distillation
sublimation
precipitation
evaporation
decomposition
Correct answer is B
Sublimation is the transition of a substance directly from the solid phase to the gas phase without passing through the intermediate liquid phase
5cm3
10cm3
20cm3
25cm3
50cm3
Correct answer is E
\(2NaOH + H_{2}SO_{4} = Na_{2}SO_{4} + 2H_{2}O\)
V x 0.5M = 2(10 x 1.25)
0.5V = 2 x 12.5
0.5V = 25
V = \(\frac{25}{0.5}\) = \(50cm^{3}\)
The periodic classification of elements is an arrangement of the elements in order of their
Atomic Weights
Isotopic Weights
Molecular Weights
Atomic Numbers
Atomic Masses
Correct answer is D
Henry Moseley arranged the elements in the periodic table by their atomic number and this gave rise to the statement of the modern periodic law
When sodium chloride and metallic sodium are each dissolved in water
both processes are exothermic
both processes are endothermic
the dissolution of metallic sodium is endothermic
the dissolution of metallic sodium is exothermic
the dissolution of sodium chloride is explosive
Correct answer is D
When small quantities of sodium metal is added to water, there is an exothermic reaction, and they react to form sodium hydroxide and hydrogen.
Basic Oxide
Acidic Oxide
Amphoteric Oxide
Neutral Oxide
Reactive Oxide
Correct answer is C
Zinc oxide is an amphoteric oxide.
- It will dissolve in both acids and alkalis