A chemical reaction consists of

During a chemical reaction,

An example of chemical change is

An example of physical change is

The combustion of butane gas is

If the mass of reactants = 30 g, then the mass of products is equal to

Magnesium reacts with oxygen gas in air to produce magnesium oxide. The word equatin of the reaction is written as

The combustion of butane gas produces carbon dioxide and water vapor. The products of the reaction are:

Acid reacts with base to produce salt and water. The word equation of the reaction is written as:

During a chemical change,

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