Tüm alıştırma soruları

A compound has an empirical formula of $CH_2$ and a relative molecular mass of $42$. What is the molecular formula of the compound? $[C = 12, H = 1]$

Match each redox testing reagent or indicator on the left with its characteristic diagnostic observation on the right when reacting with an oxidizing or reducing agent.

Match each chemical mixture recovery requirement on the left with the most appropriate physical separation technique on the right.

When a mechanical stress is applied to a solid metal, the material deforms without shattering. Which of the following structural features of metallic bonding is directly responsible for this malleability?

Ammonium chloride ($NH_4Cl$) is synthesized by reacting ammonia gas with hydrogen chloride gas. Which types of chemical bonding exist within solid ammonium chloride?

A student dilutes $100\text{ cm}^3$ of a $0.05\text{ mol dm}^{-3}$ nitric acid ($\text{HNO}_3$) solution with distilled water to achieve a total volume of $500\text{ cm}^3$ at $25^\circ\text{C}$. What is the pOH of the resulting diluted solution?

During the municipal treatment of water for public consumption, alum, $Al_2(SO_4)_3$, is added to untreated river water. What is the primary chemical function of adding alum in this process?

Match each structural feature of the electron sea model on the left with the macroscopic metal property it directly accounts for on the right.

A solid mixture consists of insoluble silicon(IV) oxide ($\text{SiO}_2$) and soluble potassium tetraoxosulfate(VI) ($\text{K}_2\text{SO}_4$). After adding distilled water to the mixture and stirring thoroughly, which procedure should be used to separate the insoluble solid and obtain pure crystals of potassium tetraoxosulfate(VI)?

Three unlabelled liquid mixtures, $P$, $Q$, and $R$, are tested in a laboratory. Mixture $P$ passes completely through both filter paper and semi-permeable membranes without scattering light. Mixture $Q$ passes through filter paper but is retained by semi-permeable membranes and scatters a narrow beam of light. Mixture $R$ leaves a solid residue on filter paper upon gravity filtration. Which mixture will undergo precipitation upon the addition of an electrolyte, and what physical property accounts for this behavior?

A sealed rigid glass flask contains carbon dioxide gas at a temperature of $7^\circ\text{C}$ and a pressure of $1.4\text{ atm}$. If the flask is heated to a final temperature of $77^\circ\text{C}$ at constant volume, what is the new pressure exerted by the gas?

Under identical conditions of temperature and pressure, a neutral oxide of nitrogen diffuses $1.21$ times faster than carbon(IV) oxide ($CO_2$). Which of the following is a characteristic chemical property of this oxide of nitrogen? ($\text{Relative atomic masses: } C = 12, N = 14, O = 16$)

An industrial gas cylinder is equipped with a pressure safety relief valve calibrated to open when the internal gas pressure reaches $3.60\text{ atm}$. At an ambient temperature of $27^\circ\text{C}$, the enclosed gas exerts a pressure of $2.40\text{ atm}$. Assuming the volume of the container remains strictly constant, what is the maximum temperature in degrees Celsius ($^\circ\text{C}$) to which the cylinder can be heated before the safety valve opens?

At $25^\circ\text{C}$, an aqueous solution of a weak monoacidic base has a concentration of $0.08\text{ mol dm}^{-3}$ and a degree of ionization ($\alpha$) of $0.025$ ($2.5\%$). What is the concentration of hydroxide ions, $[\text{OH}^-]$, in the solution in $\text{mol dm}^{-3}$?

According to Hückel's rule, a planar cyclic conjugated compound exhibits aromatic stability if the number of delocalized $\pi$-electrons in its conjugated ring system is equal to which expression, where $n$ is a non-negative integer?

Calculate the relative molecular mass of hydrated magnesium tetraoxosulfate(VI), $MgSO_4 \cdot 7H_2O$. $[Mg = 24, S = 32, O = 16, H = 1]$

Consider the standard reduction potentials ($E^\circ$) at $25^\circ\text{C}$ for the following half-reactions:

Which of the following chemical species can spontaneously oxidize $\text{I}^-(aq)$ to $\text{I}_2(s)$ under standard conditions, but is UNABLE to oxidize $\text{Br}^-(aq)$ to $\text{Br}_2(l)$?

When excess copper turnings are reacted with dilute trioxonitrate(V) acid ($\text{HNO}_3$), $1.12\text{ dm}^3$ of nitrogen(II) oxide ($\text{NO}$) gas, measured at STP, is evolved. What mass of copper metal was oxidized during this reaction?

$(\text{Molar mass of Cu} = 64\text{ g mol}^{-1},\text{ molar volume of gas at STP} = 22.4\text{ dm}^3\text{ mol}^{-1})$

Match each atmospheric chemical species or pollutant listed on the left with its corresponding atmospheric role or environmental impact listed on the right.