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devozeeba Study the table below and answer the questions that follow. 4.1 Define the term atomic number. (2) 4.2 Write down the: 4.2.1 Chemical symbol of element Q using the notation (2) 4.2.2 Element (P, Q or R) that is an alkali metal (1) 4.2.3 Chemical symbol of R (2) 4.3 Element P reacts with oxygen … Read more
The vapour pressure versus temperature graph below was obtained for four unknownliquids (A, B, C and D). Atmospheric pressure is measured as 101,3 kPa. 3.1 Define the term boiling point. (2) Use the information given in the graph to answer the questions that follow. 3.2 Write down the: 3.2.1 Boiling point of liquid B (1) … Read more
The diagram below shows three different substances, P, Q and R. 2.1 Define the term element. (2) Use the diagram and the key provided to answer the questions that follow. 2.2 Write down a LETTER that represents the following: 2.2.1 Pure substance (1) 2.2.2 Homogeneous mixture (1) 2.2.3 Heterogeneous mixture (1) 2.3 Indicate whether the … Read more
Various options are provided as possible answers to the following questions. Eachquestion has only ONE correct answer. Choose the answer and write only the letter(A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1. 11 D. 1.1 Which ONE of the following substances is NOT a pure substance? A IronB … Read more
11.1 Consider the circuit diagram below. Switch S is OPEN. 11.1.1 Write down the reading on the following: (a) Voltmeter (V1) (1) (b) Ammeter (A1) (1) Switch S is now CLOSED. 11.1.2 Calculate the equivalent resistance of the circuit. (4) 11.1.3 Calculate the reading on voltmeter V2. (3) 11.1.4 How do the readings on ammeters … Read more
10.1 The mining industry contributes towards the South African economy. Gold is one of the minerals that is being mined in South Africa. 10.1.1 Write down the name of the location of the major mining activity in South Africa. (1) The following chemical reaction occurs during the final steps in the recovery process of gold. … Read more
Two identical insulated spheres, X and Y, suspended by threads from a ceiling, areheld at a small distance apart, as shown in the diagram below. Sphere X carries a charge of + 4 x 10-18 C, while sphere Y has an excess of30 electrons. 10.1 Calculate the magnitude of the charge on sphere Y. (3) … Read more
Four metallic bars, suspended freely from a ceiling, interact, as shown in the diagrambelow. The points of attachment of X and Y on the ceiling are 4 cm apart. The two bars in the middle are bar magnets (X and Y) and the distance between themis 5 cm. One of the bars (A or B) … Read more
9.1 Consider the redox reaction given below. 9.1.1 Define oxidation reaction in terms of electron transfer. (2) Write down the: 9.1.2 Formula of the reducing agent. (2) 9.1.3 Reduction half reaction (2) 9.2 Consider the redox reaction below: 9.2.1 Determine the oxidation number of nitrogen (N) in . (2) 9.2.2 Balance the above chemical equation … Read more