Top answers

Calculate the concentration in mol/dm3 of 8.0 g of sodium hydroxide (NaOH) in solution with a volume of 50 cm3. (Note Ar(Na) = 23, Ar(O) = 16, Ar(H) = 1)

Calculate Mr(NaOH): Mr(NaOH) = 23 + 16 + 1 = 40, Calculate NaOH moles: n= m/Mr, n= 8.0/40, n= 0.2 moles, Calculate NaOH concentration:(converting from cm 3 to dm 3 by /1000) c= n/v, c= 0.2/(50/1000), c= 4.0 ...
IC
Answered by Imogen C. • Chemistry tutor
10787 Views

i) Factorise x^2 – 7x + 12 ii) Solve x^2 – 7x + 12

i) STEP 1: Make 2 brackets and put an x in each one: (x )(x ) STEP 2: Find 2 numbers when multiplied together make 12 and when added together they make -7 Multiples of 12: 1 x 12 --> 1+12=13 2 x 6 --> ...
HC
Answered by Hashir C. • Maths tutor
4938 Views

Please expand the brackets in the following equation to get a quadratic equation. Then, please show using the quadratic formula that the solutions to the equation are x=3 and x=5. Here is the starting equation: (x-3)(x-5)=0

(X-3)(x-5)=0Use F.O.I.LFirst x multiplied by x gives x 2 outer x multiplied by -5 gives -5xinner x multiplied by -3 gives -3xlast -5x-3 gives +15combining we get x 2 -8x+15=0the quadratic equation ax 2 +bx+c...
JG
Answered by Jacob G. • Maths tutor
4469 Views

‘Transnational corporations (TNCs) only bring advantages to the host country.’ Do you agree with this statement? Justify your decision.

TNCs bring both advantages and disadvantages to host countries, this has a more profound impact in LEDCs, such as Nigeria. Nigeria has approximately 40 TNCs operating within it and one of the biggest is Roya...
AD
Answered by Amber D. • Geography tutor
33577 Views

How are print newspapers constructed to address their target audiences? In your answer you should refer to The Daily Mirror.

Newspapers are constructed to address their target audience through the layout and presentation of the product. Newspapers take into account the preference and demographic of their audience to ensure the pro...
AD
13524 Views