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
MAXImum [283]
3 years ago
5

Balance the below half-reaction, which takes place in acidic solution. cr2o72−(aq) → cr3 (aq) how many electrons are transferred

in the balanced half-reaction
Chemistry
1 answer:
daser333 [38]3 years ago
8 0
The equation is as follow,

                                          Cr₂O₇²⁻    →    Cr³⁺

Balance the Cr atoms,
                                          Cr₂O₇²⁻    →    2 Cr³⁺

Identify Oxidation Number of Elements on Both sides,

Left Hand Side;
                          Cr  =  +6
                           O  =  -2
Right Hand Side;
                          Cr  =  +3
                           O  =  -2

Means each Cr is gaining 3 electrons to change into +3 state, Hence, 6 electrons are gained by two Cr atoms, So,

                                       Cr₂O₇²⁻  +  6e⁻    →    2 Cr³⁺

Balance Oxygen atoms, as it is acidic medium, add H⁺ ion on the side containing large number of Oxygen atoms and H₂O on side containing less number of Oxygen atoms, So,

                                 H⁺  +  Cr₂O₇²⁻  +  6e⁻    →    2 Cr³⁺  +  H₂O

Now Balance H and O,

                          14 H⁺  +  Cr₂O₇²⁻  +  6e⁻    →    2 Cr³⁺  +  7 H₂O

6 electrons are transferred in this reaction.
You might be interested in
What most likely led to a change in the widely accepted theory of evolution? new experiments involving genes and evolution exper
ss7ja [257]

Incomplete question. Full question reads;

Darwin developed the theory of evolution to explain why there are so many different kinds of living things. He could easily observe that offspring of any animals were slightly different from their parents and that this could allow for big changes over thousands of years. He did not know that genes caused the differences. Genes are now very important in the modern theory of evolution.

What most likely led to a change in the widely accepted theory of evolution?

Answer:

<u>new experiments involving genes and evolution </u>

<u>Explanation:</u>

Indeed, the original theory of evolution has experienced several changes in its acceptance because of its imperfect and wrong assumptions not based on generally acceptable scientific facts,

Hence, new experiments involving genes and evolution has led to a change (disagreements and few agreements) in the widely accepted theory of evolution.

3 0
3 years ago
Read 2 more answers
What is an ionic bond
Pani-rosa [81]
Ionic bonding is the complete transfer of valence electron(s) between atoms. It is a type of chemical bond that generates two oppositely charged ions. In ionic bonds, the metal loses electrons to become a positively charged cation, whereas the nonmetal accepts those electrons to become a negatively charged anion.
7 0
3 years ago
Read 2 more answers
Which two statements describe what happens to the nuclei of atoms during a fusion reaction? O A. Large nuclei break apart into t
pashok25 [27]

Answer:

D. Nuclei with small masses combine to form nuclei with larger masses.

B. A small amount of mass in the nuclei that combine is converted to energy

Explanation:

A nuclear fusion, in contrary to fission, is the process by which the nuclei of two atoms combine to form a much larger atom with a large nuclei. Likewise, during a fusion reaction, a large amount of energy is released from the small amount of mass in the nuclei (two) that combines.

According to this question, the following are true of a fusion reaction:

- Nuclei with small masses combine to form nuclei with larger masses.

- A small amount of mass in the nuclei that combine is converted to enormous energy.

3 0
3 years ago
Read 2 more answers
Two glucose molecules can combine to form a disaccharide molecule and what molecule
elena-14-01-66 [18.8K]
And a water molecule, this is called a dehydration synthesis. when 2 molecule combine, a water molecule leave.
5 0
3 years ago
The reducing agent in the reaction described in Fe + 2HCl → FeCl2 + H2 is A. H2. B. Fe. C. HCl. D. FeCl2.
Fed [463]
The reducing agent is b). Fe
7 0
3 years ago
Read 2 more answers
Other questions:
  • In NMR if a chemical shift(δ) is 211.5 ppm from the tetramethylsilane (TMS) standard and the spectrometer frequency is 556 MHz,
    8·1 answer
  • 0.158 g of a mystery molecule is placed into a bomb calorimeter that has a heat capacity of 1650 J/C. After the sample is combus
    10·1 answer
  • The vapor pressure of liquid chloroform, CHCl3, is 100. mm Hg at 283 K. A 0.380 g sample of liquid CHCl3 is placed in a closed,
    7·1 answer
  • Match the following
    11·1 answer
  • What is the highest occupied molecular orbital in the O2 molecule?
    5·1 answer
  • Whats the answer? please help me​
    8·1 answer
  • How can parents and other caregivers help children learn good nutrition in the home?
    10·1 answer
  • Limiting reactants don’t know how to do
    9·1 answer
  • Cambiar dos meses a segundos
    15·1 answer
  • How is carbon within the hydrosphere?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!