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elena-14-01-66 [18.8K]
3 years ago
8

Explain how you can use the lewis dot structure to determine whether the element selenium would form a cation or anion. What is

the most common selenium ion?
Chemistry
1 answer:
snow_lady [41]3 years ago
6 0

Answer:

Anion, Se^{2-}

Explanation:

Lewis structures are the diagrams which represent valence electrons of the atoms.

<u>The Lewis symbols help to visualize valence electrons of the atoms and also the number of ions gained or lost by the atom to complete their octet and get stable.</u>

The electronic configuration of selenium is : 2,8,18,6

The Lewis representation of the atom is:

: \ddot Se :

<u>The valence electrons are 6 and it will gain 2 electrons to form corresponding anion. </u>

Thus most common form of selenium ion is Se^{2-}

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Please include an explanation
Vesna [10]

Answer:

The explanation to your question is below.

Explanation:

In thermochemistry, reactions are classify in two groups.

- Endothermic reactions: are reactions that need energy (heat) from the surroundings to happen. If they are not heated, the products will not form.

Example:

                        2 H₂O + energy ⇒ 2H₂  + O₂

-Exothermic reactions: are reactions that release energy to the surroundings. They happen spontaneously.

Example:

                       CH₄  + 2O₂   ⇒   CO₂   +  2H₂O + energy (heat)

4 0
3 years ago
Which of the following statements is true according to the law of conservation of energy?
andreev551 [17]
<span>The statement that is true according to the law of conservation of energy is D. all of the above. Energy cannot be created, it already exists everywhere around us. Energy cannot be destroyed, as it will always be present in some form or another. Energy can be converted from one form to another, and thus it will always exist without being destroyed.Hope this helps. Let me know if you need additional help!</span>
8 0
3 years ago
Read 2 more answers
What is the empirical formula for a substance that contains 3.730% hydrogen, 44.44% carbon, and 51.83% nitrogen by mass?\?
Vlada [557]

Given data:

Hydrogen (H) = 3.730 % by mass

Carbon (C) = 44.44%

Nitrogen (N) = 51.83 %

This means that if  the sample weighs 100 g then:

Mass of H = 3.730 g

Mass of C = 44.44 g

Mass of N = 51.83 g

Now, calculate the # moles of each element:

# moles of H = 3.730 g/ 1 g.mole-1 = 3.730 moles

# moles of C = 44.44/12 = 3.703 moles

# moles of N = 51.83/14 = 3.702 moles

Divide by the lowest # moles:

H = 3.730/3.702  = 1

C = 3.703/3.702 = 1

N = 3.702/3.702 = 1

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3 0
3 years ago
Which of the following types of equations will include spectator ions
krek1111 [17]

Answer:- B) Full ionic equation

Explanations:- A molecular equation does not have ions. It is the non charge form of the elements of compounds. When we write the full or total ionic equation for the molecular equation then ions are written for the aqueous species. The ions present on both sides(reactant and product sides) in a full ionic equation are known as spectator ions or common ions. These ions are canceled to get the net ionic equation. For example, reaction of aqueous solution of silver nitrate with aqueous solution of barium chloride to form aqueous solution of barium nitrate and a precipitate of silver chloride.

Balanced molecular equation:-

BaCl_2(aq)+2AgNO_3(aq)\rightarrow Ba(NO_3)_2(aq)+2AgCl(s)

Full ionic equation:-

Ba^+^2(aq)+2Cl^-(aq)+2Ag^+(aq)+2NO_3^-(aq)\rightarrow Ba^+^2(aq)+2NO_3^-(aq)+2AgCl(s)

If we look at the above full ionic equation then barium ion and nitrate ions are the spectator ions are they are present on both sides.

So, while writing the net ionic equation, these spectator ions are canceled.

Net ionic equation:-

2Cl^-(aq)+2Ag^+(aq)\rightarrow2AgCl(s)

So, it is also clear from the above example that it's the full ionic equation that include spectator ions.

6 0
3 years ago
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If two objects have the same mass, what must be true? choose the correct answer A. They have the same volume B. They are made of
Nataly_w [17]
C. Mass is kind of like a measurement of matter.
7 0
4 years ago
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