Concept 1 - Stability and bonding

What is a compound?

• A single element found in nature

• A mixture of two or more elements that are not chemically combined

• Two or more elements chemically combined

• A natural resource found in the earth

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How do the properties of a compound compare to the properties of the elements that make it up?

• The properties of a compound are the same as the properties of the elements that make it up

• The properties of a compound are slightly different from the properties of the elements that make it up

• The properties of a compound are very different from the properties of the elements that make it up

• The properties of a compound are only different in a chemical reaction

Which of the following is an example of a compound?

• Na (Sodium)

• Cl (Chlorine)

• NaCl (Sodium Chloride)

• O2 (Oxygen)

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What is the purpose of a chemical formula?

• To determine the physical properties of a compound

• To tell what elements and how many of each element are in a unit of a compound

• To describe the color of a compound

• To explain the chemical reactions a compound can undergo

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What does the chemical formula H2O represent?

• Ammonia

• Hydrogen peroxide

• Water

• Hydrochloric acid

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How many atoms of hydrogen are there in a molecule of water (H2O)?

• 1

• 2

• 3

• 4

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What does the chemical formula NH3 represent?

• Methane

• Nitrous oxide

• Ammonia

• Nitric acid

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How many atoms of hydrogen are present in a molecule of ammonia (NH3)?

Mathematical Equivalence

ON

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How many atoms of nitrogen are present in a molecule of ammonia (NH3)?

• 1

• 2

• 3

• 4

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Why do elements form compounds?

• To increase their atomic number

• To be stable

• To create new elements

• To decrease their mass

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