WorksheetsChemistry
Total questions: 13
Worksheet time: 15mins
In the chromatography experiment shown, which label represents the solvent front?
A
B
C
D
A mixture of ethanol and methanol is separated by fractional distillation. This method of separation depends on a difference in property X of these two alcohols. What is property X?
A. Boiling point
B. Solubility
C. Colour
D. Melting point
Which change of state takes place during evaporation?
A. Solid to gas
B. Gas to liquid
C. Liquid to gas
D. Liquid to solid
Which element is a halogen?
A. Sodium
B. Magnesium
C. Chlorine
D. Neon
Isotopes of the same element have:
A. Different numbers of protons
B. Different chemical properties
C. Different numbers of neutrons
D. Different atomic numbers
An atom contains 17 protons and 18 neutrons. What is its nucleon number?
A. 17
B. 18
C. 35
D. 36
A mixture contains sand, salt and water. Which sequence would produce pure salt?
A. Distillation → Filtration
B. Filtration → Evaporation
C. Chromatography → Filtration
D. Evaporation → Filtration
Which group contains the noble gases?
A. Group 1
B. Group 7
C. Group 8
D. Group 2
Elements in the same group of the periodic table have the same number of:
A. Protons
B. Neutrons
C. Electron shells
D. Outer-shell electrons
Which particle has a positive charge?
A. Electron
B. Neutron
C. Proton
D. Nucleus
Which statement indicates that a substance is pure?
A. It has a fixed melting point.
B. It contains two elements only.
C. It cannot dissolve in water.
D. It has a colourless appearance.
Draw the electron arrangement for magnesium atom with 12 protons, 12 electrons and 12 neutrons.
An atom above contains 20 protons, 20 electrons and 22 neutrons.
State:
a) Atomic number
b) Nucleon number
(a)
(b)
