Answer:
The heavier isotope is 48.2 % (option d)
Explanation:
Step 1: Data given
Atomic weight of silver = 107.868 amu
Isotopes of silver:
107Ag = 106.904 amu
109Ag = 108.905 amu
Step 2: Calculate the percentages
107.868 = 106.904 * x + 108.905 *y
x+y = 1 ⇒ x = 1 - y
107.868 = 106.904 (1 - y) + 108.905*y
107.868 = 106.904 - 106.904y + 108.905y
0.964 = 2.001y
y = 0.4818
x = 1 - 0.4818 = 0.5182
Percentage 109Ag = 48.18 %
Percentage 107Ag = 51.82 %
The heavier isotope is 109Ag. Its percentage is 48.18 ≈ 48.2 %
Answer:
Radiation
Explanation:
Thermal energy (heat) can be transferred between objects as long as there is a temperature difference between them. However, there needs to be some kind of medium transferring it. There are basically three ways in which the energy is transferred:
1. Conduction - transfer via the direct contact
2. Convection - transfer via the circular movement of fluids or air caused by hotter layers moving upward and colder downwards.
3. Radiation - transfer via the waves from the invisible spectrum of electromagnetic radiation ( ultra-violet, infra-red...)
Frequency is not a type of energy transfer, but a number of times something is occurring in one second. When we say that the frequency is 200Hz it means that something is happening at a rate of 200 times in a second. It's most often used in describing oscillations.
Answer:
A) Ethanoic acid and ammonium chloride.
Explanation:
Amides go through acid hydrolysis to produce carboxylic acid and ammonia by heating in aqueous acid. The acid hydrolysis reaction is produced through the <u>nucleophilic addition of water to the protonated amide</u>, then comes the transference of a proton from the oxygen to the nitrogen to make nitrogen a better leaving group, and finally, the subsequent elimination (see attachment).
In this case, the products formed with the reaction of ethanamide and aqueous HCl will be <u>ethanoic acid and ammonium chloride</u>.
Answer:
Option C, Smut
Explanation:
Corn smut is a condition in which mushroom-like tumors or galls appear on different part of the plant. This is caused by fungus Ustilago zeae. Corn smut is edible and appears grayish white with spony texture in the early stages of the infection promptly found on corn ear or tassel.
Hence, option C is correct