Top answers

What is the general rule for the molecular formula for alkanes? Therefore what is the formula for an alkane with 7 carbons, and what is it called?

C n H 2n+2 C 7 H 16 Heptane
KB
Answered by Kd B. • Chemistry tutor
2538 Views

"I just don't really understand word classes"

There are 7 main word classes, so let’s focus on those for now. They are: Nouns, Pronouns, Verbs, Adverbs, Adjectives, Prepositions and Determiners. You can work out which class a word belongs to using both ...
CR
2782 Views

Rearrange the following equation to make T the subject: (3T+A)/2 = B

T=(2B-A)/3
AB
Answered by Alice B. • Maths tutor
4239 Views

How do I talk about my hobbies in my essays?

You want to show the examiner that you have a good command of grammar and a varied vocabulary. So I would suggest including at least three hobbies and using a different verb each time you talk about a hobby....
MH
Answered by Michaela H. • Russian tutor
2935 Views

Integrate $$\int xe^x \mathop{\mathrm{d}x}$$.

We use integration by parts. Set $u = x$ and $dv/dx = e^x$. This leads to $du/dx = 1$, and $v = e^x$. Then:\begin{align*}\int xe^x \mathop{\mathrm{d}x} &= xe^x - \int e^x \mathop{\mathrm{d}x}\&= xe^x...
CN
Answered by Christopher N. • Maths tutor
4347 Views