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WorksheetsChemistry revision ( atoms )
Total questions: 33
Worksheet time: 17mins
Compounds are made up of atoms of elements joined to atoms of other elements.
True
False
Sodium chloride is an element.
True
False
Properties of a compound are different from the properties of the elements in it.
True
False
Sodium is a dull metal
True
False
Chlorine is a poisonous gas at 20 ᵒC.
True
False
Calcium is a shiny metal that fizzes in fire.
True
False
Phosphorous is a poisonous solid that catches fire easily
True
False
Oxygen is a colorful gas that helps things burn.
True
False
Carbon monoxide exists as element
True
False
Carbon monoxide consists of one atom of carbon joined to one atom of oxygen.
True
False
Carbon Dioxide exists as molecules.
True
False
Carbon Dioxide consists of two atoms of carbon joined to one atom of oxygen
True
False
Water is an element
True
False
Water consists of two hydrogen atoms and one oxygen atom.
True
False
What is a compound?
(a)
What is the difference between an element and compound?
(a)
Compare the properties of carbon monoxide to the properties of carbon and oxygen.
At 20C. Carbon exists as a solid. Oxygen is a colorless gas we can not live without it. Carbon monoxide is a deadly poisonous gas at 20C
At 30C. Carbon exists as a gas. Oxygen is a colorless gas we can live without it. Carbon monoxide is a deadly poisonous gas at 21C
Name the elements in 1copper sulfide, 2silver bromide, 3aluminum iodide, 4iron sulfate, 5sodium carbonate, 6silicon dioxide.
1 Copper, sulfur, oxygen 2 silver, bromine, oxygen 3 aluminum iodine, oxygen 4 iron, sulfur, oxygen 5 sodium, carbon, oxygen 6 silicon, oxygen
1 Copper, sulfur 2 silver, bromine 3 aluminum iodine 4 iron, sulfur 5 sodium, carbon 6 silicon
Name these compounds KC , ZnO₂ ,SO₃ ,CuSO₄
Potassium chloride, zinc oxide , sulfur dioxide , copper sulfate
Potassium chloride, zinc dioxide , sulfur trioxide , copper sulfate
Which of these formula represent compounds : P₄ , P₂O₅ ,N₂ ,S₈ , CaSO₄ ?
P₄, N₂,S₈
P₂O₅, CaSO₄
an oxide forms when an element join with oxygen.
True
False
Heating chlorine makes sulfur oxide.
True
False
Metal oxides and non-metal oxides have different properties.
True
False
Most metal oxides are acidic.
True
False
Metal oxides are bases.
True
False
A sulfate is made up of two elements-sulfur and oxygen, its formula is SO .
True
False
Carbonate is made up of carbon and sulfur.
True
False
Calcium carbonate CaCO₃, is a harmful building material.
True
False
Salt and water, stones and rice sand and salad are mixtures.
True
False
Mixtures can contain elements, mixtures or both.
True
False
Air is a mixture of nitrogen, oxygen and carbon dioxide.
True
False
Sulfer atoms are the same as iron atoms.
True
False
A chloride is a compound made up of chloride and one other element.
True
False
