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MAXImum [283]
3 years ago
12

Explain with example, why there cannot be an oxidation reaction without a corresponding reduction reaction

Chemistry
2 answers:
Vlada [557]3 years ago
8 0
Because matter cannot be created or destroyed
timurjin [86]3 years ago
4 0

Answer:

see explanation

Explanation:

By definition, 'oxidation' is the loss of electrons from an element during a reaction process. The phrase 'loss of electrons' is a misnomer in that the electrons are actually not 'lost' but transferred to another element willing to gain the electrons. The process of gaining electrons is by definition 'reduction'.

A reaction that is an Oxidation-Reduction Reaction is basically two 'half-reactions'; one being the oxidation half reaction and the other the reduction half reaction. For example, consider an aqueous reaction of Copper(II) Sulfate with Zinc solid in the following reaction scheme.

Zn(s) + CuSO₄(aq) => ZnSO₄(aq) + Cu(s)

In this reaction Zinc undergoes oxidation losing (transferring) 2 electrons to Copper(II) ion gaining the 2 electrons in a reduction process. This can be represented by showing two half-reactions; one for oxidation and one for reduction as follows:

Zn(s) => Zn⁺²(aq) + 2e⁻  => Oxidation shows electrons on right of arrow.

Cu⁺²(aq) + 2e⁻ => Cu(s) => Reduction shows electrons on left of arrow.

When these two reactions are added together, the electron numbers should cancel leaving the net oxidation reduction reaction ...

Zn(s) + Cu⁺²(aq) => Zn⁺²(aq) + Cu(s)

The SO₄²⁻(aq) ion is a spectator ion and does not undergo reaction. It is there only as a 'required' counter-ion for the elements that do undergo oxidation-reduction.

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A sample of nitrogen gas, (N2), occupies 45.0 mL at 27.00∘C and 80.0 kPa. What will be the pressure if the gas is cooled to −73.
maxonik [38]

Answer:

The new pressure is 53.3 kPa

Explanation:

This problem can be solved by this law. when the volume remains constant, pressure changes directly proportional as the Aboslute T° is modified.

T° increase → Pressure increase

T° decrease → Pressure decrease

In this case, temperature was really decreased. So the pressure must be lower.

P₁ / T₁ = P₂ / T₂

80 kPa / 300K =  P₂/200K

(80 kPa / 300K) . 200 K = P₂ →  53.3 kPa

6 0
3 years ago
One quarter of a 1-mole piece of iron turns to rust in six months. Which rate describes the speed at which the iron rusts?
avanturin [10]
1/4 mol = 0.25 mol

6 months = 0.5 year

rate = 0,25 mol / 0.5 year = 0.5 mol/year or approx 0.042 mol/month
7 0
3 years ago
Read 2 more answers
The Pauli Exclusion Principle tells us that no two electrons in an atom can have the same four quantum numbers.
Anuta_ua [19.1K]

Answer:

See explanation

Explanation:

We can describe electrons using four sets of quantum numbers;

principal quantum number (n)

orbital quantum number (l)

magnetic quantum number (ml)

spin quantum number (ms)

Since no two electrons in an atom can have the same value for all four quantum numbers according to Pauli exclusion theory, for the orbitals given one possible value for each quantum number is shown below;

For 1s-

n = 1, l= 0, ml = 0, ms= 1/2

For 2s-

n= 2, l =0, ml=0, ms=1/2

For 1s and 2s orbitals, there is only one possible value for ml which is zero.

3 0
2 years ago
What is the mass, in grams, of one mole of any substance known as?
Mashutka [201]

The answer is B. the molar mass.

The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles.

4 0
2 years ago
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____ is converted to carbohydrate by plants during photosynthesis.
Ratling [72]
Carbon dioxide 
Have a great day:)
5 0
3 years ago
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