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Why does lithium have a higher melting point than sodium

Melting point decreases going from lithium to sodium because sodium is lower down group one therefore it has a greater number of shells. A greater number of shells means a greater atomic radius - a greater s...
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Answered by Jim O. • Chemistry tutor
15892 Views

What is the bonding in a DNA double helix

Adenine, Guanine, Cytosine, Thymine.A binds to T. “A tea for 2” as there are two hydrogen bonds linking adenine on one DNA strand to thymine on another DNA strandc binds to G. 3 hydrogen bonds between them
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Answered by Jim O. • Biology tutor
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Explain how certain molecules or ions increase the activity of enzymes.

Cofactors and coenzymes bind to an enzyme's allosteric site. This causes interactions between hydrogen bonds in the tertiary structure of the protein to change- altering its structure.The change of structure...
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Answered by Ben C. • Biology tutor
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Discuss the ethical issues that arose in the case of (insert name of case for example Migram's obedience study or Piliavin's subway study.

For a question that starts with discuss you would need to answer with at least three points, four if you have time. You would need to make sure your answer is balanced, therefore giving two strengths of the ...
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Answered by Emma W. • Psychology tutor
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Beschreiben Sie deine Familie

This question is asked a lot at GCSE level, and it can be approached in many different ways. You must think about the family vocabulary that you are familiar with. Think of words for family members, what the...
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Answered by Annabel A. • German tutor
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