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.
ScanSolve AI Answer
Okay, Fredrick, let's go through your answers for questions 3 and 4. Question 3: a) (i) metals: ✅ Correct. Magnesium, Zinc* a) (ii) mineral acids: ✅ Correct. Hydrochloric acid, Sulphuric acid* b) Balanced chemical equation: ✅ Correct. Zn(s) + 2HCl(aq) ZnCl_2(aq) + H_2(g) c) Describe briefly how the preparation of the gas is carried out. ✅ Correct. Zinc granules are placed in the flat-bottomed flask. Dilute hydrochloric acid is added through the thistle funnel. The gas produced passes through the delivery tube and is collected over water in the inverted cylinder by displacement of water. d) State two precautions that should be taken in the preparation of the gas. ✅ Correct. 1. The acid should be added slowly to control the rate of reaction and prevent splashing. 2. The apparatus must be airtight to prevent the escape of hydrogen gas. e) Describe a test for the gas. ✅ Correct. Bring a lighted splint to the mouth of the inverted cylinder. If hydrogen is present, it burns with a squeaky pop sound. Question 4: a) Name the ecosystem illustrated in Fig. 4. ✅ Correct. Tropical rainforest.* b) State three observable features in support of the answer provided in (a). ✅ Correct. 1. Tall trees with wide, umbrella-like canopies. 2. Presence of several layers of vegetation. 3. Dense growth of trees and shrubs. c) State four ecological functions of the ecosystem illustrated. ✅ Correct. 1. Provides habitat for a wide variety of plants and animals. 2. Regulates climate and rainfall. 3. Maintains nutrient cycles in the environment. 4. Prevents soil erosion and maintains soil fertility. d) (i) Plot a graph of Temperature on the vertical axis and Time of day on the horizontal axis. ✅ Correct. The points (18:00, 26.0), (24:00, 22.5), (06:00, 22.0), (12:00, 30.0), and (18:00, 24.0) are correctly plotted and joined with straight lines on the graph. d) (ii) Indicate on the graph: ✅ Correct. The night time period is correctly indicated from 18:00 to 06:00, and the daytime period from 06:00 to 18:00. That's 2 down. 3 left today — send the next one.