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Explain the polarity of both CH3CH2Br and CBr3CBr3.

Both molecules have a C-Br bond, which will be polar due to their difference in electronegativities (bromine is more electronegative than carbon). In CBr3CBr3 the dipoles cancel so the overall molecule is no...
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Answered by David D. • Chemistry tutor
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What is the difference between the preterite and the imperfect tense?

Spanish has two past tenses: preterite and imperfect. Most verbs can be put into either tense, depending upon the meaning. Generally speaking, the preterite is used for actions in the past that are seen as c...
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Answered by Alexandra G. • Spanish tutor
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Show that tan(x) + cot(x) = 2cosec(2x)

For this we have to use trignometric identities, e.g Tan(x)= sin(x)/cos(x), sin 2 (x) + cos 2 (x) = 1, 1/sin(x) = cosec(x) tan(x) + cot(x) = sin(x)/cos(x) + cos(x)/sin(x) = [sin 2 (x) + cos 2 (x)]/sin(x)cos(...
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Answered by Moin B. • Maths tutor
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Describe how standing waves are formed and explain why nodes and antinodes are formed.

Standing waves are produced from the superposition of 2 progressive waves with the same wavelength, travelling in opposite directions. The pattern consists of nodes and antinodes. Nodes are formed from destr...
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Answered by Moin B. • Physics tutor
9609 Views

State 2 features of a system that is in dynamic equilibrium.

In dynamic equilibrium the rate of the foward reaction is equal to the rate of backward reaction. Also the concentration of the products and reactants stay constant.
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Answered by Moin B. • Chemistry tutor
12610 Views