Prepare for your Chemistry final exam with these practice questions and answers. This comprehensive guide covers atomic structure, chemical bonding, reactions, stoichiometry, acids and bases, and solutions.
Q: What is the molarity of a 200mL solution in which 0.2 mole of sodium bromide is dissolved ?
Answer: 1.0M
Q: What is the percent by mass of a water solution that contains 60 g of calcium chloride, CaCl2, and that has a mass of 400g ?
Answer: 15%
Q: What is the percent by mass of a solution containing 25 g of NaCl in 175 g of solution ?
Answer: 14%
Q: You need to prepare 500.0 mL of 0.750M NaBr solution using a stock solution with a concentration of 2.50M NaBr. Which expression should you use to calculate how much stock solution you need ?
Answer: 0.75M * 500.0mL / 2.5M
Q: What type of reaction is indicated by this general equation ?AB -> A + B
Answer: Decomposition Reaction
Q: In a solution, what is the solvent ?
Answer: The medium in which particles are dissolved
Q: If ammonia reacts according to the following equation, how many kilograms of NO could be actually produced from 10.0kg of NH3 if the percent yield of NO is 80.0%
Answer: 14.1 kg NO
Q: The molarity of a solution that contains 14g KOH per 150 mL of solution is :
Answer: 1.7M
Q: What volume of 1.25M HCL would be required to prepare 180mL of a 0.500M HCL solution ?
Answer: 72mL
Q: What is the percent by mass of a solution containing 25 g of NaCl in 175 g of solution ?
Answer: 14%
Q: What is the molality of a solution prepared by dissolving 13.0g of Ba(NO3)2 in 450 g of water ?
Answer: 0.11 molal
Q: Given the reaction CaCo3-> CaO+ CO2 , if 50.0g of CaCO3, react to actually produce 20.0g of CO2. What is the percent yield of CO2 ?
Answer: 40.0%
Q: Given the equation 2H2O -> 2H2+ O2
Answer: Decomposition
Q: To 225mL of a 0.80M solution of KI, a student adds enough water to make 1 L of a more dilute KI solution. What is the molarity of the new solution ?
Answer: 0.18M
Q: What type of reaction is shown ? 2Na +2H2o-> 2NaOH +H2
Answer: Single Replacement
Q: A scientists adds 10mg of sodium chloride (NaCl) to 100 mL of water and stirs until the sodium chloride dissolves. What is the solute in this process ?
Answer: Sodium Chloride
Q: A sugar cube is dropped into a glass of water. The water is stirred until the sugar cube is no longer visible. Which of these statements is correct ?
Answer: A solution has formed and sugar is the solute
Q: Identify the single-replacement reaction.
Answer: 2Al + 3Fe(NO3)2 -> 2Al(NO3)3 +3Fe
Q: Which formula shows how to calculate the percent yield of a reaction ?
Answer: actual / theoretical x 100%
Q: A reaction that has been calculated to produce 60.0 g of CuCl2 actually produces 50.0 g of CuCl2. What is the percent yield ?
Answer: 83.3%
Q: What is the molarity of a solution that contains 8 moles of solute in 2 L of a solution ?
Answer: 4M
Q: What is the molar mass of Fe(OH)3
Answer: 107 grams/mol
Q: The symbol (s) after a chemical compound lets you know that it is :
Answer: a solid
Q: When water and carbon dioxide are formed during an exothermic reaction, it’s probably a :
Answer: combustion reaction
Q: If the theoretical yield for a reaction was 156 grams and I actually made 122 grams of the product,what is my percent yield ?
Answer: 78.2 %
Q: If I have 30 grams of lithium hydroxide, LiOH, dissolved to make 3L of solution, the molarity of this solution is :
Answer: 10.0M
Q: * If I dilute 5 mL of 0.15 M NaCl to final volume of 5 L, what’s the final concentration of NaCl ?
Answer: 0.00015M
Q: What is the percent yield of CO2 if the reaction of 10 grams of CO with O2 actually produced 12.8 grams of CO2 ? 2CO + O2 -> 2CO2
Answer: 81.5%
Q: Which of the following reaction is a combination (synthesis) reaction ?
Answer: Na2O +CO2 -> Na2CO3
Q: Which response includes all of the following that are single replacement reactions, and no other reactions ?
Answer: II only( Cl2 +2NaBr -> Br2 +2NaCl)
Q: A student dilutes 50.0 mL of a 0.10 mol/L solution of HCL to 0.010 mol/L by adding water. Which statement is true?
Answer: The total amount of solute decreases.
Q: A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The concentration of CaCl2 is _____% by mass.
Answer: 5.94 %
Q: Th amount of substance that is isolated in the laboratory is called ______ ?
