CHEMISTRY MIDDLE SCHOOL

Said that everything in the universe is made up of tiny particles called "atomnos". Dalton
Copernicus
Democritis

Answers

Answer 1
Answer: Democritus said that everything in the universe is made up of tiny particles called atoms ......

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COLLEGE

Balance the equation and show the calculation of the number of moles and grams of Ca3(PO42 formed from 10.8 grams of Ca(OH)2. Show your answers to 3 significant figures Ca(OH)2 H3PO4-- Ca3(PO4)2 + H2O]

Answers

Answer:

The number of moles of calcium phosphate is 0.0485 mol. The mass is 15.1 g.

Explanation:

The balanced equation is:

Ca_{3}(PO_{4})_{2} + 6H_{2}O" alt="3 Ca(OH)_{2} + 2 H_{3}PO_{4} => Ca_{3}(PO_{4})_{2} + 6H_{2}O" align="absmiddle" class="latex-formula">

As we can see, 3 moles of calcium hidroxide produced 1 mol of calcium phosphate. So the quantity of moles of Calcium posphate is:

The mass of calcium phosphate in grams is:

HIGH SCHOOL

The atomic mass of chlorine is listed as 35.454 amu on the periodic table. It has two naturally occurring isotopes, Cl-35 and Cl-37. What are the approximate percentages of each?

Answers

X=percentage of Cl-35
(1-x)=percentage of Cl-35

35(x)+37(1-x)=35.454
35x+37-37x=35.454
-2x=35.454-37
-2x=-1.546
x=-1.546/(-2)
x=0.773

0.773=77.3/100=77.3%

(1-x)=1-0.773=0.227

0.227=22.7/100=22.7%

answer: the percentages are: 77.3% of Cl-35 and 22.7% of Cl-37. 

COLLEGE

What is the mass of 1.70 moles of magnesium chloride, MgCl2?

Answers

162 grams First, look up the atomic weight of all involved elements Atomic weight Magnesium = 24.305 Atomic weight Chlorine = 35.453 Now, calculate the molar mass of MgCl2 24.305 + 2 * 35.453 = 95.211 g/mol Finally, multiply the molar mass by the number of moles 95.211 g/mol * 1.70 mol = 161.8587 g Rounding to 3 significant figures gives 162 grams.
HIGH SCHOOL

Explain two ways that voltaic cells and electrolytic cells are similar AND two ways that they differ.

Answers

Similarities:
•They both have cathode and anode charges.
•Cathode facilitates oxidation and the anode facilitates reduction.

Differences:
•Voltaic cells “work” autonomously, while electrolytic cells need an outside source of energy to work.
•While the voltaic cells’ redox reaction is uncalled-for, the electrolytic cells happen at a set time.

I hope I helped!
Chemistry is pretty hard to explain, so feel free to message me or leave a comment below if you need me to elaborate on my response. :)
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