CHEMISTRY HIGH SCHOOL

Using the balanced equation below, how many grams of cesium fluoride would be required to make 73.1 g of cesium xenon heptafluoride?CSF + XeF6 → CsXeF7

Answers

Answer 1
Answer:

Answer:

27.9 g

Explanation:

CsF + XeF₆ → CsXeF₇

First we convert 73.1 g of cesium xenon heptafluoride (CsXeF₇) into moles, using its molar mass:

  • Molar mass of CsXeF₇ = 397.193 g/mol
  • 73.1 g CsXeF₇ ÷ 397.193 g/mol = 0.184 mol CsXeF₇

As 1 mol of cesium fluoride (CsF) produces 1 mol of CsXeF₇, in order to produce 0.184 moles of CsXeF₇ we would need 0.184 moles of CsF.

Now we convert 0.184 moles of CsF to moles, using the molar mass of CsF:

  • Molar mass of CsF = 151.9 g/mol
  • 0.184 mol * 151.9 g/mol = 27.9 g

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Why potasium more reactive than lithium and sodium

Answers

So potassium is more reactive than lithium because the outer electron of a potassium atom is further from its nucleus than the outer electron of a lithium atom. Hope this answers the question. Have a nice day. Feel free to ask more questions.

952 grams of ammonium carbonate are dissolved to make 1750 mL of solution

Answers

(%m/v) =mass of solute (in g) / volume of solution (in mL) x 100
       
            = 952 g (NH4)2CO3 / 1750 mL x 100
    
            = 0.544 x 100
       
(%m/v) = 54.4 g /mL or 54.4% concentration of ammonium carbonate 
                                                solution

Juliet is using a paper towel to clean up a juice spill. The liquid sticks to the paper towel because of _____.adhesion
cohesion
specific heat
a neutral pH

Answers

When Juliet uses a paper towel to clean up a juice spill the liquid sticks to paper towels because of adhesion and absorption. Paper towels are made of cellulose fibres, which are made of sugar. Water molecules stick to the sugar.

Answer: Option (a) is the correct answer.

Explanation:

When molecules of different substance stick together due to force of attraction then this property is known as adhesion.

In the given situation juice sticks to the paper towel due to adhesion as it gets absorbed by the towel.

Thus, we can conclude that out of the given options, the liquid sticks to the paper towel because of adhesion.

Your tongue and nose work separately.
True
False

Answers

false, our tongue and nose work together
yes your tongue and nose work together

Why did the U.S. and Allied forces invade Afghanistan after 9/11?A. They knew the Taliban was responsible for the attacks.
B. They knew the Ba'ath Party was responsible for the attacks.
C. They knew that Afghanistan was harboring Osama bin Laden and other members of al-Qaeda.
D. They knew that Afghanistan was building a nuclear arsenal and planning to use dirty bombs on the U.S.

Answers

The answer is C. They knew that Afghanistan was harboring Osama bin Laden and other members of al-Qaeda.

Which formula represents a nonpolar molecule?
(1) HCl (3) NH3
(2) H2O (4) CH4

Answers

Answer:

(4) CH4

Explanation:

When there are no polar bonds in a molecule, there is no permanent charge difference between one part of the molecule and another, and the molecule is nonpolar.

In option A, HCl is not nonpolar because Cl has a pretty high electronegativity of 3.16, the H-Cl bond is polar due to the electronegative difference. This means option A is wrong.

In option B, A water molecule is polar because (1) its O-H bonds are significantly polar, and (2) its bent geometry makes the distribution of those polar bonds asymmetrical. The side of the water molecule containing the more electronegative oxygen atom is partially negative, and the side of the molecule containing the less electronegative hydrogen atoms is partially positive.

In option C, NH3 is polar because it has 3 dipoles that do not cancel out. Each N-H bond is polar because N is more electronegative than H. NH3 is overall asymmetrical in its VSEPR shape, so the dipoles don't cancel out and it is therefore polar.

In option D, CH4 looks like a C in the middle with 4 H's coming off of it. It is nonpolar because the electronegative difference is balanced. The H's all have the same electronegativities, and all cancel out since they are opposite one another.

The answer to this is (4), or CH4
This is because CH4 is both symmetrical in its molecular format and also does not have any lone pairs.
Because of that, the charges on it are balanced, and if all charges are balanced, it means that the molecule is non-polar

Answer: (4) CH4

Hope this helped!! :D
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