Question 1 (Multiple Choice Worth 2 points)
[07.06]<object:standard:sc.912.p.8.10>In the chemical reaction shown below, which element was reduced?Zn + H2SO4 ZnSO3+ H2O
[removed] Zn, because it gained 2 electrons [removed] Zn, because it lost 2 electrons [removed] S, because it gained 2 electrons [removed] S, because it lost 2 electrons
Question 2 (Multiple Choice Worth 2 points)
[05.03]<object:standard:sc.912.p.12.10>If 1.6 moles of an ideal gas are at a temperature of 25°C and a pressure of 0.91 atm Hg, what volume would the gas occupy, in liters? [removed] 0.28 L [removed] 3.0 L [removed] 36 L [removed] 43 L
Question 3 (Multiple Choice Worth 2 points)
[05.01]<object:standard:sc.912.p.8.1>Which phase of matter is made up of particles that are packed relatively close together, with an indefinite shape but a definite volume? [removed] gas [removed] liquid [removed] plasma [removed] solid
Question 4 (Multiple Choice Worth 2 points)
[06.04]<object:standard:sc.912.p.10.2>Which of the following circumstances will result in a reaction that is spontaneous only at low temperatures? [removed] positive enthalpy change and positive entropy change [removed] negative enthalpy change and negative entropy change [removed] positive enthalpy change and negative entropy change [removed] negative enthalpy change and positive entropy change
Question 5 (Multiple Choice Worth 2 points)
[08.03]<object:standard:sc.912. l.17.19=””>Which of the following best describes the forces that create natural gas? [removed] Heat from the Earth’s core and pressure transform the remains of dead plants and animals. [removed] Energy of the sun strikes photovoltaic cells producing a flow of electrons. [removed] Heat energy beneath the Earth’s surface heats underground water into steam. [removed] Heat energy is released during nuclear fission and steam is produced to turn a turbine.
Question 6 (Multiple Choice Worth 2 points)
[07.06]<object:standard:sc.912.p.8.8>Which of the following chemical reactions is an oxidation-reduction reaction? [removed] Fe2O3 + 3CO 2Fe + 3CO2 [removed] MgSO4 + 2KI K2SO4 + MgI2 [removed] NaNO3 + KCl KNO3 + NaCl [removed] Cu(NO3)2 + 2HBr CuBr2 + 2HNO3
Question 7 (Multiple Choice Worth 2 points)
[08.01]<object:standard:sc.912.p.10.11, sc.912.p.10.12=””>Which of the following represents a balanced nuclear equation showing Bismuth-212 undergoing alpha decay followed by beta decay? [removed] + x- + [removed] + + x- [removed] + + [removed] + +
Question 8 (Multiple Choice Worth 2 points)
[07.03]<object:standard:sc.912.p.8.11> What is the concentration of hydronium ions in a solution with a pH = 3.9? [removed] 4.14 × 10-2 [removed] 7.80 × 10-3 [removed] 1.26 × 10-4 [removed] 3.00 × 10-5
Question 9 (Multiple Choice Worth 2 points)
[07.02]<object:standard:sc.912.p.8.8, sc.912.p.8.11=””>Which of the following is the salt in the Brønsted-Lowry neutralization reaction?HBr + NaHCO3 H2CO3 + NaBr
[removed] HBr [removed] NaHCO3 [removed] H2CO3 [removed] NaBr
Question 10 (Multiple Choice Worth 2 points)
[05.07]<object:standard:sc.912. p.8.9.=””>How many grams of potassium nitrate (KNO3) would form if 2.25 liters of a 1.50 molar lead nitrate Pb(NO3)2 solution reacts with 1.15 liters of a 2.75 molar potassium chromate K2CrO4solution?Pb(NO3)2 + K2CrO4 PbCrO4 + 2KNO3
[removed] 108 g [removed] 681 g [removed] 639 g [removed] 362 g
Question 11 (Multiple Choice Worth 2 points)
[06.04]<object:standard:sc.912.p.10.6>On a potential energy diagram for the following processes, which of the following has a decrease in entropy? [removed] ice melts [removed] water freezes [removed] water boils [removed] sublimation of dry ice into carbon dioxide gas
Question 12 (Multiple Choice Worth 2 points)
[07.02]<object:standard:sc.912.p.8.8, sc.912.p.8.11=””>If it requires 37.5 mL of a 0. 245 M HBr solution to neutralize 18.0 mL Mg(OH)2, what is the concentration of the Mg(OH) 2 solution?2 HBr + Mg(OH) 2 Mg(Br) 2 + 2 H2O
[removed] 0.0120 M [removed] 0.0255 M [removed] 0.118 M [removed] 0.510 M
Question 13 (Multiple Choice Worth 2 points)
[08.04]<object:standard:sc.912.n.4.2>What is the purpose of environmental remediation? [removed] to restore water to its original purity levels [removed] to make the most of currently used technologies and resources [removed] to remove pollution or contamination from the environment [removed] to reuse materials that would otherwise go to waste
Question 14 (Multiple Choice Worth 2 points)
[06.05]<object:standard:sc.912.n.3.5, sc.912.p.12.12=””>According to the collision theory and model created to explain the collision theory, why does a catalyst cause a reaction to speed up? [removed] It lowers the activation energy. [removed] It increases the collisions per minute. [removed] It increases the average kinetic energy of the particles. [removed] It increases the kinetic energy and the collisions per minute.
