Stoichiometric Relationships

What happens to the speed of particles in a liquid as it is cooled toward its freezing point?

When balancing the equation $P_4 + O_2 \rightarrow P_4O_{10}$, what coefficient is needed for $O_2$?

In a solution of salt water, which component is the solvent?

What is the sum of the coefficients for the following balanced equation?

$C + O_2 \rightarrow CO_2$

A mixture contains iron filings, sodium chloride ($NaCl$), and calcium carbonate ($CaCO_3$). The mixture is separated using the sequence of steps shown in the flowchart below. Based on the physical properties of these substances, which identification of Label X and Label Z is correct?

When solid ammonium chloride is heated, it breaks down into ammonia and hydrogen chloride gases. When these gases cool, they reform solid ammonium chloride. Which term describes this overall physical and chemical observation?

Which statement describes the behavior of particles during the boiling of a liquid?

Which of the following is true regarding the particles of a liquid compared to a gas?

According to Avogadro's hypothesis, what is true about equal volumes of different gases at the same temperature and pressure?

When $AgNO_3(aq)$ and $NaCl(aq)$ are mixed, a white precipitate of $AgCl(s)$ forms. Which statement about the particulate nature of this change is correct?

Which unit is used for relative atomic mass ($A_r$)?

How many moles of phosphorus atoms are in $0.25\text{ mol}$ of $P_4$ molecules?

What is the empirical formula of ethane ($C_2H_6$)?

What is the molar volume of an ideal gas at $273\text{ K}$ and $100\text{ kPa}$?

What volume of $CO_2(g)$ at STP is produced when $1.00\text{ g}$ of glucose ($C_6H_{12}O_6$) is fermented? $C_6H_{12}O_6(s) \rightarrow 2C_2H_5OH(l) + 2CO_2(g)$ ($M_r: C_6H_{12}O_6 = 180.18$; Molar volume at STP $= 22.7\text{ dm}^3\text{ mol}^{-1}$)

What is the concentration, in $\text{mol dm}^{-3}$, of a solution made by dissolving $5.85\text{ g}$ of $NaCl$ in water to make $500\text{ cm}^3$ of solution? ($M = 58.44\text{ g mol}^{-1}$)

Which solution contains the most moles of solute?

Which of the following has the highest atom economy for the production of $X$?

What is the mass of $0.400\text{ moles}$ of $Ca_3(PO_4)_2$ ($M_r = 310.18$)?

How many molecules of water are in a single drop of water ($0.050\text{ cm}^3$, density $= 1.0\text{ g cm}^{-3}$)?

What is the mass of $2.00$ mol of $He$ atoms? (Relative atomic mass: $He = 4.00$)

What is the number of moles in $0.32$ g of $CH_{4}$? (Molar mass of $CH_{4} = 16.04$)

Which of the following describes the percentage yield?

What is the molar mass of $AgNO_{3}$? (Relative atomic masses: $Ag=107.87, N=14.01, O=16.00$)

Which of the following contains the same number of moles of atoms as $16.0$ g of $O_{2}$?

What is the molar mass of a gas if $1.10$ g of the gas occupies $560$ $cm^{3}$ at STP? (Molar volume at STP = $22.7$ $dm^{3}\,mol^{-1}$)

In a titration, $25.0$ $cm^{3}$ of $0.20$ $mol\,dm^{-3}$ $H_{2}C_{2}O_{4}$ (ethanedioic acid) reacts with $20.0$ $cm^{3}$ of $NaOH$. What is the concentration of the $NaOH$ solution?

Consider the following reaction for the analysis of ethanol in wine: $2K_{2}Cr_{2}O_{7} + 3C_{2}H_{5}OH + 8H_{2}SO_{4} \rightarrow 2Cr_{2}(SO_{4})_{3} + 3CH_{3}COOH + 2K_{2}SO_{4} + 11H_{2}O$. If $20.0$ $cm^{3}$ of $0.100$ $mol\,dm^{-3}$ $K_{2}Cr_{2}O_{7}$ reacted with the ethanol in $10.0$ $cm^{3}$ of wine, what is the concentration of ethanol in $mol\,dm^{-3}$?

A solution contains $1.0$ g of $NaOH$ and $1.06$ g of $Na_{2}CO_{3}$. What volume of $0.10$ $mol\,dm^{-3}$ $HCl$ is required to react with both solutes completely?

How many oxygen atoms are there in $1.00$ g of $CaCO_{3}$? ($M = 100.09, L = 6.02 \times 10^{23}$)