7.1 Ammonia ionises in water to form a basic solution according to the following balanced equation: 7.1.1 Is ammonia a WEAK or a STRONG base? Give a reason for the answer. (2)7.1.2 Write down the conjugate acid of NH3(g). (1)7.1.3 Identify ONE substance in this reaction that can behave as an ampholyte in some reactions. … Read more
A very small graphite-coated sphere P is rubbed with a cloth. It is found that the sphere acquires a charge of + 0,5 μC. 7.1 Calculate the number of electrons removed from sphere P during the charging process. (3) Now the charged sphere P is suspended from a light, inextensible string. Another sphere, R, with … Read more
7.1 Read the poem carefully and then answer the questions which follow. The number of marks allocated to each question serves as a guide to the expected length of your answer. 7.1.1 Complete the following sentence by using the words in the list below. Write only the word next to the question number (7.1.1(a)–7.1.1(c)) in … Read more
Two learners investigate the effect of the slit width on the degree of diffraction. They use a green light with a wavelength 520 nm. They set up an experiment, as shown below, and measure the position of the first dark line from the centre of the bright, central band when changing the slit width. The … Read more