l only
l and ll only
l and lll only
ll and lll only
Correct answer is C
Three common factors that influence the vapor pressure of a liquid are the surface area, intermolecular forces and the temperature.
The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is
Na3Al(OH)4.
NaAl(OH)4
NaAl(OH)3
Na2Al(OH)3
Correct answer is B
When aluminium is treated with dilute sodium hydroxide it forms a salt called sodium tetrahydroxoaluminate and hydrogen gas.
polar covalent
giant molecular
covalent
ionic
Correct answer is D
Ionic bonds are also formed when there is a large electronegativity difference between two atoms.
The shape of a graphite crystal is
tetrahedral
pyramidal
hexagonal
octahedral
Correct answer is C
Graphite is a crystalline form of the element Carbon. The atoms are arranged in a hexagonal structure.
Which of the following halogens is liquid at room temperature?
Chlorine
Fluorine
lodine
Bromine
Correct answer is D
Bromine is the third lightest halogen. It is a fuming red-brown liquid at room temperature.