What are the electrons is the outer shell of an atom called?What charge will elements in Group 2 form when they are involved in an ionic bond?

Answers

Answer 1

Answer: The answer to your first question is valence electrons. The answer to your second is positive.

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For the reaction 2HNO3 + Mg(OH)2 -> Mg(NO3)2 + 2H20 How many grams of magnesium nitrate are produced from 5.5 moles of nitric acid (HNO3)?

Answers

The amount of magnesium nitrate are formed from the 5.5 moles of the nitric acid in grams are 407.8 g.

The reaction is as :

2HNO₃ + Mg(OH)₂ ----> Mg(NO₃)₂ + 2H₂O

The number of moles of nitric acid = 5.5 moles

2 moles of the nitric acid = 1 mole of the magnesium nitrate

The number of moles of nitric acid = 5.5 / 2 mol

The number of moles of nitric acid = 2.75 mol

The grams of the magnesium nitrate = moles × molar mass

The grams of the magnesium nitrate = 2.75 mol × 148.3 g/mol

The grams of the magnesium nitrate = 407.8 g

Therefore, the mass of the magnesium nitrate is 407.8 g.

To learn more about moles here

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Ok, so i thought it through, and the answer is 815.7314 grams :)
happy to show my working out if you want/ need :)

How many sigma and pi bonds are there in phenol?

Answers

In the most simple phenol,
sigma bond = 7
pi bond = 3

Higher classes of phenol may have more number of bonds. so, don't confuse from that!

Hope this helps!

A desiccant is another name for a water molecule TRUE FALSE

Answers

Definitely, the answer is false. A desiccant is a substance used in order to absorb moisture in the surroundings. It is a hygroscopic material that removes humidity since humidity will aid in the degradation or destruction of materials which are sensitive to moisture.

If 455-mL of 6.0 m HNO3 is used to make a 2.5L dilution, what is the molarity of the dilution

Answers

2.5 L * 1000 = 2500 mL

C₁ * V₁ = C₂ * V₂

6.0 * 455 = C₂ * 2500

2730 = C₂ * 2500

C₂ = 2730 / 2500

C₂ = 1.092 M

hope this helps!

Why is the radius of a positive ion always less than the radius of its neutral atom? (A) the nucleus pulls the remaining electrons in closer.(B) The number of principal energy levels is always reduced. (C) The atomic orbitals contract all by themselves (D) Electron speeds are reduced

Answers

The radius of a positive ion always less than the radius of its neutral atom because the nucleus pulls the remaining electrons in closer.

What is an atom ?

Each atom is made up of a nucleus and one or more electrons that are linked to it. One or more protons and a significant number of neutrons make up the nucleus.

Only the most prevalent kind of hydrogen is neutron-free. The smallest component of ordinary stuff that makes up a chemical element is an atom.

Quarks and electrons are the two categories of fundamental particles that make up an atom. An atom's nucleus is surrounded by an area of electrons. The electrical charge of every electron is negative one.

Protons and neutrons, which together make up an atom's nucleus, are made of quarks.

Thus, option A is correct.

To learn more about an atom, follow the link;

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Positive ions are positive because they have lost electrons.
(A)-This sounds accurate, but is actually not true. When an atom loses an electron and forms a positive ion, there will be less negative charge from the electrons to attract the positively charged nucleus. Losing electrons will actually decrease the attraction between the electrons and the nucleus.
(B)-This is true in some cases, but not all. If, for example, sodium were to lose an electron, it would drop down to having its largest orbital being in the second energy level, and would decrease in size. If magnesium were to lose an electron, it would still have one electron in the third energy level, so it wouldn't drop down an energy level.
(C) and (D)-Not sure where these answers even came from.

The actual reason behind the radius of a positive ion being smaller than the radius of its neutral atom is that the repulsive force between the electrons themselves is decreased, causing them to move closer together.

What allows a gas to fill a container? A. the shape of the particles in a gas
B. the size of the particles in a gas
C. the constant motion of the particles in a gas

Answers

Answer: Option (A) is the correct answer.

Explanation:

It is known that particles of a gas are held by weak Vander waal forces, therefore, there is no force of attraction between gas molecules.

As a result, these particles are in random motion.

Thus, we can conclude that out of the given options, the constant motion of the particles in a gas allows a gas to fill a container.

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