3.1 The boiling point of compounds A to E are given in the table below. 3.1.1 Define the term boiling point. (2) 3.1.2 Calculate the molecular mass of compound D. (1) 3.1.3 In what phase is compound B at 25 °C? (1) 3.1.4 Name the type of intermolecular force present in compound A. (1) 3.1.5 … Read more
Molecules such as CO2 and H2O are formed through covalent bonding. 2.1 Define the term covalent bonding. (2) 2.2 ONE of the above molecules has lone pairs of electrons on the central atom. Draw the Lewis diagram for this molecule. (2) 2.3 H3O+ is formed when H2O forms a dative covalent bond with an H+ … Read more
Four options are provided as possible answers to the following questions. Eachquestion has only ONE correct answer. Choose the answer and write only theletter (A–D) next to the question number (1.1–1.10) in the ANSWER BOOK, forexample 1.11 E. 1.1 Vector P and vector –P are acting on a common point O. The angle betweenthe two … Read more
1.1 According to the Arrhenius theory, all bases … A) are proton donors. B) are proton acceptors. C) form H3O+ ions in solution. D) form OH‾ ions in solution. (2) 1.2 The number of neutrons in an atom of N157 is … A) 5 B) 7 C) 8 D) 15 (2) 1.3 Which ONE of the following has the strongest forces between its … Read more
MULTIPLE-CHOICE QUESTIONS Four options are provided as possible answers to the following questions.Each question has only ONE correct answer. Choose the answer and write onlythe letter (A–D) next to the question number (1.1–1.10) in the ANSWER BOOK,for example 1.11 E. 1.1 The type of bond formed between a H+ ion and H2O is called a/an … Read more
6.1 The decomposition of hydrogen peroxide in the presence of a catalyst at standard pressure and room temperature is given by the unbalanced chemical equation below. The oxygen gas is collected and the volume is recorded over a period of time.The reaction is completed at time t. The results are plotted on a graph of … Read more
Weather balloons are sent into space to gather data. The balloons usually burst at apressure of 27 640 Pa and a volume of 36,3 m3. The data collector then falls back to Earth. The gas in a certain weather balloon has an initial volume of 12,6 m3 and pressure of105 000 Pa at a temperature … Read more
In an experiment to investigate the relationship between pressure and temperature ofan enclosed gas, 48 g of oxygen gas was sealed in a container. The results obtainedare recorded in the table below. 4.1 Draw a graph of pressure versus temperature on the attached ANSWERSHEET. Extrapolate the graph so that it intersects the y-axis. (4) 4.2 … Read more
Consider the list of six substances with their formulae and boiling points in the tablebelow. 3.1 Explain why ethanol is soluble in water. Refer to the relative strength of theintermolecular forces in ethanol and water. (3) 3.2 Explain why the boiling point of iodine is higher than that of bromine. Refer tothe intermolecular forces present … Read more
(2) 2.1 Define the term covalent bond. 2.2 Draw Lewis structures for: 2.2.1 CH3Cℓ (2) 2.2.2 CO2 (2) 2.3 How many lone-pair electrons are on the central atom in the CO2 molecule? (1) 2.4 Identify ONE of the substances in Reaction 2 that can form a dative covalentbond when reacting with an acid. (1) 2.5 … Read more