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4 years ago

In an atom, the first energy level can hold

Chemistry

1 answer:

Pepsi [2]4 years ago

3 0

Answer:

2, 8, 18

Explanation:

The number of orbitals for any level of interest n is calculated by a formula $o = n^2$ . Since each orbital contains a maximum of 2 electrons, we can calculate the total number of electrons in an nth orbital by $e = 2n^2$ .

As a result, the first energy level for n = 1 can hold a maximum of $2n_1^2 = 2\cdot 1^2 = 2$ electrons,
The second energy level can hold a maximum of $2n_2^2 = 2\cdot 2^2 = 8$ electrons,
The third energy level can hold a maximum of $2n_3^2 = 2\cdot 3^2 = 18$ electrons.

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Which example involves phase change in which heat energy is released by the substance?

Komok [63]

Answer:

Example that involves phase change in which heat energy is released by substance:

Explanation:

If heat is removed from a substance, such as in freezing and condensation, then the process is exothermic. In this instance, heat is decreasing the speed of the molecules causing them move slower (examples: liquid to solid; gas to liquid). These changes release heat to the surroundings.3 days ago

Solid → Liquid: Melting or fusion

Gas → Liquid: Condensation

Liquid → Gas: Vaporization

Liquid → Solid: Freezing

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2 years ago

Balance the following skeleton reaction and identify the oxidizing and reducing agents: Include the states of all reactants and

rusak2 [61]

Answer:

$4Zn_(_s_)~+~7OH^-~_(_a_q_)~+~NO_3^-_(_a_q_)~+~6H_2O_(_l_)~-->4Zn(OH)_4^-^2_(_a_q_)~+~NH_3_(_g_)$

-) Oxidizing agent: $NO_3^-_(_a_q_)$

-) Reducing agent: $Zn_(_s_)$

Explanation:

The first step is separate the reaction into the semireactions:

A. $Zn~->Zn(OH)_4^-^2$

B. $NO_3^-~->~NH_3$

If we want to balance in basic medium we have to follow the rules:

1. We adjust the oxygen with $OH^-$

2. We adjust the H with $H_2O$

3. We adjust the charge with $e^-$

Lets balance the first semireaction A. :

$Zn~+~4OH^-~->Zn(OH)_4^-^2~+~2e^-$

Now, lets balance semireaction B:

$NO_3^-~+~8e^-~+~6H_2O~->~NH_3~+~9OH^-$

Finally, we have to add the two semireactions:

_________________________________________

$8~(Zn~+~4OH^-~->Zn(OH)_4^-^2~+~2e^-)$

$2~(NO_3^-~+~8e^-~+~6H_2O~->~NH_3~+~9OH^-)$

_________________________________________

$(8Zn~+~32OH^-~->8Zn(OH)_4^-^2~+~16e^-)$

$(2NO_3^-~+~16e^-~+~12H_2O~->~2NH_3~+~18OH^-)$

Cancel out the species on both sides:

$8Zn~+~14OH^-~+~2NO_3^-~+~12H_2O~-->8Zn(OH)_4^-^2~+~2NH_3$

Simplifying the equation :

$4Zn~+~7OH^-~+~NO_3^-~+~6H_2O~-->4Zn(OH)_4^-^2~+~NH_3$

The $Zn_(_s_)$ is oxidized therefefore is the reducing agent. The $NO_3^-_(_a_q_)$ is reduced therefore is the oxidizing agent.

4 0

4 years ago

Italian salad dressing is an example of a __________________.

Romashka [77]

The answer is E.solution. I hope it helps. Please Brainly Me! It is the thing with the crown next to the stars.

5 0

4 years ago

what is the trend for the size as you go from Be to Mg to Ca? does the atomic size increase, decrease, or remain the same? how w

lys-0071 [83]

Answer:

the size of Ca is the greatest ,then Mg is the greater on size than Be

Explanation:

if you make the electron configuration for each of the elements, what is the main difference u gonna see ?

Be 4 1s2/2s2

Mg 12 1s2 /2s2 2p6/3s2

Ca 20 1s2 /2s2 2p6/3s2 3p6 3d/4s2

see that all the elements are in the same group but are in different period

u gonna see the last electron valance shell in Ca are too far from its nucleus but in Be the last electrons are too close and more attracted to the atom's nucleus , so the size of Ca is the biggest then Mg then Be

4 0

4 years ago

What electrons in an atom take part in chemical bonding, and what are they called

nignag [31]

Explanation:

The electrons in the outermost electron shell are responsible for forming chemical bonds. These electrons are also known as valence electrons

4 0

3 years ago