8.1 Two reactions of sulphuric acid are shown in the diagram below. 8.1.1 Define a Lowry-Brønsted base.(2) 8.1.2 Write down a balanced equation for Reaction 1.(3) 8.1.3 Write down the NAME of the salt represented by X.(2) 8.1.4 Write down the FORMULA of ampholyte A.(2) 8.1.5 Write down the formulae of the TWO conjugate acid-base … Read more
The equation for the combustion of butane gas is given below. 7.1 Define the term activation energy.(2) 7.2 Is the combustion reaction of butane exothermic or endothermic? Give areason for the answer.(2) 7.3 Draw a sketch graph of potential energy versus course of reaction for thereaction above. Clearly indicate the following on the graph: Activation … Read more
5.1 TABLE 3 below shows the information about the dams that had above ten millioncubic metres of water in January 2016. The terms “fullest and emptiest” are used toindicate the amount of water in the dam in relation to its capacity. Use TABLE 3 to answer the questions that follow. 5.1.1 Identify the fullest dam … Read more
4.1 Study the floor plan of the shopping mall below and answer the questions thatfollow. 4.1.1 Determine the number of 2 x 3 units. (2) 4.1.2 Identify the size of units found at the corners of the mall. (2) 4.1.3 Lindi entered the mall on the West side. She went straight throughRegion V and turned … Read more
3.1 Dogs are fed according to their weight to keep them healthy. Nikki keeps two dogs,Tiger and Tommy, which weigh 22 kg and 42 kg respectively.Study the dog food specifications label in TABLE 2 below to answer the questionsthat follow. 3.1.1 Calculate the amount of daily minimum food requirements for the twodogs. Give your answer … Read more
6.1 The decomposition of hydrogen peroxide in the presence of a catalyst at standard pressure and room temperature is given by the unbalanced chemical equation below. The oxygen gas is collected and the volume is recorded over a period of time.The reaction is completed at time t. The results are plotted on a graph of … Read more
Weather balloons are sent into space to gather data. The balloons usually burst at apressure of 27 640 Pa and a volume of 36,3 m3. The data collector then falls back to Earth. The gas in a certain weather balloon has an initial volume of 12,6 m3 and pressure of105 000 Pa at a temperature … Read more
In an experiment to investigate the relationship between pressure and temperature ofan enclosed gas, 48 g of oxygen gas was sealed in a container. The results obtainedare recorded in the table below. 4.1 Draw a graph of pressure versus temperature on the attached ANSWERSHEET. Extrapolate the graph so that it intersects the y-axis. (4) 4.2 … Read more
Consider the list of six substances with their formulae and boiling points in the tablebelow. 3.1 Explain why ethanol is soluble in water. Refer to the relative strength of theintermolecular forces in ethanol and water. (3) 3.2 Explain why the boiling point of iodine is higher than that of bromine. Refer tothe intermolecular forces present … Read more