The particulate nature of matter
73 past-paper questions on The particulate nature of matter · examined 2020–2025.
20258 questions
© UCLES 2025 5070/11/O/N/25 3 The main component of mineral X is calcium carbonate, CaCO3. X also contains tiny grains of silicon( IV ) oxide, SiO2. There are no other substances in X. Which row shows two correct statements about X? statement 1 statement 2 A X is a compound X contains exactly four different elements B X is a compound X contains exactly five different elements C X is a mixture X contains exactly four different elements D X is a mixture X contains exactly five different elements 3
4 The structure of hydroxylamine, NH2OH, is shown. N H H OH Which row about hydroxylamine is correct? total number of electrons in the molecule number of electrons in the bonds of the molecule A 14 8 B 14 6 C 18 8 D 18 6
5 Metals lose electrons when they combine with a non-metal to form an ionic compound. Calcium combines with hydrogen to form the ionic compound calcium hydride, CaH2. How many electrons are there in the outer shell of each of the two hydride ions in CaH2? A 0 B 1 C 2 D 4
© UCLES 2025 5070/11/O/N/25 [Turn over 7 Which statement about the bonding in copper is correct? A Copper atoms are attracted to a ‘sea’ of delocalised electrons. B Copper atoms are attracted to a shared pair of electrons. C Copper ions are attracted to a ‘sea’ of delocalised electrons. D Copper ions are attracted to a shared pair of electrons. 4 3+ 2–
9 Which statement is correct? A The concentration of a solution is expressed in dm 3 / mol. B The empirical formula of a compound always gives the actual numbers of each type of atom in one molecule. C The molecular formula of a compound always contains more atoms than the empirical formula. D The relative atomic mass of an element is 12 - carbon of atom one of mass the element the of atom one of mass average the 12 1 .
10 How many atoms are there in 27.0 g of water, H2O? A 9.030 10 23 B 1.806 10 24 C 2.709 10 24 D 3.612 10 24
© UCLES 2025 5070/11/O/N/25 11 A mixture of sodium hydrogencarbonate and sodium chloride is heated. The equation for the reaction that takes place when sodium hydrogencarbonate is heated is shown. 2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) Sodium chloride is unchanged on heating. When 6.0 g of the mixture is heated, the loss in mass is 1.5 g. What is the percentage by mass of sodium hydrogencarbonate in the mixture? [relative molecular mass, M r: NaHCO3, 84; Na2CO3, 106; CO2, 44; H2O, 18] A 34% B 48% C 68% D 95% 5
19 Two compounds are dissolved separately in water. When the two solutions are mixed, there is no observable change. What are the two compounds? A sodium chloride and barium nitrate B sodium chloride and lead nitrate C sodium sulfate and barium chloride D sodium sulfate and lead chloride
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