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Explain how the physical properties of water enable organisms to survive over a range of temperatures.

Water has a very high specific heat capacity due to the collective forces of the many hydrogen bonds. A lot of energy goes into breaking these bonds rather than raising the temperature of the water, hence...

Answered by Arunima B. Biology tutor
19348 Views

What are the 2 methods used to manufacture ethanol? What are the advantages and disadvantages of both?

The hydration of ethene: Ethene and steam are passed over a catalyst - concentrated phosphoric acid (H3PO4) - at 300OC and 60-70 atmospheres. This process is fast, continu...

Answered by James P. Chemistry tutor
7111 Views

How is the the small intestine adapted for absorption?

The Ileum is long (up to 7m!) and has a very high surface area due to the presence of many villi and microvilli. A single villus is made up of many cells, each with lots ...

Answered by James P. Biology tutor
20860 Views

A stationary point of inflection implies a second derivative of 0, does this work the other way around?

No, and we may take a counterexample to see why. If y=x^5+5/3x^4, dy/dx=5x^4+20/3x^3, d2y/dx2=20x^3+20x*2=20x^2(x+1). Setting this to 0 will give us the candidates for a POI, but not all these numbers wil...

Answered by Toby R. Maths tutor
2875 Views

Why is adolescence a critical period in human development?

The period between childhood and adulthood is a time of great transition and turbulence with regards to changing bodies, close relationships, and expectations. It is one of the most rapid phases of develo...

Answered by Chloe K. Psychology tutor
1604 Views

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