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3 years ago

Why are most solid ionic compounds electrically nonconductive, whereas aqueous solutions of ionic compounds are good conductors

Chemistry

1 answer:

Allisa [31]3 years ago

8 0

Answer:

there must be free-moving electrons in a compound to conduct electricity.

in solid ionic compounds, there are no free electrons so it can't conduct electricity.

But in aqueous form the forces of attraction are broken and the ions (cations and anions) are free to move. This means there are free electrons that allow the aqueous compound to conduct electricity.

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Which of the following molecules or ions is polar? (20 POINTS)

taurus [48]

For NO3- molecule(fig.1)

1. Bonds are created between elements with different electronegativity, most bonds would be polar. Bonds in NO3 are polar.

2. In the geometry of the molecule bond polarities cancel out each other (since it is a vector) so NO3- ion molecule is non polar

3. Nitrate (NO3-)ion geometry would be trigonal planar

For CCl4 molecule(fig.2)

1. Bonds are created between elements with different electronegativity, most bonds would be polar. Bonds in CCl4 are polar.

2. It is a completely symmetrical molecule.

3.Carbon is the centre of CCl4 have four covalent bonds and it has no lone pairs. They are all equidistant the C-Cl bond polarities cancel out. So CCl4 molecule is non polar

For NH3 molecule(fig.3)

1. Bonds are created between elements with different electronegativity, most bonds would be polar. Bonds in NH3 molecule are polar.

2. it has a pyramidal structure.

3. the individual N-H bond dipoles don't cancel out. This dipole moment for the molecule indicates that NH3 is a polar molecule

For SF6 molecule(fig.4)

1.F is more electronegative than S. So the bonds are polar.

2. The symmetry of the molecule is symmetrical so that the dipole moments of bonds cancel correspond so the molecule is non-polar.

3. it has octahedral structure

3 0

4 years ago

Describe this graph.

kati45 [8]

Answer: B.) Negative association

Explanation: if the points are going down from left to right it is negative association, if they are going up from left to right it is positive and if they are all over it is no association

7 0

3 years ago

Simulated Vinegar One way to make vinegar (not the preferred way) is to prepare a solution of acetic acid, the sole acid compone

forsale [732]

Answer:

Explanation:

Well, to make it simple, you want to make a solution of acetic acid with pH of 3 using pure acetic acid. We have the dissociation K which makes the life easier:

CH3COOH <--> CH3COO- + H+

k= [CH3COO-]*[H+]/[CH3COOH]

In the target solution [H+]=[CH3COO-]=10^-3. (Based upon pH=-log[H+])

So, all we have to know is how many starting mols of acetic acid (x) can end up with this concentration of H+.

At equilibrium and using the K you've mentioned we can write:

(10^-3)*(10^-3)/(X-10^-3)=1.74*10^-5

(Remeber that if we have a 10^-3 mol concentration of [H+], it means that 10^-3 mol of our starting acid has already dissociated to make it, hence that X-10^-3 instead of a sole X)

If we solve the above equation, we will see that X (the strarting concentration of acetic acid) is about 0.058 mol/lit. Now life gets even easier:

If a mol of acid acetic weights 60 gr, then 0.058 mols should weight... let me see... yes, 3.48 gr... And now, we have the weight, and all we need to calculate the volume, is the density (density=weight/volume), and fortunately, we have that piece of information as well... With a density of 1.049 g/ml, to have 3.49 gr of acid at hand we need to take 3.317 ml of acetic acid which can be rounded to 3.32 ml which you mentioned as the answer!

All that is left to find is that "appropriate flavouring agent" which in my opinion will eventually pose the main problem! (An ester will probably do it...)

6 0

4 years ago

Which particles are equal in number for an atom with a neutral charge?

vodka [1.7K]

Electrons and protons

4 0

3 years ago

Given the chemical equation: Fe2O3 + 3CO --> 2Fe + 3CO2

iren [92.7K]

Answer:

1 mole

Explanation:

m(Fe) = 112 g

n(Fe₂O₃) = ?

First you must calculate how many moles of Fe is in 112 g of Fe:

n(Fe) = m(Fe) / Ar(Fe) = 112 g / 55,85 g moles⁻¹ = 2 moles

Now, from reaction you compare moles of Fe and Fe₂O₃ :

2 n(Fe₂O₃) = n(Fe)

n(Fe₂O₃) = n(Fe) / 2 = 1 mole

5 0

3 years ago