Chemistry Quiz 2

Oxyacetylene flame is commonly known as gas welding. It is a process which relies on combustion of oxygen and acetylene. When mixed together in correct proportions within a hand-held torch or blowpipe, a relatively hot flame is produced with a temperature of about 3200°C.

Polyvinyl chloride also known as PVC is obtained by the polymerisation of vinyl chloride. Vinyl chloride is an organochloride with the formula H₂C=CHCl that is also called vinyl chloride monomer (VCM) or chloroethene.

The temperature of the oxy-acetylene flame is around 3200°C. Oxy-acetylene welding, commonly referred to as gas welding, is a process which relies on combustion of oxygen and acetylene. When mixed together in correct proportions within a hand-held torch or blowpipe, a relatively hot flame is produced with a temperature of about 3200°C.

The metal, which is a constituent of vitamin B₁₂ is Cobalt. Cyanocobalamin (commonly known as Vitamin B₁₂) is a highly complex, essential vitamin, owing its name to the fact that it contains the mineral, cobalt.

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.

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.

Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. Silicon is the most common semiconductor material used in photovoltaic panels.

A balloon filled with helium rises in the air because helium is less dense (lighter) than air. Helium floats because its molecules are lighter than the nitrogen and oxygen molecules of our atmosphere and so they rise above it.

¹⁴C₆ is used in dating archaeological findings up to about 60,000 years old. Radiocarbon dating (carbon-14 dating) is a method used for dating archaeological findings by using the properties of radiocarbon (¹⁴C₆), a radioactive isotope of carbon.

Glass is a supercooled liquid. When glass is made, the material (often containing silica) is quickly cooled from its liquid state but does not solidify when its temperature drops below its melting point. At this stage, the material is a supercooled liquid, an intermediate state between liquid and glass.