Question

In the carbon cycle, combustion reactions produce atmospheric oxygen.

True

False

The empirical formulas for H₂O, H₂O₂, NH₃, N₂H₄, C₁₂H₂₂O₁₁, and Al₂Cl₆ are H₂O, HO, NH₃, NH₂, C₁₂H₂₂O₁₁, and AlCl₃, respectively.

True

False

The combustion reaction of hydrocarbons, in the presence of excess oxygen, will produce carbon monoxide and water.

True

False

Stoichiometry of a chemical reaction refers to the quantitative relationships between the amounts of reactants and products involved in the reaction.

True

False

The percent composition of a substance is the number of moles of each element in the compound divided by the number of moles of the compound.

True

False

The actual yield (experimentally determined) of a chemical reaction is almost always larger than the theoretical yield because of side reactions, incomplete reactions, and loss during purification steps. The percent yields for most reactions are less than 100%.

True

False

Answer 1

In the carbon cycle, combustion reactions produce atmospheric oxygen.

In photosynthesis to produced oxygen

True >>>>answer

The empirical formulas for H₂O, H₂O₂, NH₃, N₂H₄, C₁₂H₂₂O₁₁, and Al₂Cl₆ are H₂O, HO, NH₃, NH₂, C₁₂H₂₂O₁₁, and AlCl₃, respectively.

True >>>>answer

The combustion of hydrocarbons in presence of excess of oxygen to produce CO2 , H2O

The combustion reaction of hydrocarbons, in the presence of excess oxygen, will produce carbon monoxide and water.

False >>>answer

Stoichiometry state the mass -mass, volume-volume, mass-volume relation ship between reactant and products.

Stoichiometry of a chemical reaction refers to the quantitative relationships between the amounts of reactants and products involved in the reaction.

True >>>>answer

The percent composition of a substance is the number of moles of each element in the compound divided by the number of moles of the compound.

True >>>>answer

percent yield   = actual yield*100/theoretical yield

actual yield always less than the theoretical yield .

False >>>answer