Element and Compound Flashcard

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 can be broken down into simpler substances.

Front

How can you identify an element on the periodic table?

Back

Elements are listed on the periodic table by their chemical symbol, atomic number, and other properties. Each element has a unique atomic number.

Front

What is the chemical formula for salt?

Back

The chemical formula for salt is NaCl, which indicates it is composed of sodium (Na) and chlorine (Cl) atoms.

Front

How many atoms of hydrogen are in water (H2O)?

Back

There are 2 atoms of hydrogen in one molecule of water (H2O).

Front

What is the difference between an element and a compound?

Back

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

Front

Can elements exist in different forms?

Back

Yes, elements can exist in different forms called allotropes, such as carbon which can be found as graphite or diamond.

Front

What is a chemical symbol?

Back

A chemical symbol is a one or two-letter notation used to represent an element on the periodic table, such as H for hydrogen or O for oxygen.

Front

What is the significance of the atomic number?

Back

The atomic number represents the number of protons in the nucleus of an atom and determines the identity of the element.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.