This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.
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Here are the solutions for the activity. 2.4 Consider the diagrams of four different substances below: P: Represents a mono-atomic element (individual identical atoms). Q: Represents a diatomic element (identical molecules, each with two identical atoms). R: Represents a compound (identical molecules, each with two different types of atoms). S: Represents a mixture of two different elements (individual small atoms and diatomic larger atoms). 2.4.1 Identify each of the following: a) Pure substances. Pure substances are elements or compounds. Answer: P, Q, R b) A diatomic element. A diatomic element consists of molecules made of two identical atoms. Answer: Q c) A mono-atomic element. A mono-atomic element consists of individual identical atoms. Answer: P d) A mixture. A mixture contains different types of particles not chemically bonded together. Answer: S e) A compound consisting of two different elements. A compound consists of molecules made of two or more different types of atoms chemically bonded. Answer: R 2.4.2 Which one of P, Q or R represents each of the following the best? a) Carbon monoxide (CO) CO is a compound made of one carbon atom and one oxygen atom. Diagram R shows molecules made of two different types of atoms. Answer: R b) Helium atoms Helium (He) is a noble gas and exists as individual atoms. Diagram P shows individual atoms. Answer: P c) Oxygen gas molecules Oxygen gas (O_2) is a diatomic element. Diagram Q shows diatomic molecules of the same type of atom. Answer: Q 2.4.3 For diagram S, which one of the following statements is TRUE? Diagram S shows individual small atoms and diatomic molecules of larger atoms, indicating two different elements mixed together. A: It is a mixture. B: It is a pure substance. C: It is an element. D: It is a compound. The correct statement is that it is a mixture. Answer: A 2.5 Consider the diagram: The diagram shows 5 identical molecules. Each molecule consists of one central dark atom bonded to four lighter atoms. 2.5.1 How many molecules can you identify in the diagram? Count the distinct groups of atoms. There are 5 such groups. Answer: 5 2.5.2 How many atoms are there in one molecule? Each molecule has 1 central dark atom and 4 lighter atoms. Total atoms per molecule = 1 + 4 = 5. Answer: 5 2.5.3 How many different elements are represented in the diagram? There are two types of atoms (dark and light), representing two different elements. Answer: 2 2.5.4 How many atoms are there in TOTAL represented in the diagram? There are 5 molecules, and each molecule has 5 atoms. Total atoms = 5 molecules × 5 atoms/molecule = 25 atoms. Answer: 25 2.5.5 Choose the correct answer: (Based on the structure shown, one central atom bonded to four others) The diagram represents a molecule with one central atom bonded to four other atoms. This structure is characteristic of methane (CH_4). Answer: CH_4 3 done, 2 left today. You're making progress.