Essential Chemistry SPM Question Bank

Chapter 1: Introduction to Chemistry

Paper 1

1) W, X, Y and Z are steps involved in the scientific investigation.

Which of the following sequences is correct?A Z, W, X, YB W, Z, Y, XC Z, W, Y, XD Y, Z, W, X

2) Which of the following is the most accurate definition of hypothesis?A Hypothesis is the interpretation of the data collected during an investigationB Hypothesis is a statement about an investigation whose truth has been provenC Hypothesis is the result of an investigationD Hypothesis is a statement about the relationship between the variable that is manipulated

and the variable that responds

3) Why must we plan the methods and techniques to be used prior to a scientific investigation?A To ensure that the data collected is more accurateB To ease the collection of dataC To collect the data in a faster wayD To conduct an investigation easily

4) When planning a scientific investigation, the following is conducted exceptA the determination of the data collection method B the determination of the ways of controlling the variables that are kept constantC the selection of as many manipulated variables as possibleD the listing of all suitable materials and apparatus to be used

5) The figure below shows an experiment to study the relationship between the oscillation of the weight and the length of the thread.

Which of the following is paired correctly?

Variable that is kept constant Variable that is manipulatedA Length of the thread Time of the oscillation B Mass of the weight Length of the threadC Time of the oscillation Shape of the weightD Shape of the weight Time of the oscillation

6) Which of the following variables has its value obtained through observation in an experiment?A Independent variable B Variable that is kept constantC Variable that is manipulatedD Variable that responds

7) A student would like to investigate how different materials affect the rate of metal expansion. Which of the following variables should not be made constant?

A Type of material B Heat suppliedC Shape of the materialD Atmospheric pressure

8) The graph in the figure below shows the relationship between the voltage value and current value in an experiment.

The variable that responds in the experiment is the A voltageB currentC resistanceD time taken

9) The following must be observed when making a hypothesis exceptA give suggestions or explanations based on the scientific principleB change the data to support the hypothesis madeC use the existing knowledge to explain a phenomenonD admit that there are other ways to explain an occurrence

10) Which of the following statements about variables is not true?A Variables that are manipulated are independent variablesB Variables that respond are data collected from an investigation C Variables that respond are determined by variables that are kept constantD Variables that are kept constant are variables that are fixed in an experiment

11) What is the first step that is taken in a scientific investigation?A Controlling the variablesB Making an inferenceC Making a hypothesisD Identifying the problem

12) Which of the following are scientific and noble values?I Critical and analytical thinkingII Being systematic III Interest and curiosityA I and II onlyB I and III onlyC II and III onlyD I, II and III

13) Which of the following are carried out in a scientific method?I PredictingII ObservingIII GratefulA I and II onlyB I and III onlyC II and III onlyD I, II and III

14) Which of the following is a hypothesis statement?I The evaporation rate of water is influenced by the exposed areaII The bigger the size of a gas jar, the longer the candle will burn in the gas jarIII The Earth is one of the planets in the solar systemA III onlyB I and II onlyC II and III onlyD I, II, and III

15) The following steps are taken while collecting and interpreting data in a scientific investigation except

I the data collected can be interpreted in the form of a tableII the data recorded can be shown in a histogramIII any data that is believed to be incorrect should be removedA III onlyB I and II onlyC I and III onlyD II and III only

Paper 3

Referring to the statement above, plan one laboratory experiment to investigate the effect of temperature on the solubility of solid salt in hot water and in cold water. Your plan should include the following aspects:

(i) Aim of the experiment (ii) All the variables(iii) Statement of the hypothesis(iv) List of materials and apparatus(v) Procedure of the experiment(vi) Tabulation of data

When hot water is poured on solid salt, the solid salt is found to have dissolved faster than it would in cold water.

Answers:Paper 11 C 11 D2 D 12 D3 D 13 A4 C 14 B5 B 15 A6 C7 A8 A9 B10 C

Paper 3(i) To study the effect of temperature on the solubility of solid salt in water

(ii) Variable that is manipulated: Temperature of the waterresponds : Solubility of the salt/ Time taken for all the salt to dissolve in the

wateris kept constant: Quantity of salt/ Volume of the water

(iii) When the temperature of the water increases, less time is taken by the salt to dissolve in the water.

(iv) List of materials: Solid table salt, water

List of apparatus: Beaker, thermometer, wire gauze, tripod stand, Bunsen burner, stopwatch

(v) Procedure1) 50 cm3 of water is poured into a beaker at room temperature.2) 5 g of solid table salt is put into the beaker and stirred.3) At the same time, the stopwatch is started and the time taken for all the solid

table salt to dissolve in the water is recorded.4) The experiment is repeated using the same volume of water and mass of solid

table salt but the mixture is now heated to a temperature of 80oC.

(vi) Tabulation of data

Temperature of the water/ oC Time taken for all the salt to dissolve in the water/ s3080