Chemistry Online Quiz

Fibreglass is used for making glass-reinforced plastic (GRP). The fibres are usually glass, carbon, aramid, or basalt. Rarely, other fibres such as paper, wood, or asbestos have been used. It is strong, extremely light and highly versatile.

In diamonds, all carbon atoms are quaternary in nature. A quaternary carbon is a carbon atom bound to four other carbon atoms. Diamond has a giant covalent structure in which each carbon atom is bound to four other carbon atoms by covalent bonds.

Gobar gas (Biogas) contains mainly methane. It is a mixture of gases, primarily consisting of methane, carbon dioxide and hydrogen sulphide, produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste and food waste. It is a renewable energy source.

The chemical name of Gypsum is calcium sulphate dihydrate (CaSO₄⋅2H₂O). Milk of lime is the common name for saturated calcium hydroxide solution (Ca(OH)₂). Glauber's salt is the common name for sodium sulphate decahydrate (Na₂SO₄·10H₂O). Saltpeter is one name for the compound called potassium nitrate, which has the chemical formula KNO₃.

Seawater can be purified by the process of distillation. Distillation is a phase separation method whereby saline water is heated to produce water vapor, which is then condensed to produce fresh water.

When a gas is expanded from a high-pressure region to a low-pressure region; temperature change occurs. This phenomenon is related to the Joule-Thomson effect. The inversion temperature of hydrogen is low thus it shows heating effect (increase in temperature) when it expands adiabatically from high pressure into a region of low pressure.

Water hyacinth (Eichhornia crassipes) is used for cleansing polluted water bodies owing to its remarkable capacity of absorbing pollutants.

Silver halides are used in photographic plates because they are reduced by light. Silver halides are photosensitive as they react with light to form the image. A silver halide is a compound of silver and a halogen; for example, silver bromide (AgBr), silver chloride (AgCl), silver fluoride (AgF), and silver iodide (AgI).

Cement is usually a mixture of calcium silicate and calcium aluminate. cement is a powdery substance made with calcined lime and clay as major ingredients. The clay used provides silica, alumina, and iron oxide, while calcined lime basically provides calcium oxide.

Candle is a mixture of Paraffin wax and stearic acid. Paraffin wax (C_nH_2n+2) is a white or colourless soft, solid wax. It's made from saturated hydrocarbons. Stearic acid, another name for octadecanoic acid CH₃(CH₂)₁₆COOH, is one of the most common fatty acids.