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…

Before a cell can divide by mitosis, DNA synthesis has to take place. Following DNA synthesis, the DNA is separated into each half of the cell and then the cell…

Simplify:𝑥 2 −4𝑥𝑥 2 −16 Answer:𝑥 2 −4𝑥𝑥 2 −16 = 𝑥(𝑥−4)(𝑥+4)(𝑥−4) = 𝑥(𝑥+4)The answer is B