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Balance the following equation showing complete combustion of a hydrocarbon: C3H8 + O2 --> CO2 +H2O

First, we can look at the number of hydrogens on either side. The equation shows 8 hydrogen atoms on the left hand side (in C3H8) whereas on the right hand side, we have 2 hydrogen atoms (in H2O). So we need...
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Answered by Tahmina A. • Chemistry tutor
33010 Views

What idiomatic expressions can be useful in my controlled assessment?

'De todas maneras' is commonly used by native speakers, and most useful since you can always use it when you want to talk about something new. Other noteworthy expressions include: "Tonto/a de remate&qu...
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Answered by Zac L. • Spanish tutor
3475 Views

How do you conjugate the verb 'jouer' in the 'je' form in the present tense?

Like other regular verbs that end in 'er', all you need to do is take off the 'r', which leaves you with 'joue'. 'I play' would be translated as 'je joue' in French.
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Answered by Zac L. • French tutor
4924 Views

How do I know when to use imperfect or perfect tense in French?

Generally speaking, the imperfect describes: Ongoing events which haven't been completed yet E.g. J’étais à l’école – I was at school. Repeated actions – non-specific number of times E.g. Je faisais le tenni...
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Answered by Eva J. • French tutor
3154 Views

Pythagoras: If you have a right angled triangle PQR, and length PQ=5cm, length QR=8cm (which is the longest length), then calculate length PR to two decimal places.

Pythagoras' theorem is: a^2+b^2=c^2 (a=short side, b=short side, c=longest side/hypotenuse, ^=squared). Now applying that to this question would mean that a=PQ, b=PR and c=QR. So we can use the figures given...
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Answered by Pree S. • Maths tutor
12703 Views