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a) Describe the nature of ionic bonding. b) State the electron configuration of the Ca (II) ion. c) Outlie why solid calcium is a good conductor of electricity.

a) Ionic bonding is the electrostatic attraction between oppositely charged ions (+ and -). [1]b) 1s 2 2s 2 2p 6 3s 2 3p 6 [1]c) Metallic bonding occurs through delocalized electrons in solid calcium. Those ...
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Answered by Hristo S. • Chemistry tutor
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Where does photosynthesis take place?

It occurs in plant cells, in the chloroplasts, found in the mesophyll layer. Chloroplasts contain chlorophyll necessary to absorb light.
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Answered by Lorenzo R. • Biology tutor
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Let f(x) = px^2 + qx - 4p, where p is different than 0. Showing your working, find the number of roots for f(x) = 0.

Δ = b 2 - 4ac = q 2 - 4p (-4p) = q 2 + 16p 2 p different than 0 => 16p 2 greater than 0 only q 2 greater or equal to 0q 2 + 16p 2 > 0 => f has two ( 2 ) roots
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Answered by Hristo S. • Maths tutor
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Explain the roles of specific enzymes in prokaryote DNA replication. [7 marks]

DNA replication is the same in eukaryotes and prokaryotes; the question just emphasizes that the process depends on enzymes and their functions need to be explained. DNA gyrase (or topoisomerase II) relieves...
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Answered by Hristo S. • Biology tutor
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Why do people say assault when it can mean assault and battery?

Firstly, we are dealing here with offences against the person. Assault actually splits into 2 categories - a common assault and a battery. These both come under common law. This is important, because it mean...
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Answered by Emily W. • Law tutor
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