8.1 Consider the diagram below that shows liquid water evaporating to form water vapour. Use chemical formulae to represent the process in the diagram above and indicate the phases of the substance undergoing this process. (2) 8.2 Give THREE separation methods that can be used to reverse a physical change. (3) 8.3 Two Grade 10 … Read more
8.1 Electromagnetic radiation has a wave-particle duality. What does this mean? (2) 8.2 Arrange the following types of electromagnetic radiations in order of decreasing wavelength. Infrared, gamma ray, visible light, x-ray (2) 8.3 Define a photon. (2) An electromagnetic wave has a wavelength of 2,5 x 10-9 m. 8.4 Calculate the amount of energy that … Read more
The types of electromagnetic radiation are arranged according to frequency in the tablebelow. 8.1 How are electromagnetic waves generated? (1) 8.2 What type of electromagnetic radiation has the highest energy? (1) 8.3 Explain the answer to QUESTION 8.2. (2) 8.4 A certain type of electromagnetic radiation has a wavelength of 600 x 10-10 m. 8.4.1 … Read more
8.1 Consider the chemical reaction below: 8.1.1 Define a base according to a Lowry-Bronsted theory. (2) 8.1.2 Write down ONE conjugate acid-base pair in the equation. (1) 8.1.3 Is the reaction mixture ACIDIC or ALKALINE at the completion of the reaction? Give a reason for your answer. (2) 8.1.4 Write down the formula of a … Read more
Two identical point charges are placed 100 mm apart in a vacuum as shown below. The electrostatic force that Q1 exerts on Q2 is 5,09 N. 8.1 Draw the electric field pattern between the two charges. (3) 8.2 Calculate the magnitude of each charge. (4) 8.3 Calculate the net electric field at point P, as … Read more
Ammonia can readily dissolve in water according to the equation below: 8.1 Explain why a hydroxide ion is regarded as a Lowry-Brønsted base. (2) 8.2 Identify the type of bond responsible for the formation of the ammonium ion inthe above equation. (1) 8.3 Write a balanced equation to show how the ampholyte in the above … Read more