Chemistry

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Chemistry -One Liners

1-Action of phosphoric acid on rock phosphate produces phosphoric acid

2-What is the name given to the electrons in the highest occupied energy level of an atom ? -Ans- valence electrons

3-What type of bonding does NaCl have ? -Ionic

4-Temperature and pressure in ammonia converter is 450 atm, 550°C

5-Fusion zone in the electric furnace used for reduction of phosphate rock to elemental phosphorous is maintained at 1400-1450 °C.

6-Gasoline extracted from natural gas (by compression and cooling) is called the unleaded gasoline.

7-When H+forms a bond with H2 O to form the hydronium ion H3O+ , this bond is called a coordinate covalent bond because both bonding electrons come from the oxygen atom

8-Reaction of orthophosphoric acid with phosphate rock produces triple superphosphate

9-The relative numbers of atoms of each kind in any chemical compound (using atomic symbols and subscripts) is known as a chemical formula

10-The melting points of molecular compounds are usually lower than those of ionic compounds

11-What causes hydrogen bonding ? -Ans- bonding of a covalently bonded hydrogen atom with an unshared electron pair

12-The model for metallic bonding is known as the electron sea model

13-The formula for potassium sulfide is K2S

14-What is the name of the ionic compound formed from lithium and bromine ? -Ans- lithium bromide

15-Lower temperature and large excess of ammonia in urea melt decreases biuret formation

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