Answer: actual yield
Q: It measures the efficiency of the reaction
Answer: percent yield
Q: The limiting reagent in a chemical reaction is the ____ that is ____.
Answer: reactant, used up
Q: In a particular reaction between copper metal and silver nitrate, 12.7 g Cu produced 38.1 g Ag. What is the percent yield of silver in this reaction ? Cu + AgNO3 –> Cu(NO3)2+Ag
Answer: 88.2%
Q: In a chemical reaction, the mass of products
Answer: is equal to the mass of the reactants
Q: Given the reaction Zn +HCl-> ZnCl2 +H2, if 2.0 mol Zn and 5.0 mol HCl are allowed to react
Answer: Zn is the limiting reactant
Q: Which of the following would be the limiting reagent in the reaction shown below ?
Answer: neither a nor b is limiting
Q: What is the maximum number of grams of PH3 that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH3 ?
Answer: 6.8g
Q: How would you prepare 500.0 mL of 2.00 mol/L solution of HCL from a solution of 12.0 mol/L ?
Answer: To some water in a 500.0 mL volumetric flask, add 83.3 mL of concentrated acid, then dilute to the mark.
Q: A student adds 6.00g of a solid to 30.0 mL of water. What is the concentration of this solution expressed as percent by mass ?
Answer: 16.7%
Q: A student dilutes 50.0 mL of a 0.10 mol/L solution of HCL to 0.010 mol/L by adding water. Which statement is true?
Answer: The total amount of solute decreases.
Q: What is the molarity of a solution that contains 32.0 g of HCL in 2.50 L of solution ?
Answer: 0.351M
Q: What is the molarity of a NaNO3 solution if 25.0 mL of a 0.200M solution is diluted to 100.0ml?
Answer: 0.0500 M
Q: In a solution, the solvent is
Answer: the substance percent in the greatest amount
Q: A solution is made by dissolving 0.40 mole of NaCl in enough water to give a final volume of 250.0 mL. What is the molarity of the solution ?
Answer: 1.6M
Q: What is the molarity of a solution containing 17.0 grams of NH3 in 1.20 liters of solution ?
Answer: 14.2 M
Q: What volume, in milliliters, of 6.0 M NaOH is needed to prepare 175 mL of 0.20 M NaOH by dilution ?
Answer: 5.8mL
Q: Which of the following solutions would always contain 10.0 g of solute per 40.0 g of solvent ?
Answer: 25.0% by mass
Q: Which of the following solutions has a molarity of 1.0?
Answer: no correct response
Q: Which of the following solutions will have a molarity of less than 1.0 after 50.0 mL of solvent is added to it ?
Answer: 10.0 mL of 5.0 M solution
Q: How many mL of alcohol are in 240 mL of 95% by volume alcohol solution.
Answer: 228mL
Q: If more solvent is added to a solution
Answer: the molarity decreases
Q: Identify respectively, the limiting reagent and calculate the number of grams leftover of the reagent in excess for the following equation. Cr2O3 + 3CCL4–> 2CrCl3 + 3COCl2
Answer: limiting: Cr2O3, 10g of CCl4 left over
Q: Identify the limiting reagent and the number of grams left over in excess, respectively, for the following reaction if 1.9 g of each reactant are used.COCl2 + 2NaOH -> 2NaCl +H2O +CO2
Answer: limiting:COCl2, 0.4 g NaOH left over
Q: Which of the following units is the equivalent unit for molarity ?
Answer: mole/L
Q: Which of the following units is the common way of expressing concentration of alcohol in alcoholic beverages ?
Answer: percent by volume
Q: An equation is balanced by
Answer: adding coefficients
Q: An equation is balanced by
Answer: adding coefficients
Q: Which type of bond is formed when an atom of sodium transfers an electron to an iodine atom?
Answer: ionic
Q: Which of the following statements contrasting covalent bonds and ionic bonds is correct ?
Answer: Covalent bonds usually involve two nonmetals and ionic bonds usually involve a metal and a nonmetal
Q: Which pairs of atoms will share electrons when a bond is formed between them
Answer: C and O
Q: Sixteen electrons and present in the Lewis structure of which of the following molecules?
Answer: more than one correct response
Q: An element that would have the Lewis dot structure that contain two dots is
Answer: Xe
Q: Which of the following pairs of elements would have the same Lewis Dot configuration
Answer: oxygen and selenium
Q: What is represented in a Lewis dot structure ?
Answer: the element’s symbol and number of valence electrons
Q: Which of the following could possibly form a covalent bond with chlorine ?
Answer: sodium
Q: In which of the following molecular compounds are all the bonds single bonds?
Answer: CO
Q: What type of bond exist when electrons are shared ?
Answer: covalent