Which formula represents a polar molecule?
(1) O2
(2) CO2
(3) NH3
(4) CH4

Answers

Answer 1

Answer:

Answer: Option (3) is the correct answer.

Explanation:

A molecule is polar when the net dipole moment of molecule is zero. When an electronegative atom is attached to an electropositive atom then the electronegative atom pulls the shared pair of electrons more towards itself.

As a result, the movement of electrons is more towards the electronegative atom and the dipole moment becomes zero. This will also induce partial positive and partial negative charge on electropositive and electronegative atom.

On the other hand, $O_(2), CO_(2), and CH_(4)$ are covalent compounds and does not have a net zero dipole moment.

Thus, we can conclude that out of the given options $NH_(3)$ represents a polar molecule.

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Why are plant cells and animal cells diffrent?

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How many liters of 0.1107 M KCI contains 15.00 g of KCI (FW= 74.6 g/mol)

Answers

Answer:

1.81 liters of KCl solution

Explanation:

Molarity is expressed as:

$Molarity=(molesofsolute)/(litersofsolution)$

Solving for Liters of solution:

Liters of solution = $(molesofsolute)/(Molarity)$ (1)

Using the molecular weight fo the KCl to find the moles of solute:

$15.00gKCl*(1molKCl)/(74.6gKCl)=0.20molesKCl$

Replacing in the formula (1):

Liters of solution = $(0.20molesKCl)/(0.1107M)$

Liters of solution = 1.81 liters

Number of moles:

n = sample mass / molar mass

n = 15.00 / 74.6

n = 0.2010 moles of KCl

Therefore:

Molarity = moles / Volume

0.1107 = 0.2010 / V

V = 0.2010 / 0.1107

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In the late 1800s, the British scientist J. J. Thomson discovered that atoms were composed of positively-charged and negatively-charged particles. He proposed that these two types of particles were evenly mixed throughout the structure of the atom. How does this atomic model differ from current atomic models?A. Current atomic models show that atoms do not have positively-charged particles.

B. Current atomic models show an atom's positively-charged particles concentrated in the center of the atom.

C. Current atomic models show that atoms do not have negatively-charged particles.

Answers

Option B.

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Consider the reaction of CaC2 and water to produce CaCO3 and NH3 according to the reaction CaCN2 + 3H2O → CaCO3 + 2 NH3 . How much CaCO3 is produced upon reaction of 45 g CaCN2 and 45 g of H2O

Answers

Answer:

16.27 g of CaCO3 are produced upon reaction of 45 g CaCN2 and 45 g of H2O.

Explanation:

Ca(CN)2 + 3H2O → CaCO3 + 2 NH3

First of all, let's find out the limiting reactant.

Molar mass Ca(CN)2.

Molar mass H2O: 18 g/m

Moles of Ca(CN)2: mass / molar mass

45 g / 92.08 g/m = 0.488 moles

Moles of H2O: mass / molar mass

45g / 18g/m = 2.50 moles

This is my rule of three

1 mol of Ca(CN)2 needs 3 moles of H2O

2.5 moles of Ca(CN)2 needs (2.5 . 3) / 1 = 7.5 moles

I need 7.5 moles of water, but I only have 0.488. Obviously water is the limiting reactant; now we can work on it.

3 moles of water __ makes __ 1 mol of CaCO3

0.488 moles of water __ makes ___ (0.488 . 1) / 3 = 0.163 moles

Molar mass CaCO3 = 100.08 g/m

Molar mass . moles = mass

100.08 g/m . 0.163 moles = 16.27 g

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Answers

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The metals are a compound that loses electrons and nonmetals gains electrons to form a chemical bond.

Elements bonding with Lithium

Lithium has been a group 1 element with 1 valence electron. It has been bonding with the nonmetals that accept the electrons and form the bond. The elements complete their octet and become stable.

The nonmetals that require an electron to complete their octet are halogens. Thus, the elements that accept the electron of Lithium are Fluorine, Chlorine, Bromine, and Iodine.

Learn more about Lithium, here:

brainly.com/question/1439744

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Which statement best explains why heating a liquid affects its viscosity?

Answers

The statement that best explains why heating a liquid affects its viscosity is that "The molecules move faster at higher temperatures and overcome attractions more easily.". Remember that viscosity is a physical property of the fluids that measure the resistance (opposition) to flow and it, generally decreases, as the temperature increases and the intermolecular force decrease.

Answer:

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Explanation:

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