Lesson for Reading - Unit 16

a substance or product that can be traded, bought, or sold

• energy

• commodity

• purpose

• petroleum

a soft substance that is like a wet powder and consists of very small pieces of a solid material that have fallen to the bottom of a liquid:

• unification

• oxidation

• sediment

• condenser

He works for a company that ______ car parts

Several police officers are being questioned about the ________ of the documents.

• changing

• alteration

• alters

• altering

_______ are removed from the blood by the kidneys.

• Impurities

• Pure

• Purity

• Pured

to use a substance such as oil to make a machine or device operate more easily, or to prevent something sticking or rubbing:

• Lubricate
• Smoothify
• Slippery
• Grease

Applying a few drops of oil on a key will clean and _______the moving parts of the lock, extending its life.

the smallest unit of any chemical element, consisting of a positive nucleus surrounded by negative electrons.

• Particle
• Compound
• Molecule
• Atom

the act or process of bringing together or combining things or people:

• Unification

• Division
• Separation
• Aggregation

something consisting of two or more different parts

• compound
• element
• single
• mixture