The properties of a good primary standard solution include the following except?
High molecular mass
low molecular mass
high degree of purity
readily available
Correct answer is B
Properties of a good standard solution
The name of the compound CH\(_3\)C(CH\(_3\))\(_2\)CH\(_2\)CH\(_2\)CH\(_3\)
2 - methyl butane
2,2 - dimethyl butane
2 - methyl pentane
2,2 - dimethyl pentane
Correct answer is D
- The longest chain has five carbon atoms i.e PENT
- with two methyl attached to the second carbon atom
Which of the following compounds has coordinate bonds in its structure?
Al\(_2\)Cl\(_6\)
MgCl\(_2\)
AgCl
NaCl
Correct answer is A
Aluminum chloride (Al2Cl6) has coordinate dative bonding
What is the percentage by mass of H in CH3COOH
1.7%
5.0%
6.7%
7.1%
Correct answer is C
- molecular mass (or molar mass) is 60.05 g/mol
- with 4 atoms of hydrogen present
( 4 / 60 ) X 100
≈6.7%
Stoichiometry is based on the law?
multiple proportion
constant composition
conservation of energy
conservation of mass
Correct answer is D
The principles of stoichiometry are based upon the law of conservation of mass. Matter can neither be created nor destroyed, so the mass of every element present in the product(s) of a chemical reaction must be equal to the mass of each and every element present in the reactant(s).