Elements, Compounds, Mixtures

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 and is made up of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Tags

NGSS.MS-PS1-1

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

How can you classify brass?

Back

Brass is classified as a mixture because it is made of two elements, zinc and copper, that are combined physically.

Front

What is the chemical symbol for hydrogen?

Back

The chemical symbol for hydrogen is H.

Front

What does the formula NH₃ represent?

Back

The formula NH₃ represents ammonia, which is a compound made of nitrogen and hydrogen.

Tags

NGSS.MS-PS1-1

Front

How many types of atoms are present in K₂SO₄?

Back

There are three types of atoms in K₂SO₄: potassium (K), sulfur (S), and oxygen (O).

Tags

NGSS.MS-PS1-1

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition with distinct phases.

Front

What is an example of a compound?

Back

Water (H₂O) is an example of a compound, as it is formed from the chemical bonding of hydrogen and oxygen.

Tags

NGSS.MS-PS1-1

Front

What is the law of definite proportions?

Back

The law of definite proportions states that a chemical compound always contains its component elements in fixed ratio by mass.