All categories

3 years ago

Match each element to the number of electrons in its valence shell

Chemistry

1 answer:

blondinia [14]3 years ago

6 0

Answer: Be= 2, C =4, Li = 1 and B=3

Explanation:

The valence shell can be define as the outermost shell of an atom that contains the valence electrons.

Beryllium (Be), electronic configuration; 1s2 2s2, = 2 electrons in its valence shell.

Carbon (C), electronic configuration; 1s2 2s2 2p2, = 4 electrons in its valence shell.

Lithium (Li), electronic configuration; 1s2 2s1 = 1 electron in its valence shell.

Boron (B) , electronic configuration; 1s2 2s2 2p1 = 3 electron in its valence shell.

You might be interested in

Nitric oxide is made from the oxidation of ammonia. What mass of nitric oxide can be made from the reaction of 8.00 g NH 3 with

kvv77 [185]

<u>Answer:</u> The mass of nitric oxide is 12.72 grams

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

<u>For ammonia:</u>

Given mass of ammonia = 8.00 g

Molar mass of ammonia = 17 g/mol

Putting values in equation 1, we get:

$\text{Moles of ammonia}=\frac{8.00g}{17g/mol}=0.47mol$

<u>For oxygen gas:</u>

Given mass of oxygen gas = 17.0 g

Molar mass of oxygen gas = 32 g/mol

Putting values in equation 1, we get:

$\text{Moles of oxygen gas}=\frac{17g}{32g/mol}=0.53mol$

The given chemical reaction follows:

$4NH_3(g)+5O_2(g)\rightarrow 4NO(g)+6H_2O(g)$

By Stoichiometry of the reaction:

5 moles of oxygen gas reacts with 4 moles of ammonia

So, 0.53 moles of oxygen gas will react with = $\frac{4}{5}\times 0.53=0.424mol$ of ammonia

As, given amount of ammonia is more than the required amount. So, it is considered as an excess reagent.

Thus, oxygen gas is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

5 moles of oxygen gas produces 4 moles of NO

So, 0.53 moles of oxygen gas will produce = $\frac{4}{5}\times 0.53=0.424moles$ of NO

Now, calculating the mass of NO from equation 1, we get:

Molar mass of NO = 30 g/mol

Moles of NO = 0.424 moles

Putting values in equation 1, we get:

$0.424mol=\frac{\text{Mass of NO}}{30g/mol}\\\\\text{Mass of NO}=(0.424mol\times 30g/mol)=12.72g$

Hence, the mass of nitric oxide is 12.72 grams

6 0

4 years ago

Write 0.006 in exponential form

Solnce55 [7]

$\huge\pink{Answer}$

0.0006 in scientific notation is 6 × 10-4

<h2>Step by step Explanation:</h2>

All numbers in scientific notation or standard form are written in the form

m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.

To convert 0.0006 into scientific notation, follow these steps:

Move the decimal 4 times to right in the number so that the resulting number, m = 6, is greater than or equal to 1 but less than 10

Since we moved the decimal to the right the exponent n is negative

n = -4

Write in the scientific notation form m × 10n

= 6 × 10-4

Therefore,

6 × 10-4 is the scientific notation form of 0.0006 number and 6e-4 is the scientific e-notation form for 0.0006

<h2>HOPE IT HELPS ☺️</h2>

7 0

4 years ago

2. Solid ferric oxide reacts with carbon monoxide gas to produce solid iron and carbon

ArbitrLikvidat [17]

Answer

Fe2O3+3CO→2Fe+3CO2.

Explanation:

6 0

3 years ago

The subatomic particles found in the nucleus are

sattari [20]

C.) protons , the nucleus contains 2 subatomic particles , one protons & neutrons ( protons have a + charge & neutrons have no electrical charge

4 0

3 years ago

Read 2 more answers

Which of the following does not change the rate of collisions between particles in a reaction?

Naddik [55]

Answer: C

Explanation: trust me bro

4 0

3 years ago