CHEMISTRY HIGH SCHOOL

Which statement is NOT TRUE about elements in group 16?a. They need two electrons to complete their octet.
b. They have an oxidation number of 2-
c. They have an oxidation number of 2+
d. The have six valence electrons.

Answers

Answer 1
Answer:

All the statement is true about the elements of group 16.

What is Groups and Periods in Periodic table ?

In periodic table 18 vertical column are present which is called groups which are arranged from left to right in the periodic table.

In periodic table 7 horizontal rows are present which is called periods.

Now lets check all options one by one.

Option (A): They need two electrons to complete their octet.

In periodic table Group sixteen have 6 elements in its valence shell. Group 16 elements needed two electrons to complete the octet valency. The valency of group 16 elements is 2. So it is true about the group 16 elements.

Hence, it is incorrect option.

Option (B): They have an oxidation number of 2-

Group 16 show variable oxidation state that is -2, +2, +4 and +6. So the statement is true.

Hence it is incorrect option.

Option (C): They have an oxidation number of 2+.

Group 16 show variable oxidation state that is -2, +2, +4 and +6. So the statement is true.

Hence it is incorrect option.

Option (D): They have six valence electrons

Group 16 elements are called Chalcogens. They have 6 valence electron so they achieve noble gas configuration. So it is true statement.

Hence, it is incorrect option.

Thus, from the above conclusion we can say that all the statement is true about the elements of group 16.

Learn more about the Group 16 elements here: brainly.com/question/19965333
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Answer 2
Answer: The most suitable answer is C becuase they would gain two elctrons to atain that stable OCTET thus becoming a anion with a charge of -2 and by virtue oxidation states of -2.  There is however an exception with oxygen in two cases. But I still remain that the best answer would be C

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Note from the formulas of the reactants that one is an acid and one is a base. The precipitate formed is therefore a salt. What is the balanced formula for this salt?1. OH
2. Ba2SO4
3. BaSO4
4. Ba(SO4)2

Answers

BaSO4 is the answer for this question i did the math

Answer:

3. BaSO4

Explanation:

the math will show you, and to answer your commented question "How does this evidence indicate that the reaction has occurred between ions ?" :

The reaction of the ions can be checked by a number of methods. In a chemical reaction, the ions are in the aqueous solution. This means that they are in solution, dissolved with charge. During the reaction (ionic) there is an attraction between the positive and negative ions. This makes a change in the state of the reactants in the products. In addition, the reaction can result in an immediate observable change such as the formation of a solid or precipitation.  

What is a chemical property?

Answers

chemical properties include reactivity with other elements of substances, toxicity, flammability, and chemical stability
just to name a few

What is a chemical bond?a. a representation of chemical properties
b. a substance that's composed of atoms
c. the force that holds together the elements in a compound
d. the attraction of two atoms that holds the atoms togethe?

Answers

Answer: -

A chemical bond is

C) the force that holds together the elements in a compound.

Explanation: -

A chemical bond results when there is a transfer of electrons from 1 element to another or there is a sharing of electrons between two element atoms.

Due to this compounds are formed.

Hence A chemical bond is

C) the force that holds together the elements in a compound.

the correct answer should be c.

How does thermal energy travel?

Answers

Thermal energy travels by conduction, convection, and radiation. It occurs when a cooler and warmer object touches each other. 
Thermal energy travels by conduction, convection, and radiation. Conduction occurs when two or more objects of different temperatures are touching each other. The heat flows from the warmer object to the cooler object, until the objects reach equal temperatures.
I hope this helps! :)

Write and balance this equation. Solid iron reacts with fluorine gas to produce crystalline iron(III) fluoride.

Answers

The balanced equation is: 2Fe + 3F2 ⇒ 2FeF3

How to balance an equation?

A chemical equation needs to be balanced if you want to make the wide variety of the atoms of the reactants equal to the variety of the atoms of the goods.

Given,

Iron + fluorine ⇒ Iron Flouride

Fe + F2 ⇒ FeF3

Now to balance this reaction:

2Fe + 3F2  ⇒ 2FeF3

This reaction is balanced.

What is iron fluoride used for?

This medicine is a mixture manufactured from nutrients, iron, and fluoride. it's miles utilized in infants and youngsters to deal with or prevent deficiency because of terrible weight loss programs or low tiers of fluoride in drinking water and other sources.

Learn more about iron fluoride here: brainly.com/question/24072912

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Answer:

iron+flourine.............iron flouride

Fe+F2.............FeF3

the above reaction is not balanced

now to balance this reaction

2Fe+3F2...........2FeF3

now this reaction is balanced

The atom in a sample of an element must contain nuclei with the same number of?

Answers

Hey there! 

Answer: Protons 

The atom in a sample of an element must contain nuclei with the same number of protons. If the protons change in number, then the element will modify as well. 

Thank you!
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