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Work Out (2+11/15 )-(1+1/3)

= (30/15+11/15) - (3/3+1/3) = (41/15)-(4/3) = (41/15)-(20/15) = (21/15) = (7/5)
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Answered by Jack C. • Maths tutor
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Examine the growing need for environmental management at a global scale.

Environmental management, measures or strategies to preserve, protect or prolong the environment’s condition, is becoming increasingly important as the globe is faced with more and more issues that put us an...
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Answered by Elijah S. • Geography tutor
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In terms of electrons, what happens when a calcium atom reacts with chlorine atoms to form calcium chloride?

Calcium chloride in an ionic compound. The calcium atom loses two electrons, and each chlorine atom gains one electron, to form a full outer shell of electrons. The electrostatic force of attraction between ...
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Answered by Yusuf S. • Chemistry tutor
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Devise a simple synthetic route to an amide from a carboxylic acid. Give a mechanism for the final step and explain why the reagents are not added 1:1 in the final step

1st step: SOCl 2 or PCl 3 to form an acyl chloride, which is now significanlty more electrophilic based on leaving gorup abiliity, hence an amine can now attack the acyl chloride to form the amide, where as ...
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Answered by Elliot B. • Chemistry tutor
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A transmitter from a researcher's boat sends a signal to the seabed of waves speed 300m/s and it takes 5 seconds for the signal to return back to the boat. Calculate the depth of the sea there.

distance=speed*time distance=300*5 =1500 1500/2 (as signal travels back and forth)=750m
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Answered by Tani A. • Physics tutor
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