Extension: 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 consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together. For example, water (H2O) is a compound made of hydrogen and oxygen.

Front

How many elements are in the compound C2H8O?

Back

There are 3 elements: Carbon (C), Hydrogen (H), and Oxygen (O).

Front

What does the subscript in a chemical formula indicate?

Back

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

Front

How many Aluminum atoms are in Al2O3?

Back

There are 2 Aluminum atoms in Al2O3.

Front

How many Chlorine atoms are in MgCl2?

Back

There are 2 Chlorine atoms in MgCl2.

Front

What is the chemical formula for glucose?

Back

The chemical formula for glucose is C6H12O6.

Front

How many different elements are present in H2SO4?

Back

There are 3 different elements: Hydrogen (H), Sulfur (S), and Oxygen (O).

Front

What is the difference between an element and a compound?

Back

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

Front

What is the significance of chemical formulas?

Back

Chemical formulas provide information about the types and numbers of atoms in a compound, allowing us to understand its composition.