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Mamont248 [21]
3 years ago
6

. I am described as being conductive, malleable, shiny, and reactive with HCl. I am one of the most reactive elements. I turn bl

ack within seconds when I am exposed to air. If someone drops water on me, I will explode. When I do explode I send off characteristic purple-red (violet) flame. Who am I?
Chemistry
1 answer:
mylen [45]3 years ago
8 0

Answer:

Potassium

Explanation:

Most reactive metal in the reactivity series

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What is the approximate percent yield for this reaction?<br> Ba(NO3)2 + Na2SO4 —&gt; BaSO4 + 2 NaNO3
melomori [17]

The percent yield for this reaction is 91%.

<u>Explanation</u>:

                   Ba(NO3)2 + Na2SO4 — > BaSO4 + 2NaNO3  

  • Assume that 0.45 mol of Ba(NO3)2 reacts with excess Na2SO4 to create 0.41 mol of BaSO4.  
  • Convert to grams of BaSO4 utilizing its molar mass (233.38 g/mol), which will be giving the actual yield.  
  • Actual Yield = 0.41 mol BaSO4 x (233.38 g BaSO4/1 mol BaSO4)  

                               = 96 g BaSO4  

  • Beginning with 0.45 mol of Ba(NO3)2, compute the theoretical yield of BaSO4. Mole proportion of Ba(NO3)2 to BaSO4 is 1:1.  
  • 0.45 mol Ba(NO3)2 x (1 mol BaSO4/1 mol Ba(NO3)2) x (233.38 g BaSO4/1 mol BaSO4) = 105 g BaSO4  

                    % Yield = (Actual Yield/Theoretical Yield) x 100%  

                              = (96/105) x 100%  

                               = 91%.

6 0
3 years ago
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Assuming the metals lose all their valence electrons and the nonmetals gain electrons to complete the s-p subshells, which listi
Nataly [62]

Answer: Option (c) is the correct answer.

Explanation:

Atomic number of sodium is 11 and its electronic configuration is 1s^{2}2s^{2}2p^{6}3s^{1}. When sodium loses one electron then it will attain +1 charge and its electronic configuration will be as follows.

Na^{+} : 1s^{2}2s^{2}2p^{6}

Atomic number of fluorine is 9 and its electronic configuration is 1s^{2}2s^{2}2p^{5}. When fluorine gains an electron then it acquires -1 charge and its electronic configuration is as follows.

F^{-} : 1s^{2}2s^{2}2p^{6}

Atomic number of aluminium is 13 and its electronic configuration is 1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}. When aluminium loses its valence electrons then it acquires +3 charge and its electronic configuration is as follows.

Al^{3+} : 1s^{2}2s^{2}2p^{6}

Thus, we can conclude that the listing for aluminum is correct.

8 0
3 years ago
Write the formula of Li+ formed byOH−, NO2−, HCO3−, SO32−, HPO42−
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LiOH, LiNO₂, LiHCO₃, Li₂SO₃, Li₂HPO₄
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Consider equimolar samples of different ideal gases at the same volume and temperature. Gas A has a higher molar mass than gas B
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Answer:

I don't understand the question

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1. c

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Complete each nuclear reaction equation.
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