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Chemistry

Chemistry
Atoms having the same number of protons but different number of neutrons are called :

Isotopes
Higgs-boson
Anions
Cations

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Chemistry
The main buffer system of the human blood is

NH2CONH2 - NH2CONH+
H2CO3 - HCO3
CH3COOH - CH3COO-
H2CO3 - CO32-

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Chemistry
Cement is usually a mixture of :

Calcium silicate and calcium aluminate
Lime stone and silicon dioxide
Calcium silicate and calcium ferrate
Calcium aluminate and calcium ferrate

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Chemistry
Alum stops bleeding in minor cuts because of

Coagulation
Dialysis
Emulsion
Solvation

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Chemistry
What is the mass percentage of oxygen in carbon dioxide (CO2)

0.658
0.727
0.305
0.509

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Chemistry
An emulsion is a colloid of a

Gas in a solid
Liquid in a liquid
Gas in a liquid
Liquid in a gas

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