Chemistry Semester 1 Ex Review Part 1

Front

What was the result of Rutherford’s investigation in 1911?

Back

The discovery of the structure of the atom.

Front

How many molecules of water are in a collection of snowflakes with a mass of 5.00 mg?

Back

1.67×10^20 molecules.

Front

What is a mixture?

Back

A combination of two or more substances that retain their individual properties.

Front

What term describes materials like salt water, vinegar, bronze, air, and beach sand?

Back

Mixtures.

Front

What is a pure compound?

Back

A substance formed when two or more elements are chemically bonded in a fixed ratio.

Front

Define an element.

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

A substance formed when two or more elements are chemically combined.

Front

What is the law of conservation of mass?

Back

Mass is neither created nor destroyed in a chemical reaction.

Front

What is the difference between a solution and a mixture?

Back

A solution is a homogeneous mixture where one substance is dissolved in another.

Front

What is the atomic theory?

Back

The theory that matter is composed of discrete units called atoms.