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What is osmosis?

Osmosis is the passive diffusion of water, which therefore, doesn't require any energy to occur. Typically water will move from an area of high concentration to an area of low concentration across a semi-...

Answered by Matthew W. • Biology tutor

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Name the key differences between Eukaryotic and Prokaryotic cells?

Eukaryotic cells are typically belonging to multicellular organisms, with exceptions of algae and amoebae. These cells always have multiple linear chromosomes (genetic material) and contain a nucleus (hou...

Answered by Matthew W. • Biology tutor

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A hemisphere is placed on top of an upside down cone. The cone has height 9cm and the hemisphere has radius 3cm. The total volume of this composite solid is x cm^3. Calculate the value of x, leaving your answer in terms of π.

To work out the total volume of the composite solid, we need the volumes of both the cone and the hemisphere. GCSE Maths students are expected to know these respective formulae; volume of a sphere = ⁴/₃πr...

Answered by Elliot C. • Maths tutor

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Solve the inequality 6x - 7 + x^2 > 0

Firstly rearrange the quadratic such that thecoefficient of x²is positive (already done in this example) and the quadratic is in the form of ax² +bx + c, then solve for ...

Answered by • Maths tutor

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Potassium Chlorate(VII) decomposes to produce Potassium Chloride and Oxygen. Using the following data calculate the enthalpy change of this decomposition: Enthalpy of formation(KClO4) = -430 kJ mol-1, Enthalpy of formation(KCl) = -440 kJ mol-1

Firstly the equation of this decomposition should be worked out to be the following
KClO₄(s) --> KCl(s) + 2O₂(g)
The enthalpy of formation has been given for both KClO<...

Answered by • Chemistry tutor

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