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In a stack of CDs, there are 3 types: Rock, Pop and Jazz. There are 2 Rock CDs, x Pop CDs, and (2x+5) Jazz CDs. A CD is chosen at random. If the probability it is Rock is 1/20, work out the probability it is Jazz.

Number of Rock CDs = 2Total Number of CDs = 2 + x + (2x+5) = 3x + 7Probability of Rock CD = 2/(3x + 7) = 1/202/(3x + 7) = 1/2040 = 3x + 7x = 11Number of Jazz CDs = 2x + 5 = 27Total Number of CDs = 3x + 7 = 4...
VL
Answered by Vinh L. • Maths tutor
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What are the main differences in composition of blood taken from an artery to blood taken from a vein?

An artery which principally supplies cells metabolism would contain more of the 'fuels' required such as oxygen and glucose. A vein typically carries blood containing the waste products of metabolism and the...
TW
Answered by Tegen W. • Biology tutor
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What is the Haber process? What are the optimal conditions for the reaction and why are they not used in practice?

The Haber process is a reaction of burning Nitrogen and Hydrogen to make NH3.The formula is 2N2 + 3H2 - 2 NH3. The reaction is reversible.The forward reaction is exothermic so when the temperature is increas...
IM
Answered by Iona M. • Chemistry tutor
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Describe three possible structures of the allotropes of carbon

1.Graphite is made up of multiple flat layers of carbon, where the layers are not covalently bonded together. Three covalent bonds hold the atoms in each layer together, forming a repeating hexagonal ring st...
JC
Answered by James C. • Chemistry tutor
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Predict the products of electrolysis of molten calcium chloride and explain which ions are at each electrode

Electrolysis is a process in which electrical energy, from a direct current (dc) supply, breaks down electrolytes. the free moving ions in electrolytes are attracted to the oppositely charged electrodes whic...
YM
Answered by Yasmeen M. • Chemistry tutor
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