The iron has a relatively low melting point because it contains impurities
It is not dissolves directly in water because the heat evolved during the process would cause the acid solution to boil, producing a mist of acid droplets which would spread throughout the factory
It is regarded as a heavy chemical because it is produced in very large quantities and used in many chemical processes
I : Displacement reaction
II : As an oxidizing agent
The aim of the fountain experiment is to prove that HCI is highly soluble in water.
The experiment consists of introducing water through an inlet to a container filled with ammonia gas. Ammonia dissolves into the water and the pressure in the container drops. As a result, more water is forced into the container from another inlet creating a fountain effect. In other words the water turns red.
(i)Limescale (a hard crust) forms inside kettles.
(ii)This wastes energy whenever you boil a kettle. It helps to reduce heart disease.
The relationship between the compounds A and B is that they have similar chemical properties
– A : Trans-1,2-dichloroethene
– B : Cis-1,2-dichloroethene
Their chemical properties will be the same
The reason is because they are geometric isomers. Geometric isomers have the same chemical properties but different physical properties.
(i)Temperature remains constant during boiling
(ii)There is change of state during boiling
(i)It increase the boiling point of water
(ii)It reduce the boiling point of water
(i)Boiling occurs at a specific temperature while evaporation occurs at almost all temperature.
(ii)during boiling temperature remains constant while during evaporation temperature changes
An unsaturated solution is one that contain less than the maximum amount of solute that can dissolve at a given temperature while saturated solution is one that contain maximum amount of solute that can be dissolved in it at that temperature
(i)By increasing the temperature of the solution
(ii)Increasing the amount of solute
Mole is the amount of substance that contains as many elementary particles or entitle as there are carbon atoms in 12 Grammies of carbon – 12 isotope
MgO(s) + 2HCl(aq)—->MgCl²(aq)+H2O(I)
1mole of MgO neutralize 2 mole of HCl
Reacting mole of HCl = 25.0*0.1/1000=0.0025mole
No of moles of MgO =0.0025/2 =0.00125mole
But mole =mass/m. Mass , mass = mole*m. Mass
Molar mass of MgO =24+16=40g/mol
Mass of MgO =40*0.00125=0.05g
(i)They have high melting and boiling point
(ii)They hard but brittle with high tensile strength
(iii)They are good conductors of heat and electricity
(iv)They are malleable
Faraday’s First Law of Electrolysis states that the chemical deposition due to the flow of current through an electrolyte is directly proportional to the quantity of electricity (coulombs) passed through it.
Strong electrolytes ionize completely (100%), while weak electrolytes ionize only partially.
CHEMICAL PROPERTY OF EHYNE
– COMBUSTION REACTION: Ethyne burns in air with a luminous smoky flame and hence used for lightening purpose.
2C2H2 + 5O2 —–> 4CO2 + 2H2O + heat
Unsaturated hydrocarbons are hydrocarbons that have double or triple covalent bonds between adjacent carbon atoms.
CH3COOH + CH3OH–>CH3COOCH3 + H2O
By removing the main product continuously.
Mzn = 3.75g
Mzn = 65.0g/mol
nH² =0.0577mole because the mole ratio is the same
Zinc (from + 2 to + 4)
(i)Each spectral line is caused by one electron
(ii)Electron can exist only in circular orbit of definite quantum energy.
It could not account for the spectrum at note complicated atoms
(i)Temperature of the reacting system
(ii)Pressure of the reacting system
(iii)Concentration of the reacting system
Both liberate carbon(iv) oxide
One produce a chloride salt , the other produce an ethronate salt
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