Chemical Reactions and the Mole

Practice fill-in-the-blank flashcards covering chemical reaction classifications, writing balanced formula equations, the mole concept, molar mass, and stoichiometric mole-to-mole conversions.

In a combustion reaction, __________ is always a reactant.

$$O_2$$

A synthesis reaction is also referred to as an addition or __________ reaction.

combination

In a single replacement reaction, one of the reactants is always an __________.

element

In a double replacement precipitation reaction, two ionic compounds react to form a product that is a __________.

solid

In a double replacement neutralization reaction, an acid reacts with a base to produce a salt and __________.

$$H_2O$$

When solid diboron hexahydride reacts with oxygen gas in a combustion reaction, the products are solid diboron trioxide and __________.

liquid water

The balanced chemical equation for the single replacement reaction between silver sulfide solid and aluminum metal is $3Ag_2S_{(s)} + 2Al_{(s)} \rightarrow 6Ag_{(s)} + \_\_\_\_\_\_\_\_\_\_$.

$$Al_2S_{3(s)}$$

The reaction between magnesium hydroxide and hydrochloric acid is represented by $Mg(OH)_2 + 2HCl \rightarrow MgCl_2 + \_\_\_\_\_\_\_\_\_\_$.

$$2H_2O_{(l)}$$

In chemistry, the counting unit mole ($\text{mol}$) is often described as the "chemist's __________."

dozen

One mole of any substance contains exactly __________ atoms or molecules.

$$6.02 \times 10^{23}$$

One mole is defined as the number of particles equal to the number of atoms in exactly __________ of $^{12}C$.

$$12\,g$$

The mass of $1\text{ mole}$ of a substance is called its __________.

molar mass

Calculated by adding atomic masses from the periodic table rounded to two decimal places, the molar mass of $Fe(OH)_3$ is __________.

$$106.88\,g/mol$$

$0.536\text{ mols}$ of aluminum has the __________ number of atoms as $0.536\text{ mols}$ of iron.

same

$27.0\,g$ of aluminum does not have the same number of atoms as $27.0\,g$ of iron because $27.0\,g$ of iron represents only a __________ of a mole.

portion

Converting $14.8\,g$ of $NaOH$ (molar mass $40.0\,g/mol$) into moles yields __________ ($3\text{ sf}$).

$$0.370\,mol\,NaOH$$

An average cup of coffee containing $125\,mg$ of caffeine ($C_8H_{10}N_4O_2$, molar mass $194.2\,g/mol$) contains __________ moles of caffeine.

$$6.44 \times 10^{-4}\,mol$$

In a balanced chemical reaction, the __________ represent the mole ratio of particles.

coefficients

According to the reaction $FeCl_3 + 3NaOH \rightarrow Fe(OH)_{3(s)} + 3NaCl$, reacting $5.7\,mol$ of $NaOH$ requires __________ of $FeCl_3$.

$$1.9\,mol$$

In the reaction $4Fe_{(s)} + 3O_{2(g)} \rightarrow 2Fe_2O_{3(s)}$, the complete oxidation of $6.2\,mol$ of $Fe$ forms __________ of $Fe_2O_3$.

$$3.1\,mol$$