The basic points in Lewis and Langmuir theory of electrovalency

Answers

Answer 1

Answer: The correct answer for the question that is being presented above is this one: "Electrovalency is characterized with the transferring of one or more electrons from one atom to another together with the formation of ions and as well as the number of positive and negative charges.

The Lewis and Langmuir theory of electrovalency (and as well as Kossel's) is dealing with Ionic bonds.

Lewis: electron-pair sharing, octet rule, Lewis Symbols or StructureLangmuir: introduced term "covalent" bond, and popularized Lewis's ideas

The Lewis-Langmuir electron-pair or covalent bond is referred as the homopolar bond, where the complete transfer of electrons give rise to ionic, or electrovalent bond (1) through attraction of opposite charges.

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Central American countries are important agricultural producers. Each year, the United States imports about five billion dollars’ worth of __________.a. bananas
b. cacao
c. mangoes
d. coffee

Answers

a. bananas

Central American countries are important agricultural producers. Each year, the United States imports about five billion dollars’ worth of bananas.

NOT:

b. cacao
c. mangoes
d. coffee

correct answer is D COFFEE

What is the new boiling point if 25 g of NaCl is dissolved in 1.0 kg of water

Answers

The correct answer for the question that is being presented above is this one:

Given that:
delta Tb = Kbm Kb H2O = 0.52 degrees C/m
delta Tf = Kfm Kf H2O = 1.86 degrees C/m

We need to know the formula for Molality.
molality = mol solute / kg solvent

We are given the amount of solute in grams
Since amount of solute is given in moles, we have to convert 25 g NaCl to moles. Divide by molar mass.

25 g NaCl / 58.5 g/mol = 0.427 mol

Then, use the formula for molality.

molality = mol solute / kg solvent
= 0.427 / 1
= 0.427 m

Use now the formula to get the boiling point.

delta Tb = Kbm
= (0.52)(0.427)
= 0.22C

Is the following a chemical change or a physical change? A pencil is sharpened in a pencil sharpener, leaving behind shaving. Physical Change Chemical Change

Answers

This is an example of physical change, because the pencil's chemical composition does not change.

*Physical Change.*
A physical change in a substance doesn't change what the substance is.
A Chemical change, there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

If a plant needs to make 12.6 g of glucose(c6h1206), how many grams of water are required?

Answers

Answer: 7.6 g of water are required to make 12.6 g of glucose

Explanation:

Moles is calculated by using the formula:

$Moles=\frac{\text{Given mass}}{\text{Molar mass}}$

${\text {moles of glucose}}=(12.6g)/(180g/mol)=0.07moles$

The balanced chemical equation is:

$6CO_2+6H_2O\rightarrow C_6H_(12)O_6+6O_2$

According to stoichiometry:

1 mole of glucose is produced by = 6 moles of water

Thus 0.07 moles of glucose is produced by = $(6)/(1)* 0.07=0.42$ moles of water

Mass of water required = $moles* {\text {Molar mass}}=0.42mol* 18g/mol=7.6g$

Thus 7.6 g of water are required to make 12.6 g of glucose

What is the total number of moles of hydrogen atoms contained in 1 mole of (nh42c2o4?

Answers

The answer is 8. Hope this helps.

ANYONE KNOW THIS ILL GIVE YOU BRAINLIEST..... the question is a variety of energy transformations occur in different situations which statement involves change from chemical to electromagnetic to mechanical to sound energy..... The pic are the answer choices

Answers

GREETINGS!

IT SHOULD BE OPTION C

Because when you use mobile the chemical energy stored in the battery is used to make your mobile work, and Mobile phones communicate by Electromagnetic radio waves, and if u look at the option C it says PLAYS AVIDEO ON YOOOUTUBE that means sound energy so c is your answer

HOPE THIS HELPS YOU!

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