Pure Substances: Elements and Compounds

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.

Front

What is an element?

Back

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

Front

What is a compound?

Back

A compound is a pure substance formed when two or more elements chemically combine in fixed proportions. It can be separated into its components only by chemical reactions.

Front

What is the chemical symbol for Magnesium?

Back

Mg

Front

Which of the following can be separated chemically?

Back

Compounds only.

Front

What does a chemical formula represent?

Back

A chemical formula represents a compound, showing the elements present and the number of atoms of each element.

Front

What is the difference between an element and a compound?

Back

An element is a single type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Front

What is the periodic table?

Back

The periodic table is a tabular arrangement of all known elements, organized by increasing atomic number and grouped by similar properties.

Front

Which of the following is NOT an element? Carbon (C), Silver (Ag), Salt (NaCl), Lithium (Li)

Back

Salt (NaCl) is a compound, not an element.

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.