Molecules

A molecule is defined as the ​ (a)   unit of a ​ (b)   that contains the chemical properties of the compound. ​ (c)   are made up of groups of atoms. Describing the structure of an atom, an atom is also sub-divided into smaller units. Protons, electrons, and neutrons are ​ (d)   s of an atom.

• smallest
• compound
• Molecules
• sub-particle
• elements

Molecules may be simple or complex. Here are examples of common molecules:

H₂O (​ (a)   )

N₂ (nitrogen)

O₃ (​ (b)   )

CaO (calcium oxide)

​ (c)   (glucose, a type of sugar)

NaCl (​ (d)   )

• water
• ozone
• C6H12O6
• table salt
• carbon dioxide

Four states of matter exist—solid, liquid, gas, and plasma.

​ (a)   have a definite shape and volume.

​ (b)   have a definite volume, but take the shape of the container.

​ (c)   have no definite shape or volume.

​ (d)   is a form of matter in which many of the electrons wander around freely among the nuclei of the atoms.

• Solids
• Liquids
• Gases
• Plasma
• matter

The ​ (a)   is an instrument for measuring and indicating temperature. The Celsius and Fahrenheit scales use ​ (b)   to measure ​ (c)   . For instance, water boils at ​ (d)   and 212 degrees Fahrenheit. The ​ (e)   does not use degrees. It uses the kelvin, abbreviated K, as a unit of measurement.

• thermometer
• degrees
• temperature
• 100 degrees Celsius
• Kelvin scale

Sucrose is a disaccharide made of glucose and fructose. It's commonly known as “table sugar” but it can be found naturally in fruits, vegetables, and nuts. The chemical or molecular formula for sucrose is C₁₂H₂₂O₁₁.

Each sugar molecule has ______.

• 12 carbon atoms

• 11 oxygen atoms

• 22 hydrogen atoms

• All of the Above

A ​ (a)   is a group of two or more atoms held together by chemical bonds. A ​ (b)   is a substance which is formed by two or more different types of ​ (c)   which are united chemically in a fixed proportion. All ​ (d)   are not compounds. All ​ (e)   are molecules.

• molecule
• compound
• elements
• molecules
• compounds