Try this as often as you like. You will get a different set of questions each time you attempt this quiz.
Which substance will not conduct an electric current?
CaO (s)
C (s) (graphite)
NaF (l)
KI (aq)
What is the bond angle in NO3?
120o
107o
109.5o
180o
What are the correct formulas of magnesium nitride and aluminium sulfide?
Mg2N3 and Al2S3
Mg3N2 and Al2S3
Mg2N3 and Al3S2
Mg3N2 and Al3S2
When are ionic bonds most likely to form?
When a metal and a non metal react with each other.
When two elements with high electronegativity values react with each other.
When two metals of different groups react with each other.
When two non metallic elements react with each other.
The formula of tetrachloromethane is CCl4. How many lone pairs of electrons are in its dot cross structure?
12
4
8
12
Which compound contains both ionic and covalent bonds?
NH4Cl
MgCl2
HCl
H2CO
What is the formula for an ionic compound formed between an element, X, from group 2 and an element, Y, from group 6?
XY
X2Y
XY2
X2Y2
What are valence electrons?
Electrons in the highest main energy level
Electrons in the energy level closest to the nucleus
The number of electrons required to complete the highest main energy level
The total number of electrons in the atom
What is the total number of electrons in p orbitals in an atom of iodine?
23
5
7
17
Which compound has the least covalent character?
NaCl
SiO2
Na2
MgCl2
Which one of the following compounds dissolves in water to form a solution that does not conduct electricity?
CH3CH2OH
HCl
NaCl
CH3COOH
What intermolecular forces are present in gaseous hydrogen?
Van der Waals’ forces
Hydrogen bonds
Covalent bonds
Dipole-dipole attractions
What happens when sodium and oxygen combine together?
Each sodium atom loses one electron.
Each sodium atom gains one electron.
Each oxygen atom gains one electron.
Each oxygen atom loses one electron.
In ethanol, C2H5OH(l), there are covalent bonds, hydrogen bonds and van der Waals forces. Which bonds or forces are broken when ethanol is vaporized?
Hydrogen bonds and Van der Waals forces
Only hydrogen bonds
Covalent bonds and hydrogen bonds
Covalent bonds and Van der Waals forces
Which one of the following statements is correct about multiple bonding between carbon atoms?
π bonds are weaker than sigma bonds.
Double bonds are formed by two π bonds.
Double bonds are weaker than single bonds.
π bonds are formed by overlap between s orbitals.
Which one of the statements about sigma and pi bonds is correct?
Sigma bonds are formed by either s or p orbitals, pi bonds are formed only by p orbitals.
Sigma bonds are formed only by s orbitals and pi bonds are formed only by p orbitals.
Sigma bonds are formed only by p orbitals and pi bonds are formed only by s orbitals.
Sigma and pi bonds are formed by either s or p orbitals.
Which one of the following molecules is linear?
CO2
SO2
H2S
Cl2O
Why is the boiling point of PH3 lower than that of NH3?
NH3 is hydrogen bonded, while PH3 is not hydrogen bonded.
PH3 is non-polar, while NH3 is polar.
The Van der Waals' forces are weaker in PH3 than in NH3.
The molar mass of PH3 is greater than that of NH3.
Which one of the following molecules is non-polar?
SO3
NF3
CHCl3
H2CO
Atoms of nitrogen and element X form a bond in which the electrons are shared equally. Element X could be
chlorine
carbon
oxygen
phosphorous
Which is the correct description of polarity in F2 and HF molecules?
Only one of the molecules is polar.
Both molecules contain a polar bond.
Neither molecule contains a polar bond.
Both molecules are polar.
Which of the following substances is made up of molecules containing polar covalent bonds?
Water
Calcium oxide
Chlorine
Sodium bromide
Which of the following pairs of elements combine to form an ionic compound?
Lead and fluorine
Sulphur and oxygen
Carbon and nitrogen
Phosphorus and chlorine
The shapes and names of some molecules are shown below. Phosphine is a compound of phosphorus and hydrogen. The shape of a molecule of phosphine is likely to be
pyramidal
tetrahedral
bent
linear
A covalent bond would be expected to form between atoms which have the electron configurations
2,8,1 and 2,8,7
2,7 and 2,6
2,8,8 and 2
2,8,5 and 2,8,8,1
What would be the chemical formula of the compound formed between magnesium and nitrogen?
Mg3N2
Mg2N3
Mg2N
MgN
Two neutral atoms, L and M, have the electron configurations shown below: L: 2,8,5 M: 2,8,7 Which one of the following describes the bonding and gives the formula of the compound most likely formed when L and M combine?
Covalent; LM3
Covalent; L3M
Ionic; L2M5
Ionic; L7M5
For a covalent bond to be non-polar, the bonding atoms must have the same