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2 years ago

How many inner shell electrons does beryllium have?

Chemistry

2 answers:

stepladder [879]2 years ago

8 0

Beryllium has two inner shell electrons

olchik [2.2K]2 years ago

5 0

And two 2s electrons in the Be atom. Its electron configuration is thus 1s22s2or[He]2s2 The symbol [He] denotes the inner shell of two 1s electrons which have the same configuration as the noble gas He. The beryllium atom is noticeably smaller than the lithium atom

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Which of the following equations follows the law of conservation of mass?

Dovator [93]

Answer:

option A = C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

Explanation:

Law of conservation of mass:

This law stated that mass can not be created or destroyed in chemical reaction. It just changed from one to another form.

For example:

C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

28 g + 96 g = 88 g + 36 g

124 g = 124 g

This reaction correctly hold the law of conservation of mass.

Other options:

C + 4H₂ → CH₄

12 g + 8g = 16 g

20 g = 16 g

This reaction do not hold the law of conservation of mass.

3H₂O → 3H₂ + 3O₂

54 g = 6 g + 96 g

54 g = 102 g

This reaction do not hold the law of conservation of mass.

2Na + Cl → NaCl

46 g + 35.5 g = 58.5 g

81.5 g = 58.5 g

This reaction do not hold the law of conservation of mass.

6 0

3 years ago

Read 2 more answers

Could you separate the sodium from the chlorine by crushing the salt crystals

Zigmanuir [339]

No, you cannot.

The distinction is made in the fact that the sodium and chlorine atoms are bonded chemically, while the crushing of the salt is a physical change. A physical change is one that does not have the ability to change the identity of the substance. Such changes include crushing, boiling, melting. In order to separate the chlorine and sodium atoms, you must make them undergo a chemical change, for example add the salt to sulfuric acid and make it react.

6 0

3 years ago

What is the rule when "ao" or "oo" are together when naming covalent bonds

Gnoma [55]

They are converted into a single “o” when "ao" or "oo" are together when naming covalent bonds.

<h3>What is a covalent bond?</h3>

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms.

Sometimes, while naming the chemical compounds, a problem arises when compounds with “ao” and “oo” are written with -ide name. Conventionally, they are converted into a single “o”.

For example, the “ao” in the dichlorine hept-ao-xide ( $Cl_2O_7$ ). This “ao” in the $Cl_2O_7$ can be converted into “o”. As the result, the correct name of this compound would be dichlorine hept-o-xide.

Hence, they are converted into a single “o” when "ao" or "oo" are together when naming covalent bonds.

Learn more about the covalent bond here:

brainly.com/question/12661797

#SPJ1

8 0

2 years ago

This planet has the largest temperature range in the solar system.

Tems11 [23]

Answer:

Mercury did u want me to explain or u wanted the answer

Explanation:

8 0

3 years ago

Consider the following reaction:

lyudmila [28]

Answer:

Explanation:

Fe + Cl₂ → FeCl₃

a. The balanced equation

All chemical equations obey the law of conservation of matter. To balance this above equation, we either inspect or use mathematical method to obtain a balanced equation.

We put coefficients a, b and c at the back of the compounds as shown below:

aFe + bCl₂ → cFeCl₃

For Fe:

a = c (i)

For Cl:

2b = 3c (ii)

let a = 1, c= 1

Solving for the unknown b, we have:

b = $\frac{3c}{2}$

b = $\frac{3}{2}$

The complete reaction equation is therefore:

Fe + $\frac{3}{2}$ Cl₂ → FeCl₃

2Fe + 3Cl₂ → 2FeCl₃

Problem a:

Mass of reacting iron = 25g

unknown: number of moles of iron

Solution

To find the number of moles, we apply the mole concept using the expression below:

$number of moles = \frac{mass}{molar mass} \\$

To find the molar mass of the reactant iron, we know atomic mass of iron is 56g.

The molar mass is therefore, 56gmol⁻¹

$number of moles = \frac{25}{56} \\$

number of moles of the iron reactant = 0.45mole

Problem b:

From the balanced equation of the reaction:

2Fe + 3Cl₂ → 2FeCl₃

2 moles of Fe produces 2 moles of FeCl₃

So 0.45mole of Fe would produce 0.45 mole of FeCl₃

Problem C:

Applying the mole concept;

mass of FeCl₃ = number of moles of FeCl₃ x molar mass of FeCl₃

number of moles of FeCl₃ = 0.45mole

molar mass of FeCl₃ = ?

Atomic mass of Fe = 56g

Cl = 35.5g

Molar mass of FeCl₃ = 56 + (3 x 35.5) = 56 + 106.5 = 162.5gmol⁻¹

mass of FeCl₃ = 0.45 x 162.5 = 73.1g

5 0

3 years ago