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Il ruolo della tecnologia nelle relazioni interpersonali.

Nell'ultimo secolo il modo di comunicare è profondamente cambiato. Un tempo l'unico modo per tenersi in contatto era inviare delle lettere dovendo aspettare giorni prima di ricevere una risposta. Ora la t...

Answered by Enrica L. • Italian tutor

1653 Views

How should I structure an A-Level answer to ensure I reach my desired mark bands?

Both OCR and AQA structure their mark schemes around five Assessment Objectives (AOs). Some portions of your examination will require showing knowledge of all five, others only a selection. In short, they...

Answered by Ben W. • English tutor

1810 Views

Calculate the atom economy of the following equation, assuming that KNO3 is the desired product. KOH + HNO3 ---> KNO3 + H2O (Mr of reactants and products, KOH - 56.1, HNO3 - 63.0, KNO3 - 101.1, H2O - 18.0)

Answer: 84.9% The equation for calculating the atom economy is = (Mr of desired product / total Mr of products) x 100 or = (Mr of desired product / total Mr of reactants) x 100 as the total Mr of the prod...

Answered by Manon S. • Chemistry tutor

4556 Views

Express (16x^2 + 4x^3)/(x^3 + 2x^2 - 8x) + 12x/(x-2) as one fraction in its simplest form.

Answer: 16x/(x - 2)

Start with the numerator of the first fraction, 16x² + 4x³ , take a factor of 4x² out to get 4x²(4 + x). Then look at the denominator...

Answered by Manon S. • Maths tutor

3367 Views

In a bag of 25 coloured balls, 7 are orange, 6 are yellow and the rest are green. Laura picks out a ball and records its colour but doesn't return it to the bag, she then repeats this twice more. What is the probability of Laura getting 3 yellow balls?

Answer: 1/115

The easiest way to solve this problem is to draw part of a tree diagram to see the probabilites of each colour being picked each time Laura pulls a ball out of the bag (a full diagram...

Answered by Manon S. • Maths tutor

3042 Views