Chemistry Study Guide and Practice Problems - Google Gemini

What is Avogadro's constant, which represents the number of particles in one mole of a substance?

$$6.02 \times 10^{23}\,mol^{-1}$$

What is the chemical reaction equation when solid magnesium reacts with aqueous hydrochloric acid?

$$Mg_{(s)} + 2HCl_{(aq)} \rightarrow MgCl_{2(aq)} + H_{2(g)}$$

What is the equilibrium reaction equation for the Haber process synthesis of ammonia?

$$N_{2(g)} + 3H_{2(g)} \rightleftharpoons 2NH_{3(g)}$$

What is the chemical formula for sulfuric acid?

$$H_2SO_4$$

What is the chemical formula for carbon dioxide?

$$CO_2$$

What is the chemical formula for magnesium chloride?

$$MgCl_2$$

What standard unit is used for chemical concentration?

$$mol\,dm^{-3}$$

What standard unit is used for molar mass?

$$g\,mol^{-1}$$

What standard unit is used for molar enthalpy change?

$$kJ\,mol^{-1}$$

Convert a volume of $500\,cm^3$ into cubic decimeters ($dm^3$).

$$0.5\,dm^3$$

What is the formula to calculate moles ($n$) from mass ($m$) and molar mass ($M$)?

$$n = \frac{m}{M}$$

What is the formula to calculate concentration ($c$) from moles ($n$) and volume ($V$) in $dm^3$?

$$c = \frac{n}{V}$$

What is the equation for $pH$ in terms of hydrogen ion concentration $[H^+]$?

$$pH = -\log_{10}([H^+])$$

What state symbol denotes an aqueous solution?

$$(aq)$$

What state symbol denotes a solid substance?

$$(s)$$

What state symbol denotes a liquid substance?

$$(l)$$

What state symbol denotes a gaseous substance?

$$(g)$$

What is the ideal gas equation relating pressure ($P$), volume ($V$), moles ($n$), gas constant ($R$), and temperature ($T$)?

$$P V = n R T$$

How many moles of $CO_2$ are present in an $88\,g$ sample with molar mass $44\,g\,mol^{-1}$?

$$2\,mol$$

What chemical symbol represents dynamic equilibrium in a reversible reaction?

$$\rightleftharpoons$$

What chemical symbol represents a reaction proceeding forward to completion?

$$\rightarrow$$

How many cubic centimeters ($cm^3$) are in $1\,dm^3$?

$$1000\,cm^3$$

What unit is used to express reaction rate in concentration change per second?

$$mol\,dm^{-3}\,s^{-1}$$

What is the balanced equation for the complete combustion of methane gas ($CH_4$) in oxygen ($O_2$)?

$$CH_{4(g)} + 2O_{2(g)} \rightarrow CO_{2(g)} + 2H_2O_{(l)}$$

What is the general expression for the equilibrium constant $K_c$ for reaction $aA + bB \rightleftharpoons cC + dD$?

$$K_c = \frac{[C]^c [D]^d}{[A]^a [B]^b}$$