Chemistry Quiz 6

Hydrogen peroxide is an antiseptic frequently used to clean minor cuts or disinfect surfaces. Gargling with hydrogen peroxide may help treat minor mouth irritations, such as cuts or canker sores because it is an antiseptic. In fact, many types of toothpaste and mouthwash in stores already contain this compound.

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.

Saccharin (C₇H₅NO₃S) is made up of Toluene (C₇H₈). It is a zero-calorie artificial sweetener. It is about 200-700 times sweeter than sugar and is commonly used to replace it. It is made in a labouratory by oxidizing the chemicals o-toluene sulfonamide or phthalic anhydride.

The fuel used in an atomic reactor is Uranium. Uranium is the most widely used fuel by nuclear power plants for nuclear fission.

Chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and halons destroy the earth's protective ozone layer, which shields the earth from harmful ultraviolet rays generated from the sun. CFCs and HCFCs also warm the lower atmosphere of the earth, changing global climate.

The density of a gas is directly proportional to pressure and indirectly proportional to temperature. Thus, the density of a gas is maximum at low temperature and high pressure.

Curie point, also called Curie Temperature (T_C) is the temperature at which certain magnetic materials lose their magnetic properties.

The natural source of hydrocarbon is Crude oil. A hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Crude oil is a mixture of hydrocarbons that exists as a liquid in underground geologic formations.

The carbon dating method (carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The carbon dating method is not used to determine the age of rock as it only works for objects that are younger than about 50,000 years, and most rocks of interest are older than that.

When a helium atom loses an electron it becomes a positive helium ion. When an atom gains/loses an electron, the atom becomes charged, and is called an ion. If a neutral atom gains an electron, it becomes negative. This kind of ion is called an anion. If a neutral atom loses an electron, it becomes positive. This kind of ion is called a cation.