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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 now: HCL + Zn --> ZnCl2 + H2 .... then we balance this to give: 2HCL + Zn --> ZnCl2 + H2
Secondly, we need to recall the atom economy equation (Mr of desired product / Mr sum of all products x 100) i.e. what you need/everything produced x 100
Desired product Mr i.e. of H2 is: 1 x 2 = 2
All products Mr i.e. ZnCl2 + H2 is: 65 + (2 x 35.5) + (1 x 2) = 138
2/138 x100 =1.45% :)see more
It is difficult to make your personal statement appeal to everyone. However, there can be different threads throughout your statement that subtly tick the box of multiple universities at once.
For example, if one university prefer more academic experience and another university prefers more practical extra-curricular experience, then a thought may be to say what the work experience covered and link this to one of your A-level subjects.... and how this has made you think further in your studies and want to read into this more.
Not only does this make you look like a considered and well-thought out person but also shows you're intrigued to do more (this ticks the academic universities' boxes), and the experience and practical side ticks the boxes of the other universities' requirements.see more
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 the number of chromosomes.
Mitosis there is 1 division. The chromosomes double their DNA/genetic content by making copies of themselves and then after arrangement in a line the chromatids are pulled apart and the cell halves. Each daughter cell now has the same number of chromosomes as the starting parent cell.
Meiosis there are 2 divisions. The first division has the same doubling of DNA as in early mitosis (but just before the first division there is swapping of genetic material, and then there's the 1st division of the pair of chromosomes). The chromosomes then divide again (the 2nd division is similar to the division in mitosis) and therefore there is half the number of chromosomes than the starting cell. This is how gametes (egg/sperm) are made.see more