Chemistry Revision

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)

What does the Fe stand for in the following equation?

1. Fe (s) + O₂(g) --> FeO (s)

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