Chemical Compounds and Reactions

Front

What is a chemical compound?

Back

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

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements that are chemically combined.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O, which indicates it is made of two hydrogen atoms and one oxygen atom.

Front

What is rust and how is it formed?

Back

Rust is a reddish-brown oxide that forms on iron and its alloys due to a chemical reaction with oxygen and moisture in the environment.

Front

What is surface tension?

Back

Surface tension is the property of a liquid that allows it to resist an external force, due to the cohesive nature of its molecules. It enables some insects to 'walk on water'.

Front

What is a neutron?

Back

A neutron is a subatomic particle found in the nucleus of an atom, with no electric charge. It contributes to the mass of the atom.

Front

What is adhesion in terms of water properties?

Back

Adhesion is the tendency of water molecules to stick to other substances, which helps in processes like capillary action.

Front

What is cohesion in terms of water properties?

Back

Cohesion is the attraction between water molecules, which allows them to form droplets and contributes to surface tension.

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.

Front

What is the role of a catalyst in a chemical reaction?

Back

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.