Balancing Chemical Equations

Front

What is the little number after an element in a chemical equation called?

Back

Subscript

Front

What type of reaction is represented by the equation 2HI → H2 + I2?

Back

Decomposition

Front

How many HCl molecules do you need to balance the equation Mg + __HCl → MgCl2 + H2?

Back

2

Front

Balance the equation: H2 + Cl2 → ? HCl

Back

H2 + Cl2 → 2HCl

Front

Balance the equation: ___ Mg + ___ O2 → ___ MgO

Back

2, 1, 2

Front

What is a coefficient in a chemical equation?

Back

A coefficient is a number placed in front of a compound to indicate how many molecules are involved in the reaction.

Front

What is the purpose of balancing chemical equations?

Back

To ensure that the number of atoms of each element is the same on both sides of the equation, following the law of conservation of mass.

Front

What does a balanced equation indicate about a chemical reaction?

Back

It indicates that the reactants and products contain the same number of atoms of each element.

Front

What is the difference between a reactant and a product in a chemical equation?

Back

Reactants are substances that undergo a chemical change, while products are the substances formed as a result of the reaction.

Front

What is a synthesis reaction?

Back

A synthesis reaction is a type of chemical reaction where two or more simple substances combine to form a more complex product.