Electrons enter into orbitals in order of increasing energy as exemplified by?
1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^0\)
1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^1\)2pz\(^1\)3s\(^0\)
1S\(^2\)2S\(^2\)2PX\(^1\)2py\(^1\)2pz\(^1\)3s\(^1\)
1S\(^2\)2S\(^2\)2PX\(^2\)2py\(^2\)2pz\(^0\)3s\(^1\)
Correct answer is B
Shells and subshells are filled in energy level order, so electrons will fill the 2p subshell before the 3s shell.
And the x subshell before the y and z.
H\(^+\) + OH\(^-\) → H\(_2\)O The equation above illustrates
precipitation
hydration
hydrolysis
neutralization
Correct answer is D
A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H+ ions and OH- ions to generate water.
Which of the following best represent solid gas mixture?
milk
kerosene
soil
smoke
Correct answer is D
Solid in gas mixture: Smoke, ice clouds, dust.
Liquid in gas mixture: fog, mist, vapour and hair sprays.
Gas in solid mixture: aerogel, Styrofoam.
The dehydration of CH\(_3\)CH\(_2\)CH\(_2\)CH\(_2\)OH will give?
HC≡CCH\(_2\)CH\(_3\)
CH\(_2\)≡CH\(_2\)CH\(_3\)
CH\(_3\)C≡CCH\(_3\)
CH\(_3\)CH=CHCH\(_3\)
Correct answer is D
An alkene is produced when dehydration of alcohol is performed. Alcohol dehydration is an example of an elimination reaction which is quite the opposite of substitution reaction and addition reaction.
The products of the dehydration of a primary alkanol are water and an alk-1-ene (1-alkene).
Butanol gives a mixture of but-1-ene and but-2-ene when dehydrated.
The pollutant usually presents in a city which generates its electricity from coal?
fog
carbon(ii)oxide
smog
sulphur(iv)oxide
Correct answer is D
In the majority of power plants, sulfur appears due to coal burning which is used to generate electricity.