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3 years ago

Which substances dissolves in pure water and produces a solution that is a good conductor of electricity?

Chemistry

2 answers:

lyudmila [28]3 years ago

4 0

CaCl2 is a good conductor of electricity when dissolved in water.

Elanso [62]3 years ago

4 0

Answer:

$CaCl_2$

Explanation:

We have to keep in mind that a good conductor would be a substance that has the ability to produce ions (charged species). These species are responsible for the electricity conduction on water.

Therefore, we have to check which ones of these compounds will produce ions in water. For $N_2$ and $O_2$ we have diatomic molecules (also gases) this type of molecules don't have the ability to produce ions due to his simplicity, they already are very stable.

In the sugar molecule $C_6H_12O_6$ we have a covalent compound. The ions are produced by ionic compounds. So, this molecule can be discarded too.

For $CaCl_2$ we have an ionic compound that have the ability to produce ions:

$CaCl_2~~->~~Ca^+^2~+~2Cl^-$

So, this is the compound that would be a good conductor due to the $Ca^+^2$ and the $Cl^-$ ions.

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You have 125 g of a certain seasoning and are told that it contains 70.0 g of salt. What is the peroentage of salt by mass in th

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$\frac{70}{125} \times 100 = 56\%$

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4 years ago

Read 2 more answers

g A gas is compressed in a cylinder from a volume of 20.0 L to 2.0 L by a constant pressure of 10.0 atm. Calculate the amount of

Lemur [1.5K]

Answer:

The amount of work done on the system is 18234 J and the final positive sign means that this work corresponds to an increase in internal energy of the gas.

Explanation:

Thermodynamic work is called the transfer of energy between the system and the environment by methods that do not depend on the difference in temperatures between the two. When a system is compressed or expanded, a thermodynamic work is produced which is called pressure-volume work (p - v).

The pressure-volume work done by a system that compresses or expands at constant pressure is given by the expression:

W system= -p*∆V

Where:

W system: Work exchanged by the system with the environment. Its unit of measure in the International System is the joule (J)
p: Pressure. Its unit of measurement in the International System is the pascal (Pa)
∆V: Volume variation (∆V = Vf - Vi). Its unit of measurement in the International System is cubic meter (m³)

In this case:

p= 10 atm= 1.013*10⁶ Pa (being 1 atm= 101325 Pa)
ΔV= 2 L- 20 L= -18 L= -0.018 m³ (being 1 L=0.001 m³)

Replacing:

W system= -1.013*10⁶ Pa* (-0.018 m³)

Solving:

W system= 18234 J

The amount of work done on the system is 18234 J and the final positive sign means that this work corresponds to an increase in internal energy of the gas.

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3 years ago

1. The diagram above shows the repeating groups of atoms that make up two samples. Will the

serious [3.7K]

Answer:

Will likely be the same

Explanation:

We can see in both pictures there is a black molecule and a red molecule. However, we also have a purple molecule in one image and a yellow in the other. It would LIKELY be the same because we have more of the same molecules then more different molecules. Hope this helps

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3 years ago

Can you please tell me what is a rock?

ivann1987 [24]

Answer:

its on goggle!

Explanation:

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3 years ago

How long will it take for 100 grams of a substance with a half-life of 2 years to decay to a mass of 50 grams?

Elis [28]

Answer:

2 years to decay to a mass of 50g.

Explanation:

given:

100g of substance with a half life of 2 years

to a mass of 50g

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

ln 2 0.693

Half life T1/2 = ---------- = -----------

λ λ

where λ = rate constant

The initial amount of 100 grams is decaying to a mass of 50 grams is half of its initial value.

Therefore, it will take 2 years for the decay.

3 0

3 years ago