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An unknown mass of gas is sealed in container M. The temperature is increased andthe pressure inside the container is measured.The experiment is now repeated using the same mass of the same gas in a differentcontainer, N.The results obtained are represented in the sketch graph below. 5.1 Determine the value of X as shown on … Read more

The melting points and boiling points of four substances (A, B, C and D) are shown inthe table below. 3.1 Define the term melting point. (2) 3.2 Explain the difference in melting points of HF and HCℓ by referring to theTYPE of intermolecular forces. (4) 3.3 Which ONE of the substances (A, B, C or … Read more

2.1 Ammonia NH3(g) and hypochlorous acid HOCℓ(ℓ) are both examples ofcovalent compounds. 2.1.1 Define the term bonding pair. (2) 2.1.2 Draw Lewis structures for the following molecules: (a) NH3 (2)(b) HOCℓ (2) 2.1.3 Write down the: (a) Number of bonding pairs in NH3 (1)(b) Number of lone pairs on the oxygen atom in HOCℓ (1)(c) … Read more

Various options are provided as possible answers to the following questions. Choose   the answer and write only the letter (A–D) next to the question numbers (1.1 to 1.10) in the ANSWER BOOK, e.g. 1.11 E. Each question has only ONE correct answer. 1.1 The number of valence electrons in a silicon atom is … A … Read more