Which of the following statements about but-1-ene are true?1 it can form a polymer2 it contains C–C single bonds only3 it conforms to the general formula CnH2n4 it decolourises bromine…

In humans, the water content in the blood is regulated via the hormonal system.Which of the following occur when the water content of the blood is too low?1 pituitary gland…

In a town, the bearing of the library from the station is 𝑥∘. The theatre is due east of the library. The theatre and the station are equidistant from the…

Two rods, X and Y, are made from different electrically insulating materials. A student rubs rod X, which is initially uncharged, with a cloth, then holds it near to rod…

Methanol can be oxidised by hydrogen peroxide to produce carbon dioxide and water.𝐚CH3OH + 3H2O2 → CO2 + 𝐛H2OWhat is the value of 𝐛 when this equation is balanced? Answer:…

Insulin is a protein involved in the regulation of human blood glucose levels. Genetic engineering can be used to allow the large-scale production of human insulin. Which statement describes the…

Given that 4𝑝 × 8𝑞 = 2𝑛, express 𝑛 in terms of 𝑝 and 𝑞. Answer: 4𝑝 × 8𝑞 = (22)𝑝 × (23)𝑞= 22𝑝 × 23𝑞= 22𝑝+3𝑞∴ 𝑛 = 2𝑝…

Which one of the following is a unit of current? Answer: From power 𝑃 = 𝑉𝐼, current 𝐼 = 𝑃 / 𝑉 , so unit (ampere) = watt / voltThe…

Which row in the table correctly explains why an increase in temperature increases the rate of a reaction? Answer: When the temperature of a reaction is increased, the particles gain…