Answer: see the photo attached. (:
Answer:
a. Propanol
b. Propanone
c. Butanal
Explanation:
From the given information:
We are to state which of the given samples are more soluble in water.
The solubility of an organic molecule in water depends on the polarity of the given organic molecule. This solubility behaviour conforms with the general rule -"like dissolve like". Solubility is a means of comparing the extent to which different solutes can dissolve in a particular solvent at a definite temperature. Water is a polar solvent; therefore, an organic molecule that will also dissolve in water must be polar.
From the first pair, we have propane and propanol.
Propanol is more soluble in water than propane due to its polarity in water.
From the second pair:
Propanone is an alkanone (ketone group) with three carbon chain directly bonded to an oxygen double bond. At the same time, 3-hexanone has six carbon chain ketone group with the oxygen double bond located at the third carbon chain ( a hydrophobic "water-fearing" compound). Thus, the shorter the carbon chain, the more polar the organic molecule is and the more it is likely going to dissolve in water. Therefore, Propanone is more soluble in water than 3-hexanone.
From the third pair: The shorter the carbon chain, the more soluble in water it will become.
Butanal is the fourth element on the alkanal family group while hexanal is the sixth compound in the alkanal family group. As such, butanal is more soluble in water than hexanal.
Answer: Option (C) is the correct answer.
Explanation:
A physical substance that occupies space and has mass is called matter. Every matter possesses some chemical and physical properties.
Chemical property is the property which occurs when there is change in chemical composition of matter. Whereas physical property is the property which occurs when there is change in the appearance of matter.
The chemical properties of matter does not depend on temperature, therefore, option (a) is not correct.
Every matter posses some mass therefore, option (b) is also not correct.
It is possible for matter to have similar chemical properties and different physical properties. For example, a very small piece of sodium and a very large piece of sodium will react chemically in the same manner whereas their physical property, in this case is the size, is different. Therefore, option (c) is correct.
Every matter has some chemical and physical properties. Thus, it is not possible that matter can have only physical property and no chemical property. Hence, option (d) is also not correct.
Thus, we can conclude that the statement it is possible for matter to have similar chemical properties and different physical properties is true about matter.
Answer:
3.59x10^21 molecules
Explanation:
1mole of a substance contains 6.02x10^23 molecules.
Therefore, 1mole of C8H18 will also contain 6.02x10^23 molecules
1mole of C8H18 = (12x8) +(18x1) = 96 + 18 = 114g.
1mole (i.e 114g) oh C8H18 contains 6.02x10^23 molecules.
Therefore, 0.68g of C8H18 will contain = (0.68 x 6.02x10^23)/114 = 3.59x10^21 molecules