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2 years ago

Coal is plentiful and inexpensive; therefore many countries use it despite its environmental impacts. True or False

2 answers:

6 0

That statement is true
Despite its cheap price, The usage of coal as an energy source will release sulfur dioxide, nitrogen oxides, to the air around our environment.
This substance will give negative effects such as acidic rain that could be corrosive to our body and polluted air that is bad for our respiratory system.

Kay [80]2 years ago

3 0

True because it is something that will last for a while

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Some animals that live in extremely cold environments protect themselves from freezing by increasing the molality of certain che

lara [203]

Molality is defined as the number of moles of solute dissolved per 1000g(1kg) of solvent.
It is represented by m

$\\ \sf \longmapsto m=\dfrac{Moles\:of\:solute}{Wt\:of\:solvent(in\:g)}\times 1000$

8 0

3 years ago

The solubility product of PbI2 is 7.9x10^-9. What is the molar solubility of PbI2 in distilled water?

Agata [3.3K]

Answer: The molar solubility of $PbI_2$ is $1.25\times 10^{-3}mol/L$

Explanation:

Solubility is defined as the maximum amount of solute that can be dissolved in a solvent at equilibrium.

Solubility product is defined as the product of concentration of ions present in a solution each raised to the power its stoichiometric ratio.

The balanced equilibrium reaction for the ionization of calcium fluoride follows:

$PbI_2\rightleftharpoons Pb^{2+}+2I^-$

s 2s

The expression for solubility constant for this reaction will be:

$K_{sp}=[Pb^{2+}][I^-]^2$

We are given:

$K_{sp}=7.9\times 10^{-9}$

Putting values in above equation, we get:

$7.9\times 10^{-9}=(s)\times (2s)^2\\\\7.9\times 10^{-9}=4s^3\\\\s=1.25\times 10^{-3}mol/L$

Hence, the molar solubility of $PbI_2$ is $1.25\times 10^{-3}mol/L$

3 0

2 years ago

Which statement describes the condition in which diamonds form?

eduard

I think it's A but it might be different from your school and mine

4 0

3 years ago

Read 2 more answers

Which of these reactions successfully models a nuclear fission reaction?

user100 [1]

Answer:

OPTION B

Explanation:

Nuclear "fission" is the breakdown of the nucleus of a radioactive element into two or more nuclei accompanied by the release of energy. I guess that pretty much explains it.

3 0

2 years ago

The concentration of which ion is increased when LiOH is dissolved in water?

Oksana_A [137]

Answer:

hydroxide ion would be the answer

3 0

2 years ago