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WorksheetsScience 9 Review Test
Total questions: 20
Worksheet time: 10mins
The negatively charged sub-atomic particles are called what?
Atom
Proton
Neutron
Electron
Who proposed the planetary model of the atom?
Ernest Rutherford
John Dalton
Neils Bohr
J.J. Thomson
The energy of electrons is the main determinant of what property in atoms?
The location of the electron
The interaction between electrons
Both a and b
Neither of the two
When Calcium combines with Chlorine, it loses two electrons. What could be the charge of Calcium after losing 2 electrons?
+2
-2
-1
+1
Which of the following orbitals can hold up to 6 electrons?
s
p
d
f
Which of the following elements have the electron configuration of 1s2 2s2 2p6 3s2 3p6 4s2?
Mn
F
S
Ca
Which electron configuration of an element is incorrect?
B5: 1s2 2s2 2p2
Cl7: 1s2 2s2 2p6 3s2 3p5
Na11: 1s2 2s2 2p6 3s1
Ne10: 1s2 2s2 2p6
Element with the electron configuration 1s2 2s2 2p6 3s2 3p6
Ar
Ca
O
P
Among the sub-levels below, which is not designated properly?
3d10
5f18
2p6
1s2
What is the electron configuration of Oxygen?
1s2 2s2 2p4
1s2 2s2 2p2
1s2 2s2 2p2 2p2
1s2 2s2 2p1
Which of the following statements is not true?
Electrons that are far from the nucleus have a greater energy than those electrons near the nucleus.
Energy level is always equal to the number of sublevels in the atom.
When two bent electrons interact, they tend to repel.
D orbitals can have only 1 electron.
Which of the following is an example of a compound with strong conductivity?
Acetic Acid
Ammonium hydroxide
Sodium chloride
Sucrose
Which of the following cannot be considered in checking the physical properties of compounds?
Ability
Conductivity
Hardness
Solubility
This property of a substance can also be used to determine its purity.
Conductivity
Hardness
Melting point
Solubility
Which is one of the physical properties of covalent molecular substances?
Conductors
Emitters
Non-conductors
Non-emitters
When table sugar is heated, what happens to the atoms in each table sugar molecule?
The atoms in each table sugar molecule remain intact.
The atoms in each table sugar molecule move apart.
The atoms in each table sugar molecules melt.
The atoms in each table sugar molecules stay heated.
Table salt (Sodium chloride) is solid at room temperature. This compound does not conduct electricity unless dissolved in water. Why?
The charged particles of salt are released when it is dissolved in water.
The particles of salt have no charge, but water is an electrical conductor.
The particles of table salt gain negative charge as they are mixed with water.
The particles of table salt gain positive charge when they are dissolved in water.
What do you call the negatively charged particle of an atom?
electron
molecules
neutron
proton
It is an atom that gains or loses electrons.
corrosive
ion
isotopes
radioactive
It is the attraction between atoms, ions or molecules that enables the formation of chemical compounds.
chemical bond
hydrogen bond
intermolecular force
radioactivity
