Chemistry Final Exam Review

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Example: shredding paper.

Front

What is the oxidation number for Carbon?

Back

The oxidation number for Carbon can be +4 or -4 depending on the chemical context.

Front

What does a Lewis dot diagram represent?

Back

A Lewis dot diagram represents the valence electrons of an atom and how they are arranged in a molecule.

Front

What is the saturated solubility of KNO3 at 40 degrees Celsius?

Back

The saturated solubility of KNO3 at 40 degrees Celsius is 65 grams per 100 mL of water.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its identity, while a chemical change results in the formation of new substances.

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of elements organized by increasing atomic number, which shows the relationships between them.

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is an ion?

Back

An ion is an atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.