The diagram below shows the graphs of f(x)=-x2 + 2x+15 and g(x)=-3x+k. Graph f cuts the x-axis at A(-3 ; 0) and B(5 ; 0), the y-axis at C and has a turning point at D. Graph g cuts the x-axis at B and the y-axis at C. E is a point on g such … Read more
The diagram below represents a transverse wave produced by source A. 6.1 Define the term amplitude of a wave. (2) 6.2 Write down the amplitude, in metres, of this wave. (1) 6.3 Determine the period of this wave. (1) 6.4 Calculate the: 6.4.1 Speed of the wave if the wavelength is 0,8 m (5) 6.4.2 … Read more
6.1 Potassium permanganate, KMnO4, burns with a bright flame when a few drops of glycerine are added to it. The incomplete equation for the reaction is: 6.1.1 Define the term molar mass. (2) 6.1.2 The composition of glycerine is as follows: 39,13% carbon; 8,7% hydrogen; 52,17% oxygen Determine the EMPIRICAL formula of glycerine. Show ALL … Read more
A light ray is incident on a glass prism. The angle of incidence is 38°, as shown below.The refractive index of glass is 1,5 and that of air is 1. 6.1 Define the term angle of refraction. (2) 6.2 Calculate the angle of refraction inside the glass prism. (3) 6.3 Redraw the glass prism in … Read more
A pole, 8 m tall, is held in a vertical position by two steel cables of equal length. In thesketch, PQ is the pole and PS and PR are the steel cables. The angle of elevation of the topof the pole from the anchor points R and S is 60o in both cases. 6.1 Determine … Read more
Dinitrogen tetraoxide, N2O4(g), decomposes to nitrogen dioxide, NO2(g), in a sealed syringe of volume 2 dm3. The mixture reaches equilibrium at 325 °C according to the following balanced equation: When equilibrium is reached, it is observed that the colour of the gas in the syringe is brown. 6.1 State Le Chatelier’s principle. (2) 6.2 The … Read more