Question 15 (Multiple Choice Worth 2 points)
[07.04]<object:standard:sc.912.p.12.13>What is the correct balanced equation for the following equilibrium constant expression? [removed] CO2 (g) CO (g) + ½ O2 (g) [removed] CO2 (g) CO (g) + O2 (g) [removed] 2 CO2 (g) 2 CO (g) + O2 (g) [removed] 2CO (g) + O2 (g) CO2 (g)
Question 16 (Multiple Choice Worth 2 points)
[08.03]<object:standard:sc.912. l.17.19=””>Which of the following natural resources is considered renewable? [removed] biofuel [removed] natural gas [removed] nuclear power [removed] oil
Question 17 (Multiple Choice Worth 2 points)
[06.05]<object:standard:sc.912.n.3.5, sc.912.p.12.12=””>According to the collision theory and model created to explain the collision theory, what two factors must be satisfied for a given collision to be successful and result in the production of products? [removed] Correct molecular shape and momentum. [removed] Correct position and maximum potential. [removed] Correct density and threshold velocity. [removed] Correct orientation and sufficient energy.
Question 18 (Multiple Choice Worth 2 points)
[08.02]<object:standard:sc.912.p.10.11> Which describes nuclear power plants? [removed] They generate power directly from nuclear reactions. [removed] They supply over 50% of the nation’s power needs. [removed] Compared to fossil fuels, they require much less fuel. [removed] They have more atmospheric pollutants compared to fossil fuels.
Question 19 (Multiple Choice Worth 2 points)
[06.02]<object:standard:sc.912.p.10.7>When sulfuric acid is poured on sugar the volume expands, it turns black and gets very hot. Which of the following best describes this reaction? [removed] endothermic [removed] exothermic [removed] decomposition [removed] synthesis
Question 20 (Multiple Choice Worth 2 points)
[05.08]<object:standard:sc.912.p.8.2.>Which of the following solutions will have the greatest colligative effect? [removed] 2 moles of glucose (C6H12O6) dissolved in 1.0 kg of water (H2O) [removed] 1.5 moles of sodium chloride (NaCl) dissolved in 1000.0 kg of water (H2O) [removed] 0.75 moles of calcium fluoride (CaF2) dissolved in 500.0 g of water (H2O) [removed] 0.50 moles of carbon dioxide (CO2) dissolved in 250.0 g of water (H2O)
Question 21 (Multiple Choice Worth 2 points)
[08.06]<object:standard:sc.912. l.16.10=””>Biotechnology has allowed us to genetically modify corn with a gene that acts as a pesticide. What could be a possible environmental impact of this development? [removed] Insects resistant to the specific pesticide would develop over time. [removed] The surplus of corn would rot and decay releasing additional greenhouse gases. [removed] The price of corn would drop dramatically because of a greater supply with no increase in demand. [removed] Countries able to buy the new corn seeds would see increases in their economy and pollution would rise.
Question 22 (Multiple Choice Worth 2 points)
[05.01]<object:standard:sc.912.p.8.1, sc.912.p.8.2=””>Which of the following describes what occurs as a liquid becomes a solid? [removed] A physical change occurs; the particles of the liquid vibrate faster and their kinetic energy increases. [removed] A physical change occurs; the particles of the liquid vibrate more slowly and their kinetic energy decreases. [removed] A chemical change occurs; the particles of the liquid vibrate faster and their kinetic energy increases. [removed] A chemical change occurs; the particles of the liquid vibrate more slowly and their kinetic energy decreases.
Question 23 (Multiple Choice Worth 2 points)
[05.06]<object:standard:sc.912.l.18.12>In a body of water, the surface tension caused by the attraction between water molecules is strong. Which of the following is a consequence of this property? [removed] Water is considered to be a universal solvent. [removed] When water freezes, the molecules move farther apart. [removed] Only a limited amount of solute can be dissolved in a sample of water. [removed] Objects with a higher density than water can be observed floating on water.
