Which compound can be used as a reducing agent in a reaction?
Cl2
KMnO4
KCr2O7
MnO2
Na2SO3
Correct answer is E
No explanation has been provided for this answer.
what dose the following equation illustrate? \( ^{238}U_{92} → ^{234}Th_{90} + ^4 He_2 \)
Artificial radioactivity
nuclear fission
nuclear fusion
radio-decomposition
spontaneous disintegration
Correct answer is E
No explanation has been provided for this answer.
The position of an element in the Periodic Table is determined by?
its atomic radius.
its density.
its relative atomic mass.
the number of protons in its atom.
the number of neutrons in its atoms
Correct answer is D
In the modern periodic table, the elements are listed in order of increasing atomic number.
The atomic number is the number of protons in the nucleus of an atom.
Which element contains the greatest number of moles?
8 g of Helium
48 g of Carbon
78 g of Potassium
130g of Zinc
216g of Sliver
Correct answer is B
No explanation has been provided for this answer.
The use of sulphur to vulcanize rubber is mad to make it
blacker
cheaper
more elastic
tougher
softer
Correct answer is D
No explanation has been provided for this answer.