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
Iteru [2.4K]
3 years ago
9

Which equation represents the oxidation half-reaction for this redox reaction?

Chemistry
1 answer:
Ronch [10]3 years ago
6 0

Answer:

C.   Mg → Mg²⁺ + 2e−

Explanation:

The oxidation reduction reactions are called redox reaction. These reactions are take place by gaining or losing the electrons and oxidation state of elements are changed.

Oxidation:

Oxidation involve the removal of electrons and oxidation state of atom of an element is increased.

Reduction:

Reduction involve the gain of electron and oxidation number is decreased.

Consider the following reactions.

Mg + CuSO₄      →    MgSO₄  + Cu

Mg atom lose two electron and gets oxidized.

Mg → Mg²⁺ + 2e−

These two electrons are accepted by Cu and gets reduced.

CuSO₄       →      Cu²⁺ + SO₄²⁻

Cu²⁺ + 2e⁻   →  Cu

You might be interested in
How many sodium atoms will create an ionic bond with sulfur?
Galina-37 [17]
Hi,

Two sodium atoms are needed to create an ionic bond with sulfur. 
5 0
3 years ago
Weathering of rock and sedimentation ultimately lead to the formation of___
Inga [223]
Weathering of the rock and sedimentation are decomposition processes. Through time, the minerals in the rocks soften due to pressure and heat. So, they crumble down and reduce in terms of size. Once they do, they become sand or part of the soil. So, the answer is A.
6 0
3 years ago
Read 2 more answers
onsider the following reaction: CaCN2 + 3 H2O → CaCO3 + 2 NH3 105.0 g CaCN2 and 78.0 g H2O are reacted. Assuming 100% efficiency
mestny [16]

Answer : The excess reactant is, H_2O

The leftover amount of excess reagent is, 7.2 grams.

Solution : Given,

Mass of CaCN_2 = 105.0 g

Mass of H_2O = 78.0 g

Molar mass of CaCN_2 = 80.11 g/mole

Molar mass of H_2O = 18 g/mole

Molar mass of CaCO_3 = 100.09 g/mole

First we have to calculate the moles of CaCN_2 and H_2O.

\text{ Moles of }CaCN_2=\frac{\text{ Mass of }CaCN_2}{\text{ Molar mass of }CaCN_2}=\frac{105.0g}{80.11g/mole}=1.31moles

\text{ Moles of }H_2O=\frac{\text{ Mass of }H_2O}{\text{ Molar mass of }H_2O}=\frac{78.0g}{18g/mole}=4.33moles

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

CaCN_2+3H_2O\rightarrow CaCO_3+2NH_3

From the balanced reaction we conclude that

As, 1 mole of CaCN_2 react with 3 mole of H_2O

So, 1.31 moles of CaCN_2 react with 1.31\times 3=3.93 moles of H_2O

From this we conclude that, H_2O is an excess reagent because the given moles are greater than the required moles and CaCN_2 is a limiting reagent and it limits the formation of product.

Left moles of excess reactant = 4.33 - 3.93 = 0.4 moles

Now we have to calculate the mass of excess reactant.

\text{ Mass of excess reactant}=\text{ Moles of excess reactant}\times \text{ Molar mass of excess reactant}(H_2O)

\text{ Mass of excess reactant}=(0.4moles)\times (18g/mole)=7.2g

Thus, the leftover amount of excess reagent is, 7.2 grams.

8 0
3 years ago
When a new bond forms in a chemical reaction, what happens?
Kisachek [45]
The answer to this question would be A. Energy is released. 

When a chemical bond is a form, the bond will either suck up energy or produce energy. So, to be precise the energy is not always released but also can be absorbed. In this case, the energy released number will be a minus.

Options B and C is definitely wrong since the bond is formed by an electron, it won't affects neutron/proton.
Option D might be true since the product is made of 2 or more atoms then it would seem larger. But the size of the actual atom won't be increased.

8 0
3 years ago
Read 2 more answers
Question 12 (1 point)
Vinvika [58]

Answer:

Option c. Neutral

Explanation:

Only neutral solution gives a green colouration to a pH paper

8 0
3 years ago
Read 2 more answers
Other questions:
  • How do the metal aluminum coils in an air conditioner help keep a house cool
    6·2 answers
  • Given a 1.50 Liters of solution that contains 62.5 grams of magnesium oxide. What is the Molarity of that solution?
    13·1 answer
  • What is the pH of a solution when the [OH - ] = 1 x 10 -3
    5·1 answer
  • Need help real quick with these questions
    10·1 answer
  • Horizontal lines that represent different climate zones are called
    10·1 answer
  • Scientists are studying fertilizers to help grass grow in southern California. Fertilizer is any substance that can be added to
    15·2 answers
  • During an experiment, 104 grams of calcium carbonate reacted with an excess amount of hydrochloric acid. If the percent yield of
    11·1 answer
  • What’s the answer to these 3 questions? thanks!
    13·1 answer
  • Which process of making a stainless steel product does the photograph
    12·2 answers
  • This chart shows descriptions of the atoms for four different substances.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!