Pure Substances: Elements and Compounds

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 one or two letters, with the first letter always capitalized.

Front

What is a compound?

Back

A compound is a pure substance formed when two or more elements are chemically bonded together. Compounds have unique properties different from the elements that make them up.

Front

What is the chemical symbol for Magnesium?

Back

The chemical symbol for Magnesium is Mg.

Front

Which of the following is NOT a compound: NaCl, HMg, Si, PbSO?

Back

Si is NOT a compound; it is an element.

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 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 a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Each substance retains its own properties.

Front

What is the chemical formula for table salt?

Back

The chemical formula for table salt is NaCl, which is a compound made of sodium and chlorine.

Front

What does the term 'atom' refer to?

Back

An atom is the smallest unit of an element that retains the properties of that element.

Front

What is the significance of a chemical symbol?

Back

A chemical symbol is a one or two-letter notation used to represent an element on the periodic table.