Review: Chemical Reactions

Front

What is a chemical reaction?

Back

A process in which substances (reactants) are transformed into different substances (products) through the breaking and forming of chemical bonds.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, the total mass of the reactants is equal to the total mass of the products.

Front

What is a synthesis reaction?

Back

A type of chemical reaction where two or more simple substances combine to form a more complex product (A + B → AB).

Front

What is a decomposition reaction?

Back

A type of chemical reaction where a complex molecule breaks down into simpler products (AB → A + B).

Front

What is a single replacement reaction?

Back

A type of chemical reaction where one element replaces another in a compound (A + BC → AC + B).

Front

What is a double replacement reaction?

Back

A type of chemical reaction where the anions and cations of two different compounds exchange places, forming two new compounds (AB + CD → AD + CB).

Front

What is combustion?

Back

A chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light and heat (e.g., C4H12 + O2 → CO2 + H2O).

Front

What is an example of a synthesis reaction?

Back

2H2 + O2 → 2H2O (Hydrogen gas combines with oxygen gas to form water).

Front

What is an example of a decomposition reaction?

Back

2H2O → 2H2 + O2 (Water breaks down into hydrogen and oxygen gases).

Front

What is an example of a single replacement reaction?

Back

Zn + 2HCl → ZnCl2 + H2 (Zinc replaces hydrogen in hydrochloric acid).