Learners investigate how the type of substance affects electrical conductivity of thesubstance. They conduct three experiments using three different substances under thesame conditions, as shown in the table below. 8.1 Define the term electrolyte. (2) 8.2 For the investigation, write down the: 8.2.1 Investigative question (2) 8.2.2 Dependent variable (1) 8.2.3 Independent variable (1) 8.2.4 … Read more
A group of learners prepare a 0,25 mol∙dm-3 solution of sodium carbonate by dissolvinga 14,2 g sample of hydrated sodium carbonate (Na2CO3∙xH2O) in 200 cm3 of water. 7.1 Explain the meaning of the term hydrated. (1) 7.2 Write down a BALANCED CHEMICAL EQUATION to show how sodium carbonate dissociates in water. (2) 7.3 Learners then … Read more
Study the diagram below showing structures of two different substances (A and B) andanswer the questions that follow. 6.1 Choose the substance (A or B) that describes the following: 6.1.1 Metallic structure (1) 6.1.2 Structure of magnesium chloride (1) 6.2 Explain how the type of bond in substance A forms. (2) 6.3 Name the type … Read more
Study the physical and chemical processes below and answer the questions thatfollow. X: H2O(s) → H2O(g)Y: CaCO3(s) ∆ → CaO(s) + CO2(g)Z: Iron + Oxygen → Iron(III) oxide 5.1 Define the term physical change. (2) 5.2 Write down the LETTER of the process that represents the following: 5.2.1 Physical change (1) 5.2.2 Decomposition reaction (1) … Read more
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
Experiments were done to investigate the effect of temperature on the speed of sound.One person beat a drum while another person, who was standing 50 m away from thesound source, recorded the time travelled by the sound. They performed the experiment at different temperatures at different times of the day.They recorded their findings in the … Read more
Study the two transverse waves, P and Q, as shown below. 6.1 Write down ONE difference and ONE similarity between wave P and wave Q. (2) 6.2 For wave pattern P, write down: 6.2.1 Two points that are out of phase (1) 6.2.2 The amplitude of the wave (1) 6.3 Define the term frequency of … Read more