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3 years ago

Predict the molecular structure (including bond angles) for each of the following.

Chemistry

1 answer:

Len [333]3 years ago

5 0

Answer:

PCl3 - trigonal pyramidal <109 degrees

SCl2 - bent<109 degrees

SiF4 - tetrahedral 109 degrees

Explanation:

The shape of all three molecules derive from a tetrahedral arrangement of electron pairs.

However, in PCl3 there is a lone pair of electrons on P and three bond pairs. This leads to the observance of a trigonal pyramidal geometry with bond angle <109 degrees.

In SCl2, there are four regions of electron density around S, two lone pairs and two bond pairs leading to a bent molecular geometry with bond angle <109 degrees.

In SiF4, there are four bond pairs and no lone pair. The molecular geometry is tetrahedral with a bond angle of 109 degrees.

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I have a 5 liter container of oxygen (O 2 ) gas at 2.0 atm and 25 0 C, what mass of gas is inside this

Thepotemich [5.8K]

Answer:

$m=13.1gO_2$

Explanation:

Hello,

In this case, by using the ideal gas equation, we first compute the moles of oxygen at the given volume, pressure and temperature:

$PV=nRT\\\\n=\frac{PV}{RT}=\frac{2.0atm*5L}{0.082\frac{atm*L}{mol*K}(25+273.15)K} =0.41mol$

Then, since molar mass of gaseous oxygen is 32 g/mol, we compute the contained mass in grams as shown below:

$m=0.41mol*\frac{32g}{1mol}\\\\m=13.1gO_2$

Best regards.

3 0

4 years ago

If a water solution conducts electricity, what must the solute be

Ahat [919]

Any solute that dissolves in water to give a solution that contains ions, and which therefore conducts electricity, is called an electrolyte. On the other hand, a solute that remains undissociated in solution is called a nonelectrolyte.

6 0

3 years ago

Natural gas or methane is a fossil fuel. In a plentiful supply of air, it burns to give carbon dioxide and water. Write a balanc

Alex17521 [72]

Answer:

$CH_4 + 2O_2 --> CO_2 + 2H_2O$

Explanation:

The chemical formula for methane is $CH_4$

The chemical formula for oxygen is $O_2$

The chemical formula for carbon dioxide is $CO_2$

The chemical formula for water is $H_2O$

Methane burns in oxygen to give carbon dioxide and water:

$CH_4 + O_2 --> CO_2 + H_2O$

The balanced equation that will ensure an equal number of each atom on the left and right-hand sides of the equation would be:

$CH_4 + 2O_2 --> CO_2 + 2H_2O$

3 0

3 years ago

The volume of the salt solution is 1000 mL. If the density of the solution is 1.0g/mL, calculate the mass of the solution. Check

xxMikexx [17]

Answer:

1000kg

Explanation:

Density=mass/ volume

Mass= Density× volume

Mass= 1.0g/ml×1000ml

Mass= 1000kg

6 0

3 years ago

What is a atom of chemistry

Yuliya22 [10]

Answer:

Atom is the smallest particle of matter.

Elements are made up of same atoms.

Atom consist of electron, proton and neutron.

Explanation:

Atom was first discovered by John Dalton.

word "Atom" came from Greek word, that means something that could not split. he explained that atom is indivisible particle.

In the end of 18th century J.J. Thomson put forward a new concept of atom. he said that atom have negative charged particles called electrons but overall atom is neutral.

In 1909 Rutherford with his students discovered positive charged particles and nucleus and said that it is in the center of atom.

He explain a model of atom and said that electrons revolve around a hard core in the center called nucleus.

In 1913 Niels Bohr explains the atomic spectra and put forward the concept of shells and sub-shells.

So overall Structure of an Atom is

consist of Neutrons in nucleus
+ve charged protons in nucleus
A -vely charged electrons revolving around the nucleus
the electron revolve in shells i.e. K, L, M, and N
Each shell divide in sub-Shell such as s, p,d and f.

Atom has a specific atomic mass and atomic number

Atomic number = number of protons or electron

Atomic mass = number of protons + number of neutrons in nucleus.

8 0

4 years ago