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What are moles in Chemistry?

The moles is the amount of a substance that we are measuring, its like measuring how many coins I have in my pocket, but instead how many atoms of an element we have. We use the equation moles=mass/RMM to wo...
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Answered by Lucy P. • Chemistry tutor
4765 Views

Write 36% as a fraction in its simplest terms.

36%= 36/100 Divide it by 2, the answer will be 18/50. It can then be divide by 2 again and getting to the answer of 9/25.
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Answered by Li Ying O. • Maths tutor
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Find the value of X and Y if X^2 + Y^2 = 13 and 2X + Y = 1

Firstly, since only one equation is linear, substitution must be used. This will allow us to make a quadratic equation with one variable and solve for X and Y. To do this, I will make Y the subject of the fo...
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Answered by Alexis S. • Maths tutor
7119 Views

Should I use the imperfect or perfect tense in this sentence?

The perfect tense refers to a completed event in the past where the effect of the event may still continue in the present. Whereas, the imperfect tense describes ongoing past events without reference to a ti...
JP
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How do you know when to use the subjunctive?

The thing to always bear in mind about the subjunctive is that it’s a ‘mood’, and therefore is used to express a certain emotion or tone of voice. If the sentence you’re trying to write or translate has an i...
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Answered by Joanna H. • French tutor
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