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addmath form 4 Chapter 1 - Function
form 4 chapter 1 past year questionsFull description
Short notes of chemistry SPM for form 4 ,, effective with mind maps and tables , helps for last minute study...
Chapter 1 Introduction to Chemistry Paper 1 Answer all the questions. Questions 1-5 are based on the figure below. 1 cotton conical flask
marble chips
dilute hydrochloric acid
xxxg
digital balance
The figure shows the apparatus set-up of an experiment to investigate the effect of concentration of hydrochloric acid on the rate of reaction. 5 g of marble chips are added to 50 cm3 of 1.0 mol dm –3 hydrochloric acid. The balance reading is t aken immediately after the marble chips are added and again at one-minute of intervals until the reaction is completed. The experiment is repeated by changing the concentration of hydrochloric acid to 0.5 mol dm –3. The fixed variables in this experiment are I the concentration of hydrochloric acid II the mass of marble chips used III the volume of hydrochloric acid IV the interval time taken for the reactants to react completely A I,II and III only B I, II and IV only C II, III and IV only D I,II,III and IV 2
The responding variable of this experiment is A the colour change of the mixture B the interval time taken until all marble chips are dissolved C the change in temperature of the mixture D the rare of the mass of the reaction mixture
3
Which of the following statements correctly describes the hypothesis of this experiment? A The higher the concentration of acid, the smaller the size of marble chips. B The lower the concentration of acid, the greater the volume of gas evolved. C The lower the concentration of acid, the lower the rate of mass loss of the reaction mixture. D The greater the total mass loss over 3 minutes, the higher the temperature of the acid.
4
A hypothesis is a statement that shows the relationship between the A fixed variables and the conclusion B fixed variable and the inference C fixed variable and the manipulated variable D manipulated variable and the responding variable
Which of the following is the t he most suitable form to record quantitative measurement? measurement? A Videotaping B Draw diagram C Tabulate the data D Memorising
6
Which of the following is correct about the hypothesis? A A general statement about the relationship between the manipulated variable and the responding variable B A condition that in fluences the results of the t he experiment C A smart guess that explains the problem D A series of planned steps done systematically to solve problems
7
Which of the following careers require the knowledge of chemistry? I Doctor II Beautician III Nutritionist IV Accountant A I and III only B II and IV only C I, II and III only D II,III and IV only
Questions 8 – 9 are based on the information below. 8
Problem statement: What is the effect of increasing concentration of sulphuric acid on the rate of its reaction with magnesium ribbon? Which are the manipulated variable and the fixed variable for this experiment? Manipulated Manipulate d variable A B C D
9
Fixed variable
Concentrati on of sulphuric acid Concentration Concentration Concentrati on of sulphuric acid Rate of reaction Temperature which reaction occurs
Volume of sulphuric acid Temperature which reaction occurs Concentration Concentrati on of sulphuric acid Concentration Concentrati on of sulphuric acid
The rate of reaction between magnesium magnesium and dilute sulphuric acid in this t his experiment is the A manipulated variable B fixed variable C responding variable D inference
10 Table salt and vinegar are commonly used in our daily life. Which of the following chemicals are contained in table salt and vinegar? A B C D
