Chemistry Quiz 4

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.

Wax used for making candles is chemically a mixture of aliphatic hydrocarbons. This means that it's composed of compounds with a carbon backbone and hydrogen atoms that dangle off of the backbone. An aliphatic compound or aliphatic hydrocarbon contains hydrogen and carbon atoms linked together in straight chains.

Petroleum is mainly a mixture of hydrocarbons, i.e. containing only carbon and hydrogen. The most common components are alkanes (paraffins), cycloalkanes (naphthenes), and aromatic hydrocarbons.

Paraffin wax is a colourless soft, solid wax obtained from petroleum, coal or oil shale. It consists of a mixture of hydrocarbon molecules containing between twenty and forty carbon atoms. It's often used in skin-softening salon and spa treatments on the hands, cuticles, and feet.

Flying balloons are filled with a gas lighter than the atmospheric air. Both hydrogen and helium are lighter than air. Hydrogen is even lighter than helium. Hydrogen, however, is not used in balloons because Helium (Noble Gas) is safe and non-reactive which means it is non-combustible.

The purity of gold is expressed in carats. 24 carat is pure gold with no other metals (100-percent gold and 0-percent other metals). Lower caratages contain less gold; 18-carat gold contains 75 percent gold and 25 percent other metals, often copper or silver.

chlorofluorocarbon (CFC) is an organic compound composed of carbon, fluorine, and chlorine. It is used in the manufacture of aerosol sprays, blowing agents for foams and as refrigerants. CFC contributes to the loss of the protective ozone layer, which blocks ultraviolet rays from the sun.

Milk is a natural emulsion in which milk fat is dispersed in water. Emulsion is any mixture of liquids that do not normally mix together, such as oil and water.

Lemon juice and lime juice are rich sources of citric acid. Tamarind (Tamarindus indica) possesses medicinal properties and has higher levels of tartaric acid, sugar, vitamin B, and calcium. The acid which ants produce is called methanoic acid or formic acid.

An element which does not react with oxygen is Helium. The noble metals or inert gas do not react with oxygen. Helium (He), argon (Ar), neon (Ne), krypton (Kr), xenon (Xe), and radon (Rn), etc. are common inert gases.