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3 years ago

In which of the following types of reactions are electrons gained?

Chemistry

2 answers:

melomori [17]3 years ago

6 0

1) It must be oxidized
2) reduction
3) Sodium
4) Hydrogen

amid [387]3 years ago

6 0

Answer: The correct answer for 1 is Option 4 and for 2 is Option 1.

Explanation:

For 1:

From the given options:

Decomposition reaction is defined as the reaction in which a compound breaks down into two or more smaller compounds.

Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance is increased.

Neutralization reaction is defined as the reaction in which an acid reacts with a base to produce a salt and water molecule.

Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.

From the above information, the correct answer is Option 4.

For 2:

Reducing agent is defined as the agent which reduces the other substance and itself gets oxidized. It undergoes oxidation reaction.

Oxidizing agent is defined as the agent which oxidizes the other substance and itself gets reduced. It undergoes reduction reaction.

The reaction of sodium and oxygen follows the equation:

$4Na(s)+O_2(g)\rightarrow 2Na_2O(s)$

On reactant side:

Oxidation state of sodium = 0

Oxidation state of oxygen = 0

On product side:

Oxidation state of sodium = +1

Oxidation state of oxygen = -2

As, the oxidation state of sodium is increasing from 0 to +1, it is undergoing an oxidation reaction and thus is a reducing agent. While the oxidation state of oxygen is reducing from 0 to -2, it is undergoing an reduction reaction and thus is a oxidizing agent.

Hence, the correct answer is Option 1.

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29. What is E for a system which has the following two steps:

jasenka [17]

Answer:

Zero

Explanation:

Recall that;

E = q + w

Where;

q = heat, w = work done

When heat is absorbed by the system q is positive

When heat is evolved by the system q is negative

When the system does work, w is negative

When work is done on the system w is positive

Step 1

ΔE1= 60 KJ + 40 KJ = 100KJ

Step 2

ΔE2= (-30 KJ) + (-70 KJ) = (-100) KJ

ΔE1 + ΔE2= 100KJ + (-100) KJ = 0KJ

4 0

3 years ago

24-Complete the following sentence:

docker41 [41]

Answer:

B. Solvent

Explanation:

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8 0

2 years ago

The combustion of palmitic acid is represented by the chemical equation: C16H32O2(s) + 23O2(g) → 16 CO2(g) + 16 H2O(l) The magni

solniwko [45]

Answer:

The correct option is C

Explanation:

From the question we are told that

The reaction is

$C_{16}H_{32}O_2(g) + 23O_2(g) \to 16 CO_2(g) + 16 H_2O(l)$

Generally $\Delta H = \Delta U + \Delta N* RT$

Here $\Delta H$ is the change in enthalpy

$\Delta U$ is the change in the internal energy

$\Delta N$ is the difference between that number of moles of product and the number of moles of reactant

Looking at the reaction we can discover that the elements that was consumed and the element that was formed is $O_2$ and $CO_2$ and this are both gases so the change would occur in the number of moles