This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
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Welcome back Dacoasta — missed you this week. (c) Circuit Symbols (c)(i) Name the symbols labelled II, III and IV. II: Resistor* III: Switch* IV: Voltmeter* (c)(ii) Draw a circuit diagram using all the symbols labelled I, II, III, IV and V. The circuit diagram should show a cell (I), a switch (III), a resistor (II), and an ammeter (V) connected in series. A voltmeter (IV) should be connected in parallel across the resistor (II). (c)(iii) If the circuit is closed and V reads 5 units with IV reading 5 units, determine the value of II in S.I. units. Step 1: Identify the given values. Symbol V represents an ammeter, so the current I = 5 A. Symbol IV represents a voltmeter, so the voltage V = 5 V. Symbol II represents a resistor, R. Step 2: Apply Ohm's Law. Ohm's Law states that V = IR. To find the resistance R, we rearrange the formula: R = (V)/(I) Step 3: Substitute the values and calculate. R = 5 V5 A R = 1 The value of II (the resistor) is 1 Ohm. (d) pH and Solutions (d)(i) Identify the solution that would have a pH value equal to: (a) 7: This corresponds to a neutral solution. Sodium chloride (NaCl) is a salt of a strong acid and a strong base, making its solution neutral. Solution: C* (b) 14: This corresponds to a very strong basic solution. Sodium hydroxide (NaOH) is a strong base. Solution: E* (d)(ii) Identify the solution that can be classified as a/an: (a) strong acid: Hydrochloric acid (HCl) is a strong acid. Solution: A* (b) neutral: Sodium chloride (NaCl) is a neutral salt. Solution: C* (c) weak base: Ammonia (NH₃) is a weak base. Solution: D* (d) weak acid: Ethanoic acid (CH₃COOH) is a weak acid. Solution: B* (d)(iii) Suggest the pH value of solution A. Step 1: Identify the solution and its concentration. Solution A is 0.1 mol dm⁻³ HCl. HCl is a strong acid. Step 2: Determine the hydrogen ion concentration. For a strong acid, the concentration of hydrogen ions is equal to the acid's concentration. [H^+] = 0.1 mol dm^-3 = 10^-1 mol dm^-3 Step 3: Calculate the pH. The pH is calculated using the formula pH = -_10[H^+]. pH = -_10(10^-1) pH = -(-1) pH = 1 The pH value of solution A is 1. (d)(iv) Identify two solutions in the table that will react to form salt and water. This reaction is a neutralization reaction between an acid and a base. From the table, acids are A (HCl) and B (CH₃COOH). Bases are D (NH₃) and E (NaOH). Two solutions that will react to form salt and water are A (HCl) and E (NaOH). (d)(v) What would be the colour of solution C upon addition of drops of universal indicator. Step 1: Identify solution C. Solution C is 0.1 mol dm⁻³ NaCl. Step 2: Determine the nature of solution C. NaCl is a salt formed from a strong acid (HCl) and a strong base (NaOH), making it a neutral solution with a pH of 7. Step 3: State the universal indicator color for a neutral solution. Universal indicator turns green in a neutral solution. Drop the next question.