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Why are teachers now saying electrons are in orbitals? I thought they moved around shells?

Unfortunately, every year in school you are told that something from the previous year was not completely true, and had in fact been simplified...one of the major examples of this is orbitals. While the elec...
FM
Answered by Findlay M. • Chemistry tutor
2412 Views

How do i approach a long answer question in order to gain full marks?

My approach is to break down the question. In the case of long answer- questions, examiners want to firstly know that you understand a question before answering. Let's use the following example: Explain how ...
SC
Answered by Silouanos C. • Biology tutor
3939 Views

Use the product rule to differentiate y=2xsinx

The product rule states that y=uv and dy/dx=(u)dv/dx + (v)du/dx. As the equation is in this form we can let u=2x and v=sinx. Therefore du/dx=2 and dv/dx=cosx. Substituting for u and v we get dy/dx=(2x)(cosx)...
GK
Answered by Georgianna K. • Maths tutor
15740 Views

How should I approach an unseen piece of text in an exam?

Firstly, read through the text carefully and try to get your bearings within it. Ask yourself some basic questions to begin: what kind of text is this? Is it prose, poetry, a newspaper article? Who is speaki...
ER
Answered by Emily R. • English tutor
2299 Views

Solve the simultaneous equations: 5x + 3y = 41 and 2x + 3y = 20 Do not use trial and error.

5x + 3y = 41 2) 2x + 3y = 20 Subtract equation 2) from equation 1) to cancel the y's (3y-3y = 0) . Next we subtract the x's (5x - 2x = 3x) and then finally we have 41 - 20 = 21. We now have that 3x = 21 ( re...
DT
Answered by David T. • Maths tutor
20933 Views