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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
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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
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Explain the impact that a fall in the world price of oil might have on aggregate supply and gross domestic product (GDP) in an economy.

The first key step to answering this type of IB Economics question is to define the key terms. Aggregate supply is defined as total amount of goods and services that producers of an economy are willing to su...
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Answered by Sofia D. • Economics tutor
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The circle c has equation x^2+ y ^2=1 . The line l has gradient 3 and intercepts the y axis at the point (0, 1). c and l intersect at two points. Find the co-ordinates of these points.

The equation for a line is y(x)=ax+b.Because it intersects the y axis at x=0 at y=1y(x)=b=1a is equal to the gradient of the function so the line is given as y(x)=3x+1In order to get the two intersections we...
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