Graphene is a new material composed of carbon atoms arranged in tightly bound hexagons just one atom thick.The diagram shows a simplified structure of graphene.Considering its structure, which of the…

In order to function, the cells of the brain need large amounts of energy. Any reduction in thefunction of these cells can have serious consequences for the body. For example,…

The diagram shows part of a glass structure. PQRS is a horizontal square with sides of 1 metre, and point X is 4 metres vertically above P. What is the…

The displacement / time graph shown represents a wave of wavelength 1.5 cm. What is the speed of the wave? Answer: Period = 2.0 s so frequency = (1 /…

An organic compound is found to contain 6 parts of carbon, 1 part of hydrogen and 8 parts ofoxygen by mass.6 g of a gaseous sample of the compound would…

Which of the following statements about lipid digestion in the small intestine is / are correct?1 Emulsification by bile makes smaller lipid droplets, each with a smaller surface area.2 Bile…

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…