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
Here's the solution for Item 4: a) Determine the volume of air in the soil sample. Step 1: Calculate the total volume if there were no air in the soil. Initial combined volume = Volume of soil used + Volume of water added Initial combined volume = 40 cm^3 + 50 cm^3 = 90 cm^3 Step 2: Determine the volume of air. The difference between the initial combined volume and the final volume represents the volume of air displaced by water. Volume of air = Initial combined volume - Final volume of water + soil after mixing Volume of air = 90 cm^3 - 80 cm^3 = 10 cm^3 The volume of air in the soil sample is 10 cm^3. b) Calculate the percentage of air in the soil sample. Step 1: Use the formula for percentage of air. Percentage of air = Volume of airVolume of soil used × 100\% Percentage of air = 10 cm^340 cm^3 × 100\% Percentage of air = 0.25 × 100\% = 25\% The percentage of air in the soil sample is 25\%. In another investigation, 80g of a fresh soil sample was heated in a crucible. After repeated heating and cooling, the constant mass of the soil was found to be 65g. Calculate the percentage of water in the soil sample and explain the factors that affect the water content of a given soil. Step 1: Calculate the mass of water in the soil sample. Mass of water = Mass of fresh soil - Mass of dry soil Mass of water = 80 g - 65 g = 15 g Step 2: Calculate the percentage of water in the soil sample. Percentage of water = Mass of waterMass of fresh soil × 100\% Percentage of water = 15 g80 g × 100\% Percentage of water = 0.1875 × 100\% = 18.75\% The percentage of water in the soil sample is 18.75\%. Factors that affect the water content of a given soil: • Soil texture: The proportion of sand, silt, and clay particles determines pore size and surface area, influencing how much water the soil can hold and how quickly it drains. Clay soils generally retain more water than sandy soils. • Organic matter content: Organic matter acts like a sponge, significantly increasing the soil's water-holding capacity. • Soil structure: The arrangement of soil particles into aggregates affects pore space distribution, influencing water infiltration and retention. • Climate: Factors like rainfall, temperature (affecting evaporation), and humidity directly impact the amount of water present in the soil. That's 2 down. 3 left today — send the next one.