Balancing Equations RE- TEST

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, following the law of conservation of mass.

Front

What does the coefficient in a chemical equation represent?

Back

The coefficient indicates the number of molecules or moles of a substance involved in the reaction.

Front

How do you determine the number of atoms in a compound?

Back

Count the number of atoms of each element in the chemical formula. For example, in MgCl2, there are 1 magnesium atom and 2 chlorine atoms.

Front

What is the law of conservation of mass?

Back

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

Front

How do you balance the equation CaCl2 + Na3PO4 → Ca3(PO4)2 + NaCl?

Back

The balanced equation is 3 CaCl2 + 2 Na3PO4 → 1 Ca3(PO4)2 + 6 NaCl.

Front

What is the balanced equation for Al + FeO → Al2O3 + Fe?

Back

The balanced equation is 4 Al + 3 FeO → 2 Al2O3 + 3 Fe.

Front

How do you balance the equation AgI + Na2S → Ag2S + NaI?

Back

The balanced equation is 2 AgI + 1 Na2S → 1 Ag2S + 2 NaI.

Front

How many atoms of Magnesium are in 10MgCl2?

Back

There are 10 Magnesium atoms in 10MgCl2.

Front

What is the balanced equation for (NH4)3PO4 + Pb(NO3)4 → Pb3(PO4)4 + NH4NO3?

Back

The balanced equation is 4 (NH4)3PO4 + 3 Pb(NO3)4 → 1 Pb3(PO4)4 + 12 NH4NO3.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.