce Zn^2+ to Zn then Zn must be the cathode, hence;

E°cell = (-0.76 V) - 0.34 V

E°cell = -1.1 V

5 0
3 years ago
Iodine is a solid nonmetal. What is one property of iodine?
KiRa [710]

Answer:

The correct answer is B. Dull appearance

Explanation:

6 0
3 years ago
Rank the following by their miscibility in
tatuchka [14]

Answer:

<h2>2. H2O < CH3OH < CH3CH2OH < C9H20</h2>

Explanation:

Decane is a hydrocarbon so it is a non-polar molecule. Non-polar molecules are soluble in non-polar molecules and polar molecules are soluble in polar molecules. Water is a polar molecule so it is least soluble in decane molecule and C_{9}H_{20} is a non-polar molecule so it is most soluble in decane molecule. Methanol and ethanol are the derivatives of hydrocarbon so they have more solubility than water but less solubility than nonane molecules.

6 0
3 years ago
Which statement best describes the way a catalyst works?
bogdanovich [222]

Answer: E. It decreases the value of Eact.

Explanation:

Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products.

A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and more molecules convert to products.

The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.

6 0
3 years ago
Other questions:
  • How are temperature and heat related
    6·1 answer
  • A buffer solution contains 0.240 M ammonium chloride and 0.499 M ammonia. If 0.0565 moles of perchloric acid are added to 250 mL
    10·1 answer
  • Help;;;;;;;;;;;;;;;;;)
    6·2 answers
  • If a student wanted to find a diagram of the human reproductive system in his/her science textbook, which part of the book shoul
    12·2 answers
  • An atom of gold is made up of fewer protons than an atom of oxygen? True or False?
    10·2 answers
  • A 1.0mol sample of which of the following compounds has the greatest mass?
    9·1 answer
  • Is is true or false that ocean currents affect the climate I certain regions on earth​
    7·2 answers
  • Purification of chromium can be achieved by electrorefining chromium from an impure chromium anode onto a pure chromium cathode
    14·1 answer
  • What is the total volume of gaseous products formed when 116 liters of butane (C4H10) react completely according to the followin
    9·1 answer
  • Which functional group contains a nitrogen atom and an oxygen atom?
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!