Question 24 (Multiple Choice Worth 2 points)
[07.05]<object:standard:sc.912.p.12.13>What would happen to the following endothermic reaction that is in equilibrium if heat is added?N2O4 (g) 2 NO2 (g)
[removed] The reaction would not be affected [removed] The equilibrium would shift to the left [removed] The equilibrium would shift to the right [removed] The product concentration would equal the reactants
Question 25 (Multiple Choice Worth 2 points)
[05.03]<object:standard:sc.912.p.12.10>A sample of gas has a volume of 2.4 L and a pressure of 1.2 atm. What would the pressure of the same gas sample be if the volume is reduced to 1.8 L at a constant temperature? [removed] 0.90 atm [removed] 1.6 atm [removed] 5.2 atm [removed] 3.6 atm
Question 26 (Multiple Choice Worth 2 points)
[07.03]<object:standard:sc.912.p.8.11>Which is not true regarding the pH scale? [removed] The neutral pH at 25°C is 7.0. [removed] Bases have a pH greater than 7.0. [removed] The pH scale measures the hydronium ion concentration in solution. [removed] When the concentration of hydroxide ions increases, the pH decreases.
Question 27 (Multiple Choice Worth 2 points)
[06.04]<object:standard:sc.912.p.10.2>Which of the following reactions results in a decrease in entropy? [removed] CaCO3 (s) CaO (s) + CO2 (g) [removed] N2O4 (g) 2NO2 (g) [removed] CaO (s) + SO3 (g) CaSO4 (s) [removed] 2NH3 (g) N2 (g) + 3H2 (g)
Question 28 (Multiple Choice Worth 2 points)
[07.06]<object:standard:sc.912.p.8.10>What is the oxidation number of sulfur (S) in sulfuric acid (H2SO4)? [removed] -6 [removed] +2 [removed] +4 [removed] +6
Question 29 (Multiple Choice Worth 2 points)
[06.04]<object:standard:sc.912.p.10.6>For an exothermic reaction, which of the following conditions must be true for all products? [removed] The change in enthalpy is positive and potential energy diagram is higher. [removed] The change in enthalpy is negative and potential energy diagram is higher. [removed] The change in enthalpy is positive and potential energy diagram is lower. [removed] The change in enthalpy is negative and potential energy diagram is lower.
Question 30 (Multiple Choice Worth 2 points)
[05.04]<object:standard:sc.912.p.12.10, sc.912.p.8.9=””>When 7.50 L of sulfur trioxide are produced by the reaction of sulfur dioxide in an excess of oxygen at standard temperature and pressure, how many liters of sulfur dioxide were used?2SO2 (g) + O2 (g) 2SO3 (g)
[removed] 3.75 L [removed] 5.00 L [removed] 7.50 L [removed] 15.0 L
Question 31 (Multiple Choice Worth 2 points)
[06.01]<object:standard:sc.912.p.10.2>If you drop a 150 gram piece of metal that has a temperature of 125°Celsius into 1000 grams of water at 20°Celsius, what best describes what would occur? [removed] More heat will be lost by the metal than gained by the water. [removed] The temperature of the water will be greater than the amount of heat lost by the metal. [removed] The temperature change of the metal will equal the temperature change of the water. [removed] The heat lost by the metal will equal the heat gained by the water.
Question 32 (Multiple Choice Worth 2 points)
[06.03]<object:standard:sc.912.p.10.5>Which is not true regarding the specific heat of water? [removed] The specific heat of water explains capillary action. [removed] The specific heat of water is 4.18 J/(°C × g). [removed] Water is useful as an engine coolant because of its high specific heat [removed] The specific heat of water is the reason islands have milder climates.
Question 33 (Multiple Choice Worth 2 points)
[05.05]Which of the following would be the best technique to use in order to separate a liquid from a solution? [removed] chromatography [removed] evaporation [removed] filtration [removed] simple distillation
Question 34 (Multiple Choice Worth 2 points)
[08.01]<object:standard:sc.912.p.10.11, sc.912.p.10.12=””>Which statement is not correct regarding radiation? [removed] Nuclear reactions arise from an atom’s nucleus. [removed] Alpha, Beta, and Gamma are types of radiation. [removed] Most of the earth’s nuclear energy comes from the Sun. [removed] Radioactive elements have an unbalanced number of protons and electrons.
