REV U10: Chemical Reactions

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 a limiting reactant?

Back

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product that can be formed.

Front

How do you determine the number of moles in a substance?

Back

The number of moles can be determined using the formula: moles = mass (g) / molar mass (g/mol).

Front

What is the balanced equation for the synthesis of iron (III) oxide?

Back

The balanced equation is: @@4Fe + 3O_2 ightarrow 2Fe_2O_3@@.

Front

What does the (s) symbol indicate in a chemical equation?

Back

The (s) symbol indicates that the substance is a solid.

Front

What is the molar mass of potassium bromide (KBr)?

Back

The molar mass of KBr is approximately 119 g/mol.

Front

How do you calculate the mass of a product formed in a reaction?

Back

To calculate the mass of a product, use stoichiometry based on the balanced equation and the moles of the limiting reactant.

Front

What is the significance of balancing chemical equations?

Back

Balancing chemical equations ensures that the law of conservation of mass is obeyed, meaning the number of atoms of each element is the same on both sides.

Front

What is a precipitation reaction?

Back

A precipitation reaction occurs when two aqueous solutions react to form an insoluble solid, known as a precipitate.

Front

How many moles of Cl2 are required to produce 4 moles of NaCl?

Back

2 moles of Cl2 are required, as shown in the equation: @@2Na + Cl_2 ightarrow 2NaCl@@.