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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Fresh day NLE, let's solve. 1. Instruments for physical measurements (Fig. 1) a) Identify each of the instruments labelled A, B, C, D and E. A: Measuring cylinder* (or Graduated cylinder) B: Pipette* C: Volumetric flask* D: Thermometer* E: Hydrometer* b) State one (1) use of each of the following instruments A, B, C, D and E. A: Used to measure the volume of liquids*. B: Used to accurately transfer a specific volume of liquid*. C: Used to prepare solutions of a precise volume and concentration*. D: Used to measure temperature*. E: Used to measure the relative density* (or specific gravity) of liquids. c) Describe how instrument B is used. Step 1: Use a pipette filler to draw the liquid into the pipette, ensuring the liquid level is above the calibration mark. Step 2: Carefully release the liquid until the bottom of the meniscus aligns precisely with the calibration mark. Step 3: Transfer the measured volume of liquid by allowing it to drain into the receiving vessel. 2. Illustration of a half flower (Fig. 2) a) Identify the parts labelled I, II, III, IV, V, VI and VII. I: Sepal* II: Petal* III: Anther* IV: Stigma* V: Ovary* VI: Filament* VII: Style* b) State the function of the parts labelled III, IV and V. III (Anther): Produces and contains pollen grains*. IV (Stigma): Serves as the receptive surface for pollen during pollination*. V (Ovary): Contains the ovules* and develops into the fruit after fertilization. c) i) Name the male part of the flower. The male part of the flower is the stamen, which consists of the anther (III) and the filament (VI). c) ii) Name the female part of the flower. The female part of the flower is the pistil (or carpel), which consists of the stigma (IV), style (VII), and ovary (V). d) State two (2) differences between wind-pollinated flowers and insect-pollinated flowers. Wind-pollinated flowers typically have small, inconspicuous petals, no scent, no nectar, and produce large amounts of light, smooth pollen. Their stigmas are often large and feathery to catch airborne pollen. Insect-pollinated flowers usually have large, brightly colored petals, produce nectar and scent to attract insects, and have sticky or rough pollen grains. Their stigmas are often sticky to ensure pollen adheres. What's next? 📸