Which of the following substances is an example of a fine chemical?
Sodium hydroxide
Hydrochloric acid
Ethylene
Ammonia
Correct answer is B
- Fine chemicals are complex, single, pure chemical substances, produced in limited quantities.
- Heavy chemicals are produced and handled in large lots and are often in a crude state.
- Some examples of heavy chemicals are ammonia, sulfuric acid, and sodium hydroxide.
Kipps apparatus can be used to prepare?
H\(_2\)
NH\(_3\)
O\(_2\)
H\(_2\)S
Correct answer is D
Kipp's apparatus is a laboratory apparatus specially designed for producing small amount of gases and is used to produce usually hydrogen sulfide.
The group to which elements belong in the periodic table is determined by the number?
electrons
core electrons
valence shells
valence electrons
Correct answer is D
This periodic table shows the valences of element groups.
Which of the following methods is NOT used for the separation of mixtures?
Chromatography
Crystallization
Distillation
Electrolysis
Correct answer is D
Uses of electrolysis:
i and ii only
ii and iv only
iii and iv
i, ii, iii and iv
Correct answer is B
The method of collecting a gas produced by a chemical reaction will depend on its solubility and its density.