6.1 Initially, 4 moles H2(g) and 4 moles I2(g) are allowed to react in a sealed2 dm3 flask according to the following balanced equation: H2(g) + I2(g) ⇌ 2HI(g) ΔH < 0 The graph below shows the concentrations of H2(g) and HI(g) versus time during the reaction.
A car moves at a constant speed of 10 m∙s-1 TOWARDS a stationary sound source.The sound source emits sound waves of frequency 880 Hz.A sound detector A is attached to the car and another sound detector B is attached to the sound source. Detector B detects the sound waves reflected from the car. The speed … Read more
Consider the balanced equation below for a hypothetical reaction that takes place in a sealed 2 dm3container at 300 K.2P(g) + Q2(g) ⇌ 2PQ(g) 6.1 Define the term chemical equilibrium. (2) 6.2 The amount of each substance present in the equilibrium mixture at 300 K is shown in the table below. The temperature of the … Read more
Pure hydrogen iodide gas, HI(g), of concentration 1 mol∙dm-3 , is sealed in a 500 cm3container at temperature T. The reaction reaches equilibrium according to the following balanced equation: 6.1 Define the term chemical equilibrium. (2) 6.2 The graph below shows how the concentrations of the reactant and products vary with time during the reaction. … Read more
6.1 State the Doppler effect. (2) 6.2 Use the graph to answer the following questions. 6.2.1 Write down the frequency of the sound emitted by the stationarysource.Give a reason for the answer. (2)6.2.2 In which direction is the car moving relative to the source?Choose from TOWARDS or AWAY.Give a reason for the answer. (2)6.2.3 Calculate … Read more
SECTION D: POETRY In this section, questions are set on the following poems: NOTE: Answer the questions set on BOTH poems, i.e. QUESTION 6.1 ANDQUESTION 6.2. QUESTION 6 6.1 Read the poem carefully and then answer the questions which follow.The number of marks allocated to each question serves as a guide to theexpected length of … Read more
SECTION D: POETRY In this section there are questions set on the following poems: NOTE: Answer the questions set on BOTH poems, i.e. QUESTION 6.1 AND QUESTION 6.2. 6.1 Read the poem carefully and then answer the questions which follow. The number of marks allocated to each question serves as a guide to the expected … Read more
Hydrogen gas, H2(g), reacts with sulphur powder, S(s), according to the followingbalanced equation: The system reaches equilibrium at 90 °C. 6.1 Define the term chemical equilibrium. (2) 6.2 How will EACH of the following changes affect the number of moles of H2S(g) at equilibrium? Choose from INCREASES, DECREASES or REMAINS THE SAME. 6.2.1 The addition … Read more
An unknown gas, X2(g), is sealed in a container and allowed to form X3(g) at 300 °C. The reaction reaches equilibrium according to the following balanced equation: 3X2(g) ⇌ 2X3(g) 6.1 How will the rate of formation of X3(g) compare to the rate of formation of X2(g) at equilibrium? Write down only HIGHER THAN, LOWER … Read more
(Start on a new page.) 6.1 An ambulance is moving towards a stationary listener at a constant speed of 30 m∙s-1. The siren of the ambulance emits sound waves having a wavelength of 0,28 m. Take the speed of sound in air as 340 m∙s-1. 6.1.1 State the Doppler effect in words. (2) 6.1.2 Calculate … Read more