Elements and Compounds Identification

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists 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. It has unique properties different from the individual elements.

Front

How can you identify an element from a chemical formula?

Back

An element is represented by a single chemical symbol (e.g., H for hydrogen), while a compound has two or more symbols (e.g., H2O for water).

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule. For example, in H2O, the '2' indicates there are two hydrogen atoms.

Front

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

Back

A chemical change results in the formation of new substances with different properties, while a physical change does not alter the chemical composition of a substance.

Front

What is the chemical formula for sodium hydroxide?

Back

The chemical formula for sodium hydroxide is NaOH.

Front

How many different elements are in the compound CaHO2CH?

Back

There are 4 different elements in the compound CaHO2CH: Calcium (Ca), Hydrogen (H), Oxygen (O), and Carbon (C).

Front

What is the significance of the periodic table in identifying elements?

Back

The periodic table organizes all known elements based on their atomic number, electron configuration, and recurring chemical properties.

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

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, involving the breaking and forming of bonds.