Chemistry

1 This question is about Group 2 compounds. Group 2 hydroxides can be used to neutralise acidity in a variety of contexts. Magnesium hydroxide may be used to neutralise excess stomach acidity and calcium hydroxide may be used to neutralise acidity in soils. The hydroxides are formed when the oxides react with water. (a) Write an equation to show the ions formed when calcium oxide reacts with water. [1] (b) A student shakes a small amount of magnesium oxide in a test tube with water. A whi...

2 OCR 2023 Section A You should spend a maximum of 25 minutes on this section. Write your answer to each question in the box provided. 1 What is the outer electron configuration of tellurium, Te? A 4p6 B 4s2 4p4 C 5p6 D 5s2 5p4 Your answer [1] 2 Which of the following exists as cis/trans isomers? A (CH3 ) 2CCHCH3 B CH3CHCHCH3 C CH3CH2CH2CH3 D CH2C(CH3 ) 2 Your answer [1] 3 Which of these properties of chlorine is a benefit to humankind? A It is a bleach. B It is a gas. C ...

2 OCR 2023 1 This question is about the first 36 elements in the periodic table: H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr From these 36 elements only, write the symbol for the element(s) that fit each description. (a) The three elements that, when in a molecule, can form hydrogen bonds with other suitable molecules. .......................................................... [1] (b) The element in Period 2 with the successive io...

2 OCR 2023 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Which compound is used for proton exchange in NMR spectroscopy? A CCl 4 B CDCl 3 C D2O D Si(CH3 ) 4 Your answer [1] 2 Which compound reacts with 2,4-dinitrophenylhydrazine but does not react with Tollens’ reagent? A C6H5COCOOH B C6H5CH(OH)CHO C CH3COCHO D CH3CH2CH(OH)CH3 Your answer [1] 3 Propyne, CH3C≡CH, is a member of the alkynes ...

2 OCR 2023 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Which sample contains the greatest number of molecules? A 35.0 g of C2H2 B 45.0 g of C2H6 C 60.0 g of C4H10 D 100.0g of C6H6 Your answer [1] 2 0.688g of an oxide of manganese is reduced by hydrogen gas to form manganese metal and 0.235g of water. What is the formula of the oxide of manganese? A MnO B MnO2 C Mn2O3 D Mn3O4 Your answer [1] 3 How...

2 OCR 2023 1 This question is about titanium (atomic number 22) and its compounds. (a) Titanium exists as a mixture of five isotopes. A chemist analyses a sample of titanium using mass spectrometry. The results are shown in the table below. Isotope Abundance (%) 46Ti 8.30 47Ti 7.40 48Ti 73.70 49Ti 5.40 50Ti 5.20 (i) Calculate the relative atomic mass of titanium in the sample. Give your answer to 2 decimal places. relative atomic mass = ................................................

2 OCR 2023 SECTION A You should spend a maximum of 25 minutes on this section. Write your answer to each question in the box provided. 1 Which statement explains the trend in boiling points down the halogens group? A Covalent bonds become stronger. B Induced dipole–dipole interactions (London forces) become stronger. C Ionic bonds become stronger. D Permanent dipole–dipole interactions become stronger. Your answer [1] 2 A hydrocarbon contains 85.71% carbon by mass. What is the em...

Chem Metal Reactivity Report

Y11 Chemistry T3 Extensive Notes

Y11 Chemistry Notes Term 2