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3 years ago

Which resources are unevenly distributed throughout Earth?

Chemistry

1 answer:

ryzh [129]3 years ago

4 0

Answer:

Some natural resources like sunlight and wind are found everywhere, but other natural resources are unevenly distributed. Resources like oil, coal, and natural gas are only found where conditions were favorable to grow and preserve large quantities of animal or plant matter.

Explanation:

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Which of the following best helps to why the value of Delta H degree for the CaF_2 in water in positive? A. CaF_2(s) is insolubl

FromTheMoon [43]

Answer: Option (C) is the correct answer.

Explanation:

A positive value of enthalpy or $\Delta H$ means that energy is being absorbed from the surrounding. As $CaF_{2}$ has strong ionic bonding between both calcium and fluorine atoms. So, to break their bond we need to provide energy to it.

So, when $CaF_{2}$ is dissolved in warm water then warm water molecules will bombard with the stable bond of $CaF_{2}$ . As a result, the energy will transfer from water to the bond in order to break it. And, due to loss in internal energy then there will be consequent lowering of temperature.

When this bond is broken down then the atoms will separates into gaseous ions and these ions will be then surrounded by the water molecules. As ithe bond between $CaF_{2}$ is very strong hence, its lattice energy will be very high.

Thus, we can conclude that the statement $Ca^{2+}$ ions have very strong interactions with $F^{-}$ ions in the crystal lattice, best helps to why the value of $\Delta H$ degree for the $CaF_{2}$ in water in positive.

7 0

3 years ago

Which statement about the relationship between laws, hypotheses, and theories is true?

ludmilkaskok [199]

If a hypothesis is not contradicted after a lot of testing it may be considered a law

8 0

4 years ago

Read 2 more answers

At what pressure would 11.1 moles of a gas occupy 44.8 L at 300 K?

faltersainse [42]

Answer:

$P=6.10atm$

Explanation:

Hello,

In this case, we can study the ideal gas equation that relates temperature, volume, pressure and moles as shown below:

$PV=nRT$

Thus, since we are asked to compute the pressure y simply solve for it as follows:

$P=\frac{nRT}{V}=\frac{11.1mol*0.082\frac{atm*L}{mol*K}*300K}{44.8L}\\ \\P=6.10atm$

Best regards.

5 0

3 years ago

Which of the following best describes a double-replacement reaction?

Mariulka [41]

The answer is B for apex!

7 0

4 years ago

Why is the law of conservation of mass law and not a theory?

Elodia [21]

Answer:

In physics and chemistry, the law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed.

Explanation:

That is what I think on the subject

8 0

3 years ago