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Calcium nitride contains 81.1% by mass of the metal. Calculate the empirical formula of calcium nitride. Show your working.

Ca NPercentage: 81.1% 18.9%Relative atomic mass: 40.1 14Ratio: (81.1/40.1) (18.9/14) 2.02 : 1.35 1.5:1 3:2Empirical formula: Ca 3 N 2
LC
Answered by Laura C. • Chemistry tutor
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f(x) = (x+1)^2 and g(x) = 2(x-1); Show that gf(x) =2x(x+2)

In this question, we are being asked to combine the functions f(x) and g(x). The function gf(x) is 'putting in' the function f(x) into g(x). What we do is substitute whatever f(x) is into the g function like...
MS
Answered by Meera S. • Maths tutor
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What are some hypotheses to explain the Permo-Triassic mass extinction? (when 95% of marine invertebrates and 77% of land species became extinct)

A mass extinction is a large decrease in the number of species over a relatively short period of time (several millions of years). The most likely cause of this species decline is the formation of the superc...
SJ
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What is rationalising a fraction?

So firstly, when we do a rationalisation problem, we are trying to get rid of any surds in the denominator(the bottom part of a fraction). Surds are numbers that have been square rooted and do not equal a wh...
AR
Answered by Aditi R. • Maths tutor
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Outline and explain two ways in which the ethnocentric curriculum may operate in education.

The term ' ethnocentric ' describes an attitude or policy that gives priority to the culture and viewpoint of one particular ethnic group, while disregarding others. The culture that dominates is adopted by ...
SP
Answered by Sarita P. • Sociology tutor
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