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What is activation energy?

This is the minimum amount of energy reacting particles must have to undergo a chemical reaction.
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Answered by Suzy A. • Chemistry tutor
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Why is the overuse of antibiotics dangerous?

It can lead to an increase in the population size of strains of antibiotic-resistant bacteria, such as MRSA
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Answered by Suzy A. • Biology tutor
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Define the term ultrasound wave

An ultrasound wave is a soundwave with a frequency higher than 20,000 Hz
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Answered by Reni A. • Physics tutor
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Solve the inequality 3x ≤ 4x+5

So I would begin by minusing 5 from both sides and that will give you 3x - 5 ≤ 4x. Then we want to gather our x's onto one side, so I would '-3x' from both sides which leaves you with - 5 ≤ 4x - 3 x, so you ...
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Answered by Reni A. • Maths tutor
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Do the following vector equations intersect? l = (1 + μ)i + (2 - μ)j + (2μ - 5)k, and m = 2λi + 3j + (2 + λ)k.

Firstly we must appreciate that if there is an intersection between l and m, this means that there exists a point that occurs on both lines. Therefore if there is an intersection, it is when l = m .So we mus...
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Answered by Harry D. • Maths tutor
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