Question 35 (Multiple Choice Worth 2 points)
[08.05]<object:standard:sc.912.p.8.12>Carbon naturally occurs in two forms: diamond and graphite. Why do these two forms have very different properties? [removed] The key difference is that diamonds have other elements bonded within their structure. [removed] The differences are explained by the number of covalent and ionic bonds within each substance. [removed] The differences are explained by the density: graphite is very high and diamond is much lower. [removed] The differences are explained by how the carbon atoms within each substance are covalently bonded together.
Question 36 (Multiple Choice Worth 2 points)
[05.06]When 5.6 grams of NaCl are dissolved in enough water to create a 125-gram solution, what is the solution’s concentration, expressed as a percent by mass? [removed] 3.6% NaCl [removed] 3.8% NaCl [removed] 4.5% NaCl [removed] 4.7% NaCl
Question 37 (Multiple Choice Worth 2 points)
[06.02]<object:standard:sc.912.p.10.6>On an endothermic potential energy diagram, what is true for all products? [removed] The products are at the same energy level as the reactants. [removed] The products are at a lower energy level than the reactants. [removed] The products are at a higher energy level than the reactants. [removed] The products do not have energy.
Question 38 (Multiple Choice Worth 2 points)
[06.03]<object:standard:sc.912.p.10.2, sc.912.p.10.5=””>125.0 g of an unknown substance is heated to 97.0°C. It is then placed in a calorimeter than contains 250g of water with an initial temperature of 20.0°C. The final temperature reached by the calorimeter is 23.5°C. What is the specific heat of the unknown substance? The specific heat of water is 4.18 J/ (°C × g). [removed] 0.285 J/ (°C × g) [removed] 0.398 J/ (°C × g) [removed] 0.729 J/ (°C × g) [removed] 1.24 J/ (°C × g)
Question 39 (Multiple Choice Worth 2 points)
[06.01]<object:standard:sc.912.p.10.2>How would a system which exchanges energy but does not exchange matter between the system and the surroundings be classified? [removed] an open system [removed] an isolated system [removed] a closed system [removed] an integrated system
Question 40 (Multiple Choice Worth 2 points)
[07.05]<object:standard:sc.912.p.12.13>Which of the following is not a result when a change to an equilibrium system is applied? [removed] Increasing the rate of the forward reaction will cause a shift to the left. [removed] Increasing the rate of the reverse reaction will cause a shift to the left. [removed] Decreasing the rate of the forward reaction will cause a shift to the left. [removed] Decreasing the rate of the reverse reaction will cause a shift to the right.
Question 41 (Multiple Choice Worth 2 points)
[08.04]<object:standard:sc.912.l.17.15>Which of the following best summarizes the main causes of water pollution today? [removed] increased runoff, driving, discarded oil [removed] evaporation, new construction, overpopulation [removed] waste from wildlife, decaying vegetation, automobiles [removed] leaking septic and sewer systems, manufacturing, farming
Question 42 (Multiple Choice Worth 2 points)
[08.05]<object:standard:sc.912.p.8.12>A carbon atom has a strong tendency to do which of the following? [removed] double bond with electrons [removed] receive electrons [removed] donate electrons [removed] share electrons
Question 43 (Multiple Choice Worth 2 points)
[07.01]<object:standard:sc.912.p.8.11>What is the difference between a strong acid and a weak acid? [removed] A strong acid has a higher pH than a weak acid. [removed] A strong acid is 100% ionized, a weak acid is less than 100% ionized. [removed] A strong acid is diprotic or triprotic, a weak acid is monoprotic. [removed] A strong acid has a greater concentration of hydroxide ions compared to a weak acid.
Question 44 (Multiple Choice Worth 2 points)
[07.01]<object:standard:sc.912.p.8.11>Which of the following is not true of acids? [removed] Acids are corrosive. [removed] Dilute acids feel slippery. [removed] Acids have a distinctly sour taste. [removed] Acids have more hydronium ions than hydroxide ions
Question 45 (Multiple Choice Worth 2 points)
[07.04]<object:standard:sc.912.p.12.13>Which answer does not describe the following reaction?NO (g) + O2 (g) 2 NO2 (g)
[removed] The reaction is in dynamic equilibrium. [removed] The reaction does not go to completion. [removed] The reaction is reversible. [removed] The concentration of reactants and products will be equal.
Question 46 (Multiple Choice Worth 2 points)
[08.02]<object:standard:sc.912.p.10.11>How can a sample of uranium-235 that has critical mass be induced to react? [removed] It must be spilt with a laser. [removed] It must be fused to a helium nucleus. [removed] It must be bombarded it with neutrons. [removed] It must be shot with light speed electrons.