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Describe the trend in reactivity in group 1 alkali metals.

Reactivity increases as you go down the group.
ZQ
Answered by Zaynah Q. • Chemistry tutor
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Solve the equation: 2x^2 + 3x = 14.

This is a quadratic equation, for these types of questions it is often easiest to try and rearrange the formula into the form ax^2 + bx + c = 0, where a, b and c are whole numbers. Therefore the first thing ...
Answered by • Maths tutor
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Describe the difference between phagocytes and lymphocytes (4 Marks)

As this is a 4 mark question you are expected to make 4 points; 1 for each mark This question is asking you to describe differences . You do not need to explain why there are differences. You should compare ...
AL
Answered by Alexander L. • Biology tutor
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Solve: x^2 + x - 12 = 0

x 2 + x - 12 = 0/ x 2 + 4x - 3x - 12 = 0 (split x into two numbers which multiply to equal -12)/ x(x + 4) - 3(x + 4) = 0 (take out x and 3 respectively)/ (x + 4)(x - 3) = 0 (collect terms)/ x = -4, x = 3
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Answered by Maximilian H. • Maths tutor
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What is an ion and how are they formed?

An ion can be an atom or a group of atoms that are charged. This means they can be positively charged or negatively charged.A positive ion is formed when the atom loses electrons. Because electrons have a ne...
MD
Answered by Maisie D. • Chemistry tutor
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