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📚 Quick Study Guide

• ⚛️ Atomic Structure: Remember that atoms consist of protons, neutrons, and electrons. The number of protons defines the element.
• 🧪 Chemical Reactions: A chemical reaction involves the rearrangement of atoms and molecules. Know your reaction types: synthesis, decomposition, single displacement, and double displacement.
• ⚖️ Balancing Equations: Always ensure mass is conserved. Balance chemical equations by adjusting coefficients to have the same number of each type of atom on both sides.
• 🌡️ Thermochemistry: Enthalpy ($\Delta H$) is the heat absorbed or released in a reaction. Exothermic reactions have negative $\Delta H$ values, and endothermic reactions have positive values.
• 🧮 Stoichiometry: Use mole ratios from balanced equations to calculate amounts of reactants and products.
• 💡 Solutions: Molarity (M) is moles of solute per liter of solution. Understand dilution: $M_1V_1 = M_2V_2$.
• 📈 Gas Laws: Know your gas laws: Boyle's Law ($P_1V_1 = P_2V_2$), Charles's Law ($\frac{V_1}{T_1} = \frac{V_2}{T_2}$), and the Ideal Gas Law ($PV = nRT$).

Practice Quiz

1. What is the coefficient for $O_2$ when the following equation is properly balanced using the smallest whole numbers? $C_3H_8(g) + O_2(g) \rightarrow CO_2(g) + H_2O(g)$
   1. 2
   2. 4
   3. 5
   4. 7
2. Which of the following is an example of a decomposition reaction?
   1. $2H_2(g) + O_2(g) \rightarrow 2H_2O(l)$
   2. $Zn(s) + 2HCl(aq) \rightarrow ZnCl_2(aq) + H_2(g)$
   3. $CaCO_3(s) \rightarrow CaO(s) + CO_2(g)$
   4. $NaOH(aq) + HCl(aq) \rightarrow NaCl(aq) + H_2O(l)$
3. What volume of 2.0 M $HCl$ is required to neutralize 25.0 mL of 1.0 M $NaOH$?
   1. 10.0 mL
   2. 12.5 mL
   3. 25.0 mL
   4. 50.0 mL
4. According to Boyle's Law, what happens to the volume of a gas if the pressure is doubled, assuming the temperature remains constant?
   1. Volume doubles
   2. Volume halves
   3. Volume remains constant
   4. Volume quadruples
5. For an endothermic reaction, which of the following is true?
   1. $\Delta H < 0$
   2. $\Delta H > 0$
   3. $\Delta H = 0$
   4. $\Delta H$ is not related to endothermic reactions
6. What is the molar mass of $H_2SO_4$?
   1. 49 g/mol
   2. 65 g/mol
   3. 98 g/mol
   4. 120 g/mol
7. Which of the following is the correct equilibrium constant expression ($K_c$) for the reaction: $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$?
   1. $K_c = \frac{[N_2][H_2]}{[NH_3]}$
   2. $K_c = \frac{[NH_3]}{[N_2][H_2]}$
   3. $K_c = \frac{[NH_3]^2}{[N_2][H_2]^3}$
   4. $K_c = \frac{[N_2][H_2]^3}{[NH_3]^2}$