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Lana71 [14]
2 years ago
10

Which of the following statements about alkenes is not correct?

Chemistry
1 answer:
professor190 [17]2 years ago
8 0
<span>Option-C:  They react mainly by substitution.

Explanation:
                     
Alkene doesn't give substitution reactions because they are non polar in nature. The double bond in alkene is responsible for Electrophillic Addition reactions as it electron rich and nucleophilic in nature. Reaction of Alkene is given below,</span>

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A 4.36-g sample of an unknown alkali metal hydroxide is dissolved in 100.0 mL of water. An acid-base indicator is added, and the
BARSIC [14]

Answer:

Rb+

Explanation:

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Now all the choices for the metal cation are monovalent, therefore the general formula for our unknown is XOH and  we know the reaction is 1 equivalent acid to 1 equivalent base. Thus we have the number of moles, n,  of XOH and from the relation n = M/MW we can calculate the molecular weight of XOH.

Thus our calculations are:

V = 17.0 mL x 1 L / 1000 mL = 0.017 L

2.5 M HCl x 0.017 L = 2.5 mol/ L x 0.017 L = 0.0425 mol

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MW of XOH = (atomic weight of X + 16 + 1)

so solving the above equation we get:

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0.7225 +0.0425X = 4.36

0.0425X = 4.36 -0.7225 = 3.6375

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The unknown alkali is Rb which has an atomic weight of 85.47 g/mol

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3 years ago
Is the combustion of gasoline endothermic or exothermic?
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Explanation:

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