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An excess of Lead (II) oxide reacts with 175cm3 of 1.5 mol dm3 nitric acid. Calculate the maximum quantity of lead that can be obtained from this reaction.

Write the equation: PbO + HNO 3 --> PbNO 3 + H 2 O. Balance the equation: there are two moles of hydrogen (in water) on the right. To balance the hydrogens, two moles of hydrogen are needed on the left to...
HS
Answered by Hibba S. • Chemistry tutor
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What are the advantages of making voting compulsory in the UK? (10 Marks)

As evidenced in liberal democracies where compulsory voting is a federal law, this has had a positive impact on political participation and has been proposed by campaigners such as Graham Allen MP so long as...
HD
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Using Newton's law of universal gravitation, show that T^2 is proportional to r^3 (where T is the orbital period of a planet around a star, and r is the distance between them).

Newton's law of gravitation is: F G =(GMm)/(r 2 ).First of all, it's a good idea to draw a diagram of the planet and star, labelling the directions of the centripetal force and and the planet's velocity in p...
JB
Answered by Jake B. • Physics tutor
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Write 144 as a product of its prime factors

To do this, we draw a prime factor tree (whiteboard). The easiest way is to keep dividing by 2 (which is a prime number) until we get an odd number. 144/2 = 72 and 72/2 = 36 and 36/2 = 18 and 18/2 = 9 which ...
ES
Answered by Ewan S. • Maths tutor
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What causes the aggregate demand curve to shift?

Aggregate demand is the total demand for all goods and services in an economy; it is essentially gross domestic product. Its components are consumption, investment, government spending and net exports (expor...
JW
Answered by James W. • Economics tutor
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