CHEMISTRY HIGH SCHOOL

The process of boiling a mixture so that one part will evaporate, then cooling or condensing the evaporated liquid, and finally collecting the cooled liquid, is known asa. settling.
b. filtration.
c. distillation.
d. evaporation.

Answers

Answer 1
Answer: The answer is C. Distillation. Distillation is a common process for separating liquid mixtures by using the principle of volatility and boiling point. For a liquid mixture with two liquid components A and B, A will have a lower boiling point or higher volatility than B. By boiling the mixture at the boiling point of component A, only component A will evaporate from the mixture. The evaporated gas will then be cooled to condense component A back to a liquid.
Answer 2
Answer:

The answer would be C. :))

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Ight I just here’s my first one

Answers

Answer:

D

Explanation:

Determine the percent composition of chlorine (Cl) in sodium chloride (NaCl). .

Answers

Answer:

\% Cl=61.65\%

Explanation:

Hello,

In this case, chlorine's percent composition is given by the shown below formula:

\% Cl=(n_(Cl)m_(Cl))/(M_(NaCl))*100\%

Whereas n_(Cl) accounts for the number of chlorine atoms into the NaCl, m_(Cl) for chlorine's atomic mass and M_(NaCl) for sodium chloride's molar mass, therefore, the percent composition of chlorine turns out:

\% Cl=(1*35.45)/(58.45)*100\%=61.65\%

Best regards.
It's (grams-of-Cl/total-grams)(100), so (35.45g/58.44g)(100) = 60.66% Cl. Hope this helps!

Describe your accuracy of your density measurements asummunf that you correctly identified your mystery solid and liquid

Answers

I don’t know the answer

What is the limiting reactant when 8.4 moles of lithium react with 4.6 moles of oxygen gas? Unbalanced equation: Li + O2 → Li2O

Show, or explain, all of your work along with the final answer.

Answers

Answer: Lithium

Explanation: The balanced chemical equation is:

4Li+O_2\rightarrow 2Li_2O

It can be seen, 4 moles of lithium combines with 1 mole of oxygen gas to produce 2 moles of lithium oxide.

Thus 8.4 moles of lithium combines with=(1)/(4)* {8.4}=2.1molesof oxygen gas to produce 4.2 moles of lithium oxide.

As, Lithium limits the formation of product, it is the limiting reagent and Oxygen gas is present in excess, it is called the excess reagent. (4.6-2.1)=2.5 moles of oxygen gas are present in excess.
To determine the limiting reactant, we divide the number of moles to its corresponding stoichiometric coefficient. Balancing the equation above, we get 4 Li + O2 = 2Li2O. For lithium, the result is 2.1 and for oxygen, the result is 4.6. The limiting reactant has the smaller ratio. So, the limitin reactant is lithium.

Look at the dots around each symbol and the energy levels from the resources above;Answer the questions in the text entry option for this assignment.
Copy and paste questions and respond in complete sentences.
Include a space between each question.
Be specific with your responses for each question. Assume your reader has no knowledge of the subject and you are teaching them via your answers.
Please answer the following questions:
Why does Na have only one dot?
Why do none of these diagrams show more than 8 dots?
What relationship do you notice between the dots in these two charts?
The number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table. Why? (Hint: Octet Rule (Links to an external site.))

Answers

Hello! Here's the answer I was able to come up with:

Why does Na have only one dot?

Sodium, or Na, has only one valence electron.  (This makes the atom tend to participate in ionic bonding and "give" its single valence electron to an atom like chlorine.)

Why do none of these diagrams show more than 8 dots?

It is physically impossible for an atom to have more than 8 electrons in its valence layer, according to the Octet Rule.

What relationship do you notice between the dots in these two charts?

The dot diagram for each element represents the number of electrons each element will have in its outermost, or valence, shell. (2-8-8)

The number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table. Why?

An atom can have a maximum of two electrons in its innermost layer. Hydrogen and helium have only one and two electrons, respectively, so they don't have enough electrons to actually have more than one layer. Therefore, their outermost layer is, in fact, their only layer. This is why the number of dots that hydrogen and helium have in their dot diagram is the same as the number of electrons shown for them on the Periodic Table.

Don't copy this word for word! You will most likely be in trouble for plagiarism.  Instead, rewrite these ideas in your own words, or paraphrase. Good luck, and I know you can do it! ♥  

How much heat energy is produced by 0.5 Wh of electrical energy

Answers

1 W is equivalent to 1 J/s

So,
0.5 Wh = 0.5 (J/s) (h)

Converting h to s,
0.5 (J/s) (h) (60min/1h) (60s/1min) = 1800J

Thefore,
0.5Wh is 1800J or 1.8kJ of heat energy
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