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Why does Iodine have a higher boiling point than chlorine?

Iodine has a larger number of protons and electrons than chlorine, which causes the inter-molecular forces of attraction between iodine molecules to be stronger than those present between chlorine molecules....
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Answered by Jack G. • Chemistry tutor
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Outline three forms of memory

Semantic memory - Memory encoded in terms of meaning. For example a date or fact. Procedural memory - Memory encoded in terms of actions and muscle memory. For example, riding a bike. Episodic Memory - Memor...
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Answered by Brodie N. • Psychology tutor
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Describe what an enzyme is and explain how it works

An enzyme is a biological catalyst which can speed up the rate of chemical reactions, it is also a protein that can be reused. The lock and key model explains how an enzyme works to catalyse reactions. The e...
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Answered by Sadie T. • Biology tutor
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Solve the equation 3sin^2(x) + sin(x) + 8 = 9cos^2(x), -180<X<180. Then find smallest positive solution of 3sin^2(2O-30) + sin(2O-30) + 8 = 9cos^2(2O-30).

Cos^2(x) + sin^2(x) = 1. Therefore Cos^2(x) = 1 - sin^2(x). So equation becomes 3Sin^2(x) + sin(x) + 8 = 9(1 - sin^2(x)). Then becomes 12sin^2(x) + sin(x) - 1This is quadratic equation, solved to (4sin(x) -1...
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Answered by Joshua R. • Maths tutor
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Potassium and Sulfur form an ionic compound, how does this happen?

Potassium has one electron in its outer shell, and Sulfur has two. When forming an ionic compound with one atom of sulfur, two potassium atoms are used. Each potassium atom donates its outermost electron to ...
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Answered by Joshua C. • Chemistry tutor
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