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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You're on a roll — Here are the answers to questions 7 and 8: 7. a) Write the ionic forms of the following elements: i) Sodium (Na): Na^+ ii) Calcium (Ca): Ca^2+ iii) Aluminium (Al): Al^3+ iv) Oxygen (O): O^2- v) Magnesium (Mg): Mg^2+ b) i) State three (3) differences between macro nutrients and micro nutrients as used in crop production. Quantity Required: Macronutrients are required by plants in large quantities, while micronutrients are needed in trace amounts*. Role in Plant: Macronutrients form the bulk of plant tissue and are involved in major physiological processes, whereas micronutrients act primarily as cofactors for enzymes* and catalysts. Examples: Macronutrients include Nitrogen (N), Phosphorus (P), Potassium (K), Calcium (Ca), Magnesium (Mg), Sulfur (S). Micronutrients include Iron (Fe), Manganese (Mn), Zinc (Zn), Copper (Cu), Boron (B), Molybdenum (Mo), Chlorine (Cl), Nickel (Ni). b) ii) Give one (1) example each of macro nutrient and micro nutrient. Macro nutrient: Nitrogen (N)* Micro nutrient: Iron (Fe)* c) i) State three (3) reasons why alloys are preferred to pure metals. Increased Strength/Hardness: Alloys are generally stronger and harder* than their constituent pure metals. For example, steel (an alloy of iron and carbon) is much stronger than pure iron. Corrosion Resistance: Many alloys exhibit better resistance to corrosion* compared to pure metals. Stainless steel, for instance, is more resistant to rust than pure iron. Improved Properties: Alloys can have enhanced properties* like higher melting points, better ductility, or improved electrical conductivity, depending on the specific combination of metals. c) ii) Differentiate rusting from corrosion. Corrosion is the general process of deterioration of a material* (usually a metal) due to chemical reactions with its environment. It can affect various materials and involve different chemical reactions. Rusting is a specific type of corrosion that applies only to iron and its alloys* (like steel). It is the formation of iron oxides (specifically hydrated iron(III) oxides) in the presence of oxygen and water. d) Explain the following terms as used in seed germination: i) Hypogeal germination: This is a type of seed germination where the cotyledons remain below the soil surface*. The epicotyl (part of the stem above the cotyledons) elongates, pushing the plumule (embryonic shoot) above ground, while the cotyledons stay underground, providing nourishment to the seedling. ii) Epigeal germination: This is a type of seed germination where the cotyledons are pushed above the soil surface* by the elongation of the hypocotyl (part of the stem below the cotyledons). The cotyledons then turn green and function as the first leaves, performing photosynthesis until the true leaves develop. 8. a) State four (4) importance of cover cropping in crop production. Soil Erosion Control: Cover crops help prevent soil erosion* by wind and water, as their roots hold the soil in place and their foliage protects the soil surface. Weed Suppression: They suppress weed growth* by competing for light, water, and nutrients, reducing the need for herbicides. Soil Fertility Improvement: Leguminous cover crops fix atmospheric nitrogen*, enriching the soil, while others add organic matter, improving soil structure and nutrient retention. Pest and Disease Management: Some cover crops can disrupt pest life cycles* or host beneficial insects, contributing to integrated pest management. b) State two (2) uses of each of the following: i) Metals: Used in construction* (e.g., steel in buildings, aluminum in frames). Used in electrical wiring* (e.g., copper due to its high conductivity). ii) Non-metals: Used in fertilizers* (e.g., nitrogen, phosphorus, sulfur). Used as insulators* (e.g., rubber, plastic in electrical applications). c) State four (4) ways of controlling mosquitoes in the community. Eliminate Breeding Sites: Remove stagnant water* from containers, old tires, clogged gutters, and other areas where mosquitoes lay eggs. Use Insecticides/Larvicides: Apply approved insecticides* to kill adult mosquitoes and larvicides to kill mosquito larvae in water bodies. Install Screens and Nets: Use window and door screens* and mosquito nets (especially insecticide-treated nets) to prevent mosquitoes from entering homes. Biological Control: Introduce natural predators* like certain fish species (e.g., Gambusia) that feed on mosquito larvae in ponds and water bodies. d) Give four (4) measures that can be taken to minimize the negative impact of gold extraction on the Ghanaian environment. Reclamation of Mined Land: Implement strict policies for rehabilitating and re-vegetating mined-out areas* to restore ecosystems and prevent soil erosion. Responsible Waste Management: Ensure proper disposal and treatment of tailings and chemical waste* (e.g., cyanide) to prevent contamination of soil and water bodies. Water Management and Treatment: Implement systems for treating wastewater* from mining operations before discharge to remove heavy metals and other pollutants. Promote Sustainable Mining Practices: Encourage the use of environmentally friendly mining technologies* and reduce reliance on harmful chemicals like mercury in artisanal mining. Got more? Send 'em.