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denis23 [38]
2 years ago
10

What did Stephen hawking do that was important

Chemistry
1 answer:
azamat2 years ago
4 0
Hawking was the first to set out a theory of cosmology explained by a union of the general theory of relativity and quantum mechanics.
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When an alkane reacts with an element from group 7a, the reaction is referred to as?
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Alkanes are saturated hydrocarbon, that is they contain hydrogen and carbon without a double or triple bond between the carbon atoms, e.g. ethane, propane. Group 7a in the periodic table are called halogens e.g chlorine, bromine. Alkanes react with halogens in a reaction called substitution, where halogens replace hydrogen atoms in alkanes.
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3 years ago
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Harim placed 5mL of ethanol into a container that weighs 1 gram using a dropper. He already knew the density of ethanol is 0.78
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An alkane with the formula C6H14 can be prepared by hydrogenation of either of two precursor alkenes having the formula C6H12.
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Two precursor alkenes

    H₃C  CH₃
         I   I
H₂C=C-CH-CH₃    2,3-dimethyl-1-butene

   H₃C      CH₃
        I       I
H₃C-CH=CH-CH₃    2,3-dimethyl-2-butene


alkane

   H₃C     CH₃
        I      I
H₃C-CH-CH-CH₃    2,3-dimethylbutane

    H₃C  CH₃                        H₃C     CH₃
         I   I                                   I      I
H₂C=C-CH-CH₃  + H₂ → H₃C-CH-CH-CH₃ 
  
    H₃C   CH₃                       H₃C     CH₃
        I    I                                   I      I
H₂C-C=CH-CH₃  + H₂ → H₃C-CH-CH-CH₃ 

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3 years ago
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Why not a mosquito net easily.​
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because a mosquito net prevent mosquito bites

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2 years ago
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In which state(s) of matter are the<br> particles free to move at Gut relative to<br> one another?
Colt1911 [192]
The answer is gas only.
hope this helps!
8 0
3 years ago
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