WorksheetsAtoms, Elements and Compounds
Total questions: 20
Worksheet time: 14mins
Select the correct definition for an atom.
The smallest part of an element that can exist.
A substance made of only one type of atom.
A substance made of more than one type of atom that are chemically bonded together.
A substance made of more than one type of atom that are not chemically bonded together.
Select the correct definition for an element.
The smallest part of an element that can exist.
A substance made of only one type of atom.
A substance made of more than one type of atom that are chemically bonded together.
A substance made of more than one type of atom that are not chemically bonded together.
Select the correct definition for a compound.
The smallest part of an element that can exist.
A substance made of only one type of atom.
A substance made of more than one type of atom that are chemically bonded together.
A substance made of more than one type of atom that are not chemically bonded together.
Elements can be found on the (a) table.
Select the diagram that shows an atom.
Select the diagram that shows an element.
Select the diagram that shows a compound.
Select the elements from this list.
Carbon dioxide
Hydrogen
Nitrogen
Hydrochloric acid
Iron
Select the compounds from this list.
Carbon dioxide
Methane
Nitrogen
Hydrochloric acid
Iron
Select the compounds from this list.
O2
CO2
HCl
CH4
Fe
Select the elements from this list.
O2
CO2
HCl
CH4
Fe
The chemical formula for methane is CH4. How many carbon atoms are in a molecule of methane?
(a)
The chemical formula for carbon dioxide is CO2. How many oxygen atoms are in a molecule of carbon dioxide?
(a)
The chemical formula for water is H2O. How many hydrogen atoms are in a molecule of water?
(a)
The chemical formula for magnesium hydroxide is Mg(OH)2. How many oxygen atoms are in a molecule of magnesium hydroxide?
(a)
The word equation for a reaction is
magnesium + oxygen → magnesium oxide
What are the reactants in this reaction?
Magnesium
Oxygen
Magnesium oxide
oxide
The word equation for a reaction is
sodium hydroxide + hydrochloric acid → sodium chloride + water
What are the products in this reaction?
sodium hydroxide
hydrochloric acid
sodium chloride
water
The symbol equation for a reaction is
2Fe + O2 → 2FeO
What are the products in this reaction?
Fe
O2
FeO
What number is missing to balance the equation?
(a) Cu + O2 → 2CuO
What number is missing to balance the equation?
N2 + (a) H2 → 2NH3
