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Why is the first ionisation energy of Potassium less than Sodium?

The first ionisation energy is the energy required to move one mole of electrons from one mole of atoms in its gaseous state. The outer electron in Potassium is in the 4s orbital, which is further away from ...
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Answered by Abida R. • Chemistry tutor
33580 Views

Calculate the mass, in grams, of CH3CH2NH2 produced from 32.9 g of CH3CH2I reacting with an excess of NH3 assuming a 70.0% yield.

To tackle any question like this, you should first write out the reaction formula (I would do this on the whiteboard). You can see from this that the ratio between the reactant and product is 1:1. You can al...
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Answered by Rob B. • Chemistry tutor
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Electrons are accelerated through a potential difference of 300 V. What is their final de Broglie wavelength?

The kinetic energy of the electron will be equal to the energy what the electric field gives to it.1/2 m v 2 =V QFrom thisv=sqrt(2 V Q/m) De Broglie wavelength:lambda=h/p=h/(mv) We know that h is the planck ...
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Answered by Csaba B. • Physics tutor
9950 Views

Calculate the pH of the following solutions: 0.002 mol/dm^-3 KOH

pH by definition is given as -log 10 (c H+ ) or log 10 (1/c H+ ), where c H+ is the concentration of the H+ ions in the solution.Similarly, pOH= -log 10 (c OH- ) pH + pOH= 14KOH is basic so we can calculate ...
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Answered by Csaba B. • Chemistry tutor
11074 Views

Describe the process of DNA replication

During DNA replication, the enzyme DNA helicase separates the two strands by breaking the hydrogen bonds between bases of each strand. Activated DNA nucleotides hydrogen bond with the exposed complementary b...
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Answered by Dani H. • Biology tutor
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