Science Teacher

Fact about a system in equilibrium

for a reaction to attain equilibrium;
-It must be in a closed system i.e no energy should be lost through the system or gained into the system
-for the above to be achieved the temperature, pressure and concentration of the system remains constant.
-it must be a reversible reaction (an irreversible reaction cannot attain equilibrium)
-the Gibbs free energy i.e the energy available to do work must be zero, ∆G = 0
-the rate of forward reaction must be equal to backward reaction

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Today's chemistry

In which of the following alternatives was it proved that H20 and H202 obey the law of multiple proportion

A. The hydrogen are combined In a simple ratio of 1:2
B. The hydrogen are combined in a simple ratio of 2:1
C. The oxygen atoms are combined in a simple ratio of 1:2
D. The oxygen atoms are combined in a simple ratio of 2:1
E. None of the above

Today's Biology

The three (3) domains of life include;

1. Domain bacteria
2. Domain archae
3. Domain eukarya

All the other six kingdoms are grouped under this thre Domains

1. Under bacteria we have : Eubacteria (true bacteria)

2. Under Archae we have : Archaebacteria

3. Under eukarya falls the remaining four

i Kingdom protista
ii kingdom fungi
iii Kingdom plantae
iv Kingdom animalia

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The maximum number of electrons, present in an orbit whose angular momentum is 2h/pie ?

A. 2
B. 8
C. 18
D. 32

Solution

According to bohr atomic model
Angular momentum of electron equals = nh/ £

Here I'll use the sign £ to mean pie

That is,

mvr = nh/£

But in the question we were given 2h/£

Comparing nh/£ and 2h/£ , we have ;

nh/£ = 2h/£

From here n = 4£h /£h
Then n = 4

You've to understand that the number of electrons in an orbit or main energy level is given as : 2n²
Where n = principal quantum number
From the question n equals 4

Then the number of electrons in the main energy level or orbit is

2n²=2(4)² = 32

Therefore , the max. No of electrons will be 32 electrons
Option (D) ✅️🔰

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