8281 A Level questions

«Все молодые люди должны научиться играть на музыкальном инструменте в школе». Вы согласны с этим мнением? Почему? Почему нет? Напишите сочинение (180–200 слов по-русски).

Изучение музыкального инструмента является одним из лучших методов помогать развитию мозга молодых студентов. Школьные годы играют важную роль как основание взрослой жизни, и если бы больше детей играли в инструменте с молодого возраста, у нас было бы лучше и более передовое общество, для немногих причин.
Во-первых, современное исследование доказывает, что если студент изучает играть в инструменте или занимает каким-то внеклассном занятием, то он часто любопытнее и трудолюбивее в школьном классе. Человеческому мозгу нужна интеллектуальная еда, и если бы в молодости мы ввели инициативы, чтобы предлагать людям учение музыку, увиделись бы сильное увеличение академические оценки вообще.
Во-вторых, …. (essay would continue with one further point, a minor counter point and a conclusion).
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Reuben W.

11 hours ago

Answered by Reuben, an A Level tutor with MyTutor

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Describe the four stages of mitosis

There are four stages of mitosis: prophase, metaphase, anaphase and telophase.1) Prophase: chromatin into chromosomes, the nuclear envelope break down, chromosomes attach to spindle fibres by their centromeres 2) Metaphase: chromosomes line up along the metaphase plate (centre of the cell) 3) Anaphase: sister chromatids are pulled to opposite poles of the cell 4) Telophase: nuclear envelope reforms, chromosomes unfold into chromatin, cytokinesis can begin The order of the stages of mitosis can be remembered using the mnemonic PMAT.
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Jessica C.

15 hours ago

Answered by Jessica, an A Level tutor with MyTutor

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(40 marks) How should I structure my answer to the essay “Does natural law provide a helpful method of moral decision-making?”

1) Begin with an introduction. What is natural law? (An absolutist theory that argues that nature provides unambiguous answers to moral dilemmas) who initially proposed it? (Aquinas, 13th century theologian) Make sure you signpost your view on the matter (I.e. Yes it is a strong method of decision-making for a variety of reasons)
2) With your line of argument set out, explain how natural law works and how it provides its moral guidance (primary precepts, real vs apparent good, “telos” etc...) Think of the strengths and weaknesses of the theory, critically analyse these to strengthen your view (due to it being an objective theory, natural law is practical and easy to follow when making moral decisions) What would the opposing view have as a response to natural law? Use scholars to back up as many arguments as possible. (Aquinas is naïve in believing that humans have a “natural inclination to do good” - Augustine argued that humans are corrupted by “Original Sin” this undermines Aquinas’ theory) Counter the response to further strengthen your view and argument. (There is no empirical evidence for Augustine’s view on human nature) Always refers back to the question and make sure you are indeed answering it.
3) Include a conclusion or judgement, which summarises your argument and makes it clear that you answered the question. Your conclusion should logically follow through, just from reading the essay and should be the same as what you expressed in your introduction.

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Henri L.

1 day ago

Answered by Henri, who has applied to tutor A Level with MyTutor

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Describe the structure of the human heart and how the blood is pumped by the heart.

The heart can be described as a double pump system. It consists of 4 main chambers (sections) - 2 atria and 2 ventricles split into left and right. The atria have relatively thin walls whereas the ventricles have thicker walls, the left ventricle is more muscular than the right. The easiest way to look at the blood flow of the heart is to start from the right side of the heart going through to the left. The blood flows into the right atrium via the superior and inferior vena cava, the atrium passively fills up whilst the tricuspid valve is closed. The tricuspid valve opens and the right atria contracts pushing the blood into the right ventricle. The tricuspid valve closes again, with the pulmonary valve closed the right ventricle contracts increasing pressure within the ventricle, then the pulmonary valve opens to allow the blood to be pumped to the lungs via the pulmonary arteries. Gaseous exchange takes place in the lungs and oxygenated blood returns to the left side of the heart via the pulmonary veins. Similarly to the right hand side the left atrium fills with blood whilst the bicuspid (mitral) valve is closed, the atria contracts to squeeze the blood into the left ventricle. The left ventricle contracts with both valves closed to increase pressure and then the aortic valve opens to allow the blood to flow through the body via the aorta and great vessels.
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Woojin C.

2 days ago

Answered by Woojin, an A Level tutor with MyTutor

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How does ATP get produced in oxidative phosphorylation

NADH and FADH both carry hydrogen ions (protons) and electrons to the inner mitochondrial membrane. Here the coenzymes release protons and electrons into the electron transport chain, becoming NAD and FAD. The electrons move from intermembrane protein to intermembrane protein, decreasing in energy as they travel along. The energy produced by this is then used to pump protons into the intermembrane space. The protons then diffuse down their concentration gradient through ATPsynthase to convert ADP and inorganic phosphate into ATP.
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Jeffrey T.

