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3 years ago

A molecule in which the central atom has no lone pairs and forms four single bonds is said to have a ________ shape.

Chemistry

2 answers:

Sergeeva-Olga [200]3 years ago

8 0

Answer: tetrahedral

Explanation:

Hybridization is calculated using the Lewis dot structures of all the compounds.

Formula used to calculate the number of atomic orbitals around central metal atom is:

Number of atomic orbitals around central metal atom = Number of bond pairs + Number of lone pairs

Bond pairs for a double bond and triple bond is taken as 1 only.

Given: Number of bond pairs = 4

Number of lone pairs = 0

If Number of atomic orbitals around central metal atom are 4 , the hybridization is $sp^3$ and electron domain geometry is tetrahedral.

Margarita [4]3 years ago

4 0

It should be tetrahedral. Good example is CH4

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3 years ago

The equation below represents a double replacement/displacement reaction;

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We know that the answer would be KCl because of the switching that takes place during a double displacement reaction. Just like Zn and MnO4 switched and combined, the remaining elements, K and Cl, will combine.
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3 years ago

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Answer:

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3 years ago

The freezing point of a nonelectrolyte solution containing 30.0 g of a solute dissolved in 250.0 g of water is observed to be -2

scZoUnD [109]

Answer:

Molar mass of solute is 89.28 g/m

Explanation:

Colligative property of freezing point depression to solve this:

ΔT = Kf . m . i

i = number of particles, dissolved in solution. In this case, it is a nonelectrolyte, so i = 1.

m = molalilty (mol of solute/1kg of solvent

ΔT = T° freeze pure solvent - T° freeze solution

0°C - (-2.50°C) = 1.86 °C/m . m

2.50°C / 1.86 m/°C = m

1.34 mol solute/kg solvent = m

This means, that in 1000 g of solvent, we have 1.34 moles but we have 250 g of solvent, so let's make a rule of three.

1000 g ____ 1.34 moles

250 g _____(2.50 . 1.34) / 1000 = 0.336 moles

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3 years ago

The forensic technician at a crime scene has just prepared a luminol stock solution by adding 15.0 gg of luminol into a total vo

Firdavs [7]

Answer:

1.13 M

Explanation:

Given data

Mass of luminol (solute): 15.0 g

Volume of solution = volume of water = 75.0 mL = 0.0750 L

Molar mass of luminol: 177.16 g/mol

The molarity of the stock solution of luminol is:

M = mass of solute / molar mass of solute × liters of solution

M = 15.0 g / 177.16 g/mol × 0.0750 L

M = 1.13 M

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