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Mass of oxygen in balloon = 0.02 x 0.21 Mr (O2) = 16 x 2 = 32 Moles = mass / Mr = (0.02 x 0.21) / 32 = 1.31 x 10^4 moles Or 0.000131 moles
-Atherosclerosis: hardening of blood vessels (specifically those that withstand high blood pressure, ie arteries.)
Firstly, it is important to be familiar with the mark scheme in assuring that you know exactly what is expected of you during this examination. It would also be good to establish where you fit within this...
To form 'le passé composé' (the perfect tense), you need to use an auxiliary verb which is either avoir or être plus the past participle. Avoir is usually used but when the verb is a verb of motion or a r...
A quadratic equation is one that takes the form.. ax2 + bx +c = 0
Factorising an equation like this involves putting the equation into two brackets.
The method varies slightly dep...
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