The reaction of calcium carbonate (CaCO3) and EXCESS dilute hydrochloric acid(HCℓ) is used to investigate one of the factors that affects reaction rate. The balancedequation for the reaction is: The same mass of CaCO3 is used in all the experiments and the temperature of thehydrochloric acid in all experiments is 40 °C. The reaction conditions … Read more
The flow diagram below shows how various organic compounds can be prepared usingcompound P as starting reagent 4.1 Write down the meaning of the term hydrohalogenation. (2) 4.2 Write down the STRUCTURAL FORMULA of compound Q. (2) 4.3 Reaction I is an elimination reaction. Write down the: 4.3.1 TYPE of elimination reaction (1) 4.3.2 MOLECULAR … Read more
The relationship between boiling point and the number of carbon atoms in straightchain molecules of aldehydes, alkanes and primary alcohols is investigated. Curves A,B and C are obtained. 3.1 Define the term boiling point. (2) 3.2 Write down the STRUCTURAL FORMULA of the functional group of the aldehydes. (1) 3.3 The graph shows that the … Read more
The letters A to E in the table below represent five organic compounds. Use the information in the table to answer the questions that follow 2.1 For compound D, write down the: 2.1.1 Homologous series to which it belongs (1) 2.1.2 IUPAC name of a FUNCTIONAL ISOMER (2) 2.2 Write down the: 2.2.1 IUPAC name … Read more
Various options are provided as possible answers to the following questions. Choosethe answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) inthe ANSWER BOOK, e.g. 1.11 E. 1.1 Which ONE of the following is the general formula for the alkanes? (2) 1.2 The EMPIRICAL FORMULA of hexanoic acid is … Read more
The siren of a train, moving at a constant speed along a straight horizontal track, emitssound with a constant frequency. A detector, placed next to the track, records thefrequency of the sound waves. The results obtained are as shown in the graph below. 6.1 State the Doppler effect in words. (2) 6.2 Does the detector … Read more
A roller-coaster car of mass 200 kg, with the engine switched off, travels alongtrack ABC which has a rough surface, as shown in the diagram below. At point A,which is 10 m above the ground, the speed of the car is 4 m·s-1. At point B, which is at a height h above the ground, … Read more
Ball P of mass 0,16 kg, moving east at a speed of 10 m∙s-1 , collides head-on with another ball Q of mass 0,2kg, moving west at a speed of 15 m∙s-1 . After the collision, ball P moves west at a speed of 5 m∙s-1, as shown in the diagram below. Ignore the effects … Read more
A 20 kg block, resting on a rough horizontal surface, is connected to blocks P and Q bya light inextensible string moving over a frictionless pulley. Blocks P and Q are gluedtogether and have a combined mass of m. A force of 35 N is now applied to the 20 kg block at an angle … Read more
1.1 The rate of change of momentum of an object is equal to the … A impulse on the object. B net force acting on the object. C product of the object’s mass and its change in velocity. D product of the net force acting on the object and its acceleration. (2) 1.2 The gravitational … Read more