Balancing Equations RE- TEST

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during the reaction.

Front

What does it mean if a chemical equation is not balanced?

Back

If a chemical equation is not balanced, it means that the number of atoms of at least one element is different on the reactant side compared to the product side, violating the law of conservation of mass.

Front

How do you balance the equation PCl5 + 2H2O → H3PO4 + HCl?

Back

This equation is not balanced because there are 5 Cl atoms on the left and only 1 on the right. To balance it, adjust coefficients to ensure equal numbers of each atom.

Front

What are the coefficients for the reaction Mg(NO3)2 + K3PO4 → Mg3(PO4)2 + KNO3?

Back

The coefficients are 3, 2, 1, 6 respectively, indicating 3 Mg(NO3)2, 2 K3PO4, 1 Mg3(PO4)2, and 6 KNO3.

Front

What are the coefficients for the reaction 2AgI + Na2S → Ag2S + 2NaI?

Back

The coefficients are 2, 1, 1, 2 respectively, indicating 2 AgI, 1 Na2S, 1 Ag2S, and 2 NaI.

Front

How do you balance the equation Al + HCl → H2 + AlCl3?

Back

The balanced coefficients are 2, 6, 3, 2, meaning 2 Al, 6 HCl, 3 H2, and 2 AlCl3.

Front

What are the coefficients for the reaction Zn + HCl → ZnCl2 + H2?

Back

The coefficients are 1, 2, 1, 1 respectively, indicating 1 Zn, 2 HCl, 1 ZnCl2, and 1 H2.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is a reactant in a chemical equation?

Back

A reactant is a substance that undergoes a chemical change in a reaction, found on the left side of a chemical equation.

Front

What is a product in a chemical equation?

Back

A product is a substance that is formed as a result of a chemical reaction, found on the right side of a chemical equation.