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Complete the gaps in this sentence: In simple distillation, the mixture is heated to make the liquid ______. The vapour is then cooled to make it _______.

First answer: evaporateSecond answer: solidify
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Answered by Sammy B. • Chemistry tutor
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Prove that 2^(80)+2^(n+1)+2^n is divisible by 7 for n belongs to the natural number.

We will prove that 2^(n+2)+2^(n+1)+2^n is divisible by 7 using formula to multiply powers with the same base:a^(b) * a^(c) = a^(b+c)Now looking at our expression we can write:2^(n+2) + 2^(n+1) + 2^n = 2^n * ...
Answered by • Maths tutor
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Explain why rate of reaction increases when temperature increases.

the reactant particles have more energy, so they move quicker, so there are more frequent successful collisions
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Answered by Israel H. • Chemistry tutor
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Name three non-specific human defences against diseases

skin - acts as a physical barrier; mucus and ciliated cells on mucous membrane in trachea - catch pathogens and sweep them up out of lungs; stomach acid - kills bacteria
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Answered by Israel H. • Biology tutor
2701 Views

What is the difference between the preterite tense and the imperfect tense?

The preterite tense is used for one-off or completed actions in the past. For example: Visitó España el año pasado. / She visited Spain last year. The imperfect tense is used for repeated or continuous actio...
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Answered by Kate N. • Spanish tutor
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