Quiz # 13



#1 Baryllium Sulphate is less soluble in water due to

Baryllium sulfate (BeSO4) is a white crystalline solid. It was first isolated in 1815 by Jons Jakob Berzelius. Beryllium sulfate may be prepared by treating an aqueous solution of any beryllium salt with sulfuric acid, followed by evaporation of the solution and crystallization. The hydrated product may be converted to anhydrous salt by heating at 400°C. Baryllium
Sulphate is less soluble in water due to High inflammable energy.

#2 What is the name of that system, which uses radioactivity to decide the period of materials of-pre-historic period ?

Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method thatuses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years.

#3 Cement is made hard with

Cements (e.g., Portland cement) harden because of hydration, chemical reactions that occur independently of the mixture’s water content; they can harden even underwater or when constantly exposed to wet weather. The chemical reaction that results when the anhydrous cement powder is mixed with water produces hydrates that are not watersoluble.

#4 What happens when a chemical bond is formed ?

If a bond is broken, energy is released; and if a bond is formed, energy must have been absorbed.

#5 Which among the following is a carbohydrate ?

Cane-sugar is carbohydrate and as this name implies, is composed of carbon, hydrogen and oxygen. it is a source of extracting sugar. There are various types of sugar derived from different sources. Simple sugars are called monosaccharides and include glucose, fructose and galactose. The table or granulated sugar most customarily used as food is sucrose, a disaccharide. Other disaccharides include maltose and lactose.

August 22, 2019

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