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Why dose sodium oxide have a high melting point?

Sodium oxide has a formula of Na 2 O. Since sodium is a metal and oxygen is a non metal, sodium oxide is an ionic species. Sodium will lose an electron to form a cation and oxygen will gain 2 electrons to fo...
Answered by • Chemistry tutor
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Explain the advantages of a reflecting telescope compared to a refracting telescope

Mirrors can be made much larger than lenses (meters compared to around 1m max). Mirrors do not produce chromatic aberration. Mirror glass does not need to be as high quality as lens glass. Mirrors produce le...
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A light wave has a wavelength of 420nm, calculate the energy of this wave in joules.

E = hfE = energyh = planck's constant = 6.63 x 10 -34 f = wave frequency c = fλf = c/λ E = hc/λ c = 3.0 x 10 8 The speed of light which in this case is the speed of the wave.λ = 420 x 10 -9 As 1nm = 1 x 10 -...
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Answered by Nicholas D. • Physics tutor
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Describe the action of insulin for the control of blood glucose concentration

Insulin is made in the beta cells of the pancreas. They act on receptors on the target cells. This controls the uptake of glucose in the target cells by regulating the inclusion of channel proteins on the ta...
Answered by • Biology tutor
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What is the founder effect? How can it influence the genetic profile of a population?

The founder effect occurs when a small number of individuals moves away from the main population, populate a new area, and found a new population. Two notable effects on the genetic profile of a founder popu...
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Answered by Leonie R. • Biology tutor
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