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2 years ago

In which reaction are electrons transferred from one reactant to another reactant?

2 answers:

5 0

The answer is (1). The electrons transfer form one reactant to another means that there is the change of valence. For other choices, the valence of reactant does not change.

Lynna [10]2 years ago

5 0

Answer : The correct reaction is, (1) $2Ca(s)+O_2(g)\rightarrow 2CaO(s)$

Explanation :

(1) $2Ca(s)+O_2(g)\rightarrow 2CaO(s)$

In this reaction, the oxidation state of calcium (Ca) changes from (0) to (+2) and the oxidation state of oxygen (O) changes from (0) to (-2). In this reaction the electrons are transferred from one reactant (calcium) to another reactant (oxygen). This is a synthesis reaction.

(2) $AgNO_3(aq)+KCl(aq)\rightarrow AgCl(s)+KNO_3(aq)$

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a double-displacement reaction.

(3) $HCl(aq)+NaOH(aq)\rightarrow NaCl(aq)+H_2O(l)$

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a neutralization reaction.

(4) $H_3O^+(aq)+OH^-(aq)\rightarrow 2H_2O(l)$

In this reaction, there is no changes in the oxidation state of the elements. So, in this reaction, no electrons transferred from one reactant to another reactant. This is a combination reaction.

Hence, the correct reaction is, (1) $2Ca(s)+O_2(g)\rightarrow 2CaO(s)$ in which the electrons transferred from one reactant to another reactant.

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For each of the processes, determine whether the entropy of the system is increasing or decreasing. The system is underlined.

defon

1. Increasing
2. Increasing
3. Decreasing
4. Increasing
5. Decreasing

6 0

3 years ago

How to find how many electrons are in an element

Murljashka [212]

Explanation:

1) Locate the atomic number in the upper left corner of the square. The atomic number will tell you the number of protons

2) In a neutral state, the element will contain the same number of protons as it will electrons.

--> Boron (B) has an atomic number of 5, so it has 5 protons.

--> Having 5 protons (+1 charge each) means to be balanced, it must have 5 electrons (-1 charge each)

However, what if it's not in a neutral state?

If it's not in a neutral state, it will look something like this:

Ca ^ 2+

<em>Btw, the "^" means that it will be written like it's an exponent. That confuses people sometimes.</em>

Anyways, the "2+" means it's an ion with a positive charge of 2. For us to have a positive charge, it means it's lost two electrons (cause electrons are negative, so taking them away means we are left with a more positive charge).

To get the number of remaining electrons, subtract the 2 from the atomic mass. In this case, that would be 20.

20 - 2 = 18 electrons

Another example:

N ^3-

Atomic Number: 7

7 + 3 = 10 electrons.

Why did I add here instead of subtracting? It's cause the 3- means we have added electrons, resulting in the ion having a negative charge. It's got more electrons than usual.

Hopefully this helps a bit.

5 0

2 years ago

Hi um

nydimaria [60]

It’s( A)Condensation

6 0

3 years ago

Read 2 more answers

Determine a detailed mechanism for the chlorination of benzene using cl2 and fecl3.

RUDIKE [14]

Step (1):
Generation of electrophile: by the action of Lewis acid FeCl₃ on Cl₂ to serve as a source of Cl⁺ (Electrophile)
Step (2):
Addition of electrophile to form carbocation:
addition of electrophile to form C-Cl bond and form carbocation which is stabilized by resonance.
Step (3):
Loss of proton to re-form the aromatic ring by the action of FeCl₄⁻ which removes proton from carbon containing Cl and forming the aromatic ring again

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2 years ago

Lewis structure for carbon tetrabromide (CBrÁ), in which a central carbon atom is bound to four atoms of the group 7A element br

nlexa [21]

Remember that carbon has 4 electrons in its valence shell meanwhile bromine has 7

So i think the lewis structure would be :

Br

C Br Br

Br

Hope this helps

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3 years ago