Answer:
a. 2-heptanone is more reactive than 4-heptanone
b. chloromethyl phenyl ketone is more reactive than bromomethyl phenyl ketone
Explanation:
The reactivity of the carbonyl compound (ketone ) is affected by the steric effect. The steric effect is a hindrance that occurs in the structure or reactivity of a molecule, which is affected by the physical size and the proximity of the adjacent parts of the molecule.
Between 2-heptanone or 4-heptanone, 2-heptanone is more reactive than 4-heptanone. This is because 2-heptanone is less affected by the steric hindrance, unlike the 4-heptanone.
Similarly, the reactivity of the carbonyl compound (ketone) is also affected by the polarity on the carbon compound, which is associated with how electronegative the substituent attached is to the carbonyl compound. From the periodic table, the electronegativity of the Halogen family decreases down the group. Therefore chlorine is more electronegative than bromine.
As such, chloromethyl phenyl ketone is more reactive than bromomethyl phenyl ketone.
Answer: 8855 Joules energy is released when 115 g of changes from a liquid to a solid at its freezing point.
Explanation:
Latent heat of freezing is the amount of heat released to convert 1 mole of liquid to solid at atmospheric pressure.
Amount of heat released to freeze 1 gram of = 77 J/g
Mass of given = 115 gram
Heat released when 1 g of is freezed = 77 J
Thus Heat released when 115 g of is freezed =
Thus 8855 Joules energy is released when 115 g of changes from a liquid to a solid at its freezing point.
Answer:
The concentration of arsenic in the sample in parts per billion (ppb) is 11.1538 .
Explanation:
Density of the lake water =
Amount of arsenic in 14.3 of water = 159.5 ng =
Mass of the lake water:
Concentration in parts per billion:
parts per billion
The concentration of arsenic in the sample in parts per billion (ppb) is 11.1538.
Answer:
By closed contours with hachures
Explanation:
A sinkhole is a depression in the ground that forms when water erodes an underlying rock layer.
Sinkholes are denoted by closed contours with tick marks (hachures) that point towards lower ground.
The topographical map below shows the difference between the contours of a hill and those of a sinkhole.