OCR 2023 Chemistry B H033/01: Foundations of chemistry AS Level Question Paper & Mark Scheme (Merged)

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 It is toxic to humans. D It is pale green. Your answer [1] 3 OCR 2023 Turn over 4 OCR 2023 4 A solid substance has a high melting point and does not conduct electricity. Which type of structure does this substance have? A Ionic lattice B Metallic lattice C Simple molecular D Structure resembling graphite Your answer [1] 5 A student looks up the concentrations of two gases in a sample. The concentration of gas Y is given as 0.0001% and the concentration of gas Z is given as 1ppm. What is correct about the gases in the sample? A Gases Y and Z are present in equal concentrations.