Answer: The correct answer is Orbital notation shows the spin of the electrons.
Explanation:
Advantages of Orbital notation :
Where as spin of the electrons is not conveyed by the electron dot structure.
Hence, the corrects answer is : Orbital notation shows the spin of the electrons.
Answer:
The same wavelength
Explanation:
The two sound waves shown in the diagram has the same wavelength as clearly shown.
a) 8
40*20%
=40*20/100
=800/100
=8
The atomic weight of the unknown element, which is approximately 20% less than calcium (40 amu), is estimated to be 32 amu.
The atomic weight of an unknown element is said to be approximately 20% less than that of calcium, which has an atomic weight of 40 atomic mass units (amu). To calculate the approximate atomic weight of the unknown element, take 20% of 40 (which is 8) and subtract it from 40. The result is 32 amu (40 - 8 = 32), so the correct answer is (c) 32.
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Answer: Yes.
Explanation:
A white dwarf is the last "stage" for low- and medium-mass stars, it is what stars become after they have exhausted their fuel. They are verydense stars as they are the remaining core of stars. They're typically the size of a regular planet. White dwarves are not the type of stars we usually think of, but they are still stars.
FALSE
When a catalyst is added to a system the equilibrium concentration remains unchanged. A catalyst increases the activation energy of the forward reaction. The correct option is 2.
A substance which increases the rate of a reaction without itself undergoing any permanent change chemically or quantitatively is defined as the catalyst and the phenomenon is known as the catalysis. It is believed that a catalyst usually participates in the chemical reaction and it speeds up.
In short, the catalyst lowers the energy barrier and thereby provides a different path of lower activation energy for the reaction so that the rate of the reaction increases.
A catalyst speeds up both the forward and backward reactions to the same extent and does not alter equilibrium constant. Thus it speeds up the attainment of equilibrium faster.
Thus the correct option is 2.
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