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WorksheetsChemistry Revision
Total questions: 10
Worksheet time: 5mins
1. An element is a pure substance that contains only one type of ______________________
Atom
Molecule
Compound
Mixture
1. When 2 or more non-metallic atoms bond together, such as water (H20), it is called a _______________________
Element
Compound
Mixture
Molecule
1. When the atoms from two or more different elements are bonded together, such as salt (NaCl), it is called a _______________________.
Atom
Element
Compound
Molecule
1. When two or more different molecules and compounds are found together, not bonded together, it is called a _____________________.
Element
Compound
Molecule
Mixture
What are the reactants in the following equation:
Fe (s) + O2(g) --> FeO (s)
Fe (s) + O2(g)
Fe (s)
O2(g)
FeO (s)
What are the product/s in the following equation:
Fe (s) + O2(g) --> FeO (s)
Fe (s) + O2(g)
Fe (s)
O2(g)
FeO (s)
What does the (g) stand for in the following equation?
Fe (s) + O2(g) FeO (s)
(a)
What does the Fe stand for in the following equation?
1. Fe (s) + O2(g) --> FeO (s)
(a)
A chemical reaction that releases heat (because bonds are broken) is called an _______________ reaction
Exothermic
Endothermic
Catalyst
Titration
A chemical reaction that takes energy (because bonds are made) is called an ________________ reaction
Exothermic
Endothermic
Photosynthesis
Cataclysm
