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Calculate the atom economy for making hydrogen when zinc is reacted with HCL?

So, there are two parts to this question. Firstly, you need to decode the words in the question and transform this into an equation. From chemical knowledge, you know: acid + metal --> salt + hydrogen So ...
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Answered by Pooja D. • Chemistry tutor
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What is the difference between mitosis and meiosis?

I always remember mitosis as the process that leads to "genetically identical clones" and meiosis being the process that does not lead to clones but is the process that produces a cell with half th...
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Answered by Pooja D. • Biology tutor
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Why does reactivity increase as you go down Group 1 metals?

An atom is made in such a way that the nucleus with the positive charges (protons) is in the centre and the negative charge (electrons) are arranged in shells around it. All group 1 metals have one electron ...
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Calculate the value of 2^(–3) as a fraction in its simplest form.

To calculate the value of 2 -3 first we know that a negative exponent is equivalent to the inverse of the same number with a positive exponent. Therefore 2 -3 = 1/2 3 , the next step is to calculate 2 3 , 2 ...
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Answered by Joseff S. • Maths tutor
250389 Views

Calculate the largest share when £400 is shared in the ratio 1 : 2 : 5.

To calculate the largest share, first we need to find out how much each part that makes up a share is worth. To find out how much the smallest part is (i.e 1 part), we divide the value £400 by the sum of the...
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Answered by Joseff S. • Maths tutor
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