2 days ago

Answered by Jeffrey, an A Level tutor with MyTutor

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Integrate the natural logarithm of x (ln x) with respect to x

In order to integrate ln x you have to use integration by parts, even though it appears there is only one term to be integrated. We get around this by instead writing it as (ln x)(1), where we treat the 1 as another function of x. Now we can apply the integration by parts rule by setting u = ln x and dv/dx = 1.
Integration by parts states that the integral of u(dv/dx) = uv - the integral of v(du/dx). Integrating v(du/dx) is easy because we know that d/dx(ln x) = 1/x, and the integral of 1 is x, so the two cancel and we are left with integrating 1 again. Once integrated fully, the answer will be x[(ln x) - 1] (+c) where c is the constant of integration.
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Archie D.

3 days ago

Answered by Archie, who tutored A Level with MyTutor

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Find the constant term in the expression (x^2-1/x)^9

This problem uses the binomial expansion formula: (x+y)n= k=0Zn nCk xk yn-k.But lets try to understand where this formula comes from by doing the problem without it to start of with.We have the expression:(x2-1/x)9=(x2-x-1)9=(x2-x-1)(x2-x-1)(x2-x-1)(x2-x-1)(x2-x-1)(x2-x-1)(x2-x-1)(x2-x-1)(x2-x-1)If we wanted to compute all the terms in this expression, we would have to add up each different combination of multiplying one number from each of the nine brackets. However we are only looking for the constant term, aka where the x's cancel out. Since we are multiplying x2s and x-1s, by adding exponents we can find that to be when we choose 3 x2s and 6 x-1s. But there are many ways to choose 3 x2s and 6 x-1s from the 9 brackets, so we need to add them up to get the final result.Fortunately, there is an easy way to do this, using Pascal's triangle. If we make a Pascal's triangle down to the 9th row and we take the 3rd number on that row, we will find out coefficient. We can also calculate this value quicker by using the formula n!/k!n! where n is the power (9) and k is the number of times we choose one of the terms in the bracket.So now lets see how that brings us back to our binomial expansion formula.We can now see that xk yn-k just refers to the value we get if we choose k x's.nCk is the coefficient that we found from Pascal's Triangle to account for all the possible ways to get k x's.And finally the formula is a sum of this equation for all possible k's so that we find all the terms of the expression!
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Vincent Y.

4 days ago

Answered by Vincent, an A Level tutor with MyTutor

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What is the difference between primary socialisation and secondary socialisation? (4 marks)

Primary socialisation is the process through which a child learns the norms, values, and appropriate behaviours for an individual within wider society. This usually takes place within the family, and can include siblings, grandparents or family friends. This usually only happens once in an individual's life.Secondary socialisation, however, takes place in institutions and organisations which are smaller, and may have slightly different values to the wider society or culture. For example, a new member of a workplace must learn the norms and values of that particular company. This can happen several times over the course of a person's life.
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Georgia C.

4 days ago

Answered by Georgia, an A Level tutor with MyTutor

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Bethan prepared some ethoxyethane (line 6) by reacting ethanol with concentrated sulfuric acid. She used 69g of ethanol (Mr=46) and obtained a 45% yield of ethoxyethane (Mr=74). Calculate the mass of ethoxyethane obtained.

1. Equation from line 6 is: 2 (ethanol) -------> 1 (ethoxyethane)
2. The ratio of reaction is 2:1. This is the ratio of moles not mass, i.e., 2 moles of ethanol give 1 mole of ethoxyethane.
3. We need to know how many moles of ethanol are used. Recall the [ Mass = Mr . Mole ] equation * Get 1.5 moles of ethanol
4. To be consistent with the ratio, we need 0.75 moles of ethoxyethane.
5. Use [ Mass = Mr . Mole ] to find mass of product. * This will be 55.5 g
6. Explain that things go wrong in real life experiments and processes and the concept of yield. Bethan has 45% of what the product would be in an ideal world. * Final Solution = 24.98 g
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Shreyasi D.

4 days ago

Answered by Shreyasi, who has applied to tutor A Level with MyTutor

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Differentiate: tan(2x) cos(x)

1. Explain the product rule: d/dx ( f(x) . g(x) ) = f'(x).g(x) = g'(x) . f (x)
2. Briefly run through trigonometric derivatives.* cos (x) differentiates to: -sin(x)* tan (x) differentiates to: sec^2 (x)
3. Briefly run through the chain rule.* tan (2x) differentiates to: 2 sec^2 (2x)
4. Bring everything together to get the two terms for the answer
* First term of the solution is: [ 2 sec^2 (2x) . cos (x) ]* Second term of the solution is: [ - sin (x) . tan (2x) ]
* Final Solution is: [ 2 sec^2 (2x) . cos (x) ] + [ - sin (x) . tan (2x) ]
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Shreyasi D.

4 days ago

Answered by Shreyasi, who has applied to tutor A Level with MyTutor

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