Element Y forms an ion Y 3- with the electronic configuration 2, 8, 8.To which group and period of the periodic table does Y belong? Answer: 2) C The (-3)…

Which one of the following involves active transport? A movement of carbon dioxide into alveoli in the lungsB uptake of alcohol (ethanol) through the lining of the stomachC secretion of…

A car of mass 800kg moves up an incline of 1 in 20 (1 in 20 means for every 20m along the road the car gains 1m in height) at…

Cyclohexene, C6H10, is drawn as: Apply this information for the steroid-type structure shown below to find the total number of carbon atoms in the molecule. Answer: 26) B The first…

The hormonal and nervous systems are often compared because of their similar roles in thebody. Which of the following statements about the two systems are true? 1 The nervous system…

A design is set up by joining the points which are one third of the way along the sides of a square. This forms a second square as shown. This…

In an ornamental fountain, water is squirted vertically upwards through a nozzle by a pump. 5kg of water pass through the nozzle each second, and the water reaches a height…

A student prepared nitrobenzene by the following reaction.C6H6 + HNO3 → C6H5NO2 + H2Obenzene nitrobenzeneStarting with 3.9g of benzene, the student obtained 3.69g of nitrobenzene.What is the percentage yield?(Ar :…

The following statements are about nuclear division by meiosis and mitosis.1 In animals meiosis only occurs in the reproductive organs.2 Mitosis can result in the formation of clones.3 Meiosis results…

The total surface area of a cylinder is numerically the same as its volume. The radius of the cylinder is r cm, the height is h cm. Express h in…