… in the history of chemistry. It aided scientists to predict elements that existed but not yet found. It helped people to interpret and understand the behavior and physical properties of various elements. The periodic table was developed and improved…

… are generally stable, but some of them are spontaneously transformed by emitting radiations which release energy. This is called radioactivity. Atoms: In nature, matter - whether water, gas, rocks, living beings - consists of molecules, which are combin…

… scientists have been arguing about it for years, but most recent headlines have reignited the simmering debate about therapeutic cloning. Having sent ripples through the scientific and political communities, this issue presents at once radical advantages…

… of a sample of limewater solution in g dm?3. I am required to design my own experiment and choose a range of appropriate equipment and apparatus. The indicator will be supplied to me. I am provided with 250 cm3 of limewater, which has been…

… Ni *<Tab/>Atomic number: 28 *<Tab/>Atomic weight: 58.6934 (2) Minerals containing nickel were of value for colouring glass green. The mineral used for colouring glass was called kupfernickel (false copper).…

… distillation of petroleum is performed to obtain products which are useful for use as solvents, polymer products, road-making materials, lubricants and pharmaceuticals. Products from fractional distillation of petroleum are petrol, kerosene and…

… essentially a business. Like all business, the farmer's aim is to make as large profit as possible. To achieve this, the farmer needs to achieve high yields of the crop(s) which provide the best economic return as efficiently and as cheaply as possible.…

… of these steps determines the rate of the reaction and is called the "rate determining step". A.<Tab/>Rate Expression (or Rate Law) For a given reaction: <Tab/>aA<Tab/>+<Tab/>bB<Tab/&a…

… reaction between magnesium and hydrochloric acid. Mg(s) + 2HCl(aq) MgCl2(aq) + H2(g) Aim: In this experiment I am going observe and record the reaction between magnesium and different concentrations of hydrochloric acid. Prediction: …

… site of disease process Proteins involved in formation of the neuromuscular junction The neuromuscular junction is a specialized junction, where a motor nerve forms its synaptic terminal with a muscle fibre, one of many fibres that make up…