HESI A2: Chemistry (Quiz 2) Welcome to your HESI A2 Practice Quizzes. Note: We designed FIVE (5) sets of practice quizzes for this Domain. Each set has 30 questions. Domain 4 (quiz 2): Chemistry. (30 questions) Please click NEXT to start your Free HESI Practice Quizzes right away. Best of Luck! 1. An oxidizing agent does which of the following? Loses electrons Reduces another chemical Oxidizes another chemical Is oxidized by the reducing agent None 2. The mass of a grain of sand is 1.672 × 10^-4 kg. Express this number in standard notation. 0.0001672 kg 0.00001672 kg 1,672 kg 1,672,000 kg None 3. Which is the reducing agent in the following reaction? HNO3 + HI→ NO + I2 + H2O I O N H None 4. On which of the following temperature scales can a negative number not exist? Joule Fahrenheit Kelvin Celsius None 5. Which of the following is not likely to have a dipole? Nonpolar compound Salt Polar compound Ionic compound None 6. What does the mass number of an atom represent? Protons, electrons, and neutrons Protons and neutrons Protons and electrons Protons None 7. Answer: 0.08 M Molarity is defined as moles of solute divided by liters of solution and has units of mol/L. To get this answer, you just divide the number of moles by the volume in liters: 0.40 mol/5 L = 0.08 M 2s 2p 1s 3s None 8. When a chemist dips a piece of blue litmus paper into a solution, no color change is observed. Why? The solution is acidic The solution is basic pH is less than 7 The pH paper is too old None 9. How many electrons does a neutral atom of nitrogen have? 5 7 8 6 None 10. If a solution is neutral, where would its pH lie? Below 7.0 Above 7.0 7.0 None 11. Which of the following represents the correct electron configuration for sodium (Na)? 1s2 2s2 2p6 2s1 2s2 2s2 2p6 3s1 1s2 2s2 2p6 3s1 None 12. Cesium-137 has a half-life of 30 years. If a 2.0 g sample of cesium-137 decays over 120 years, how much would remain? 1.4 g 0.5 g 0.125 g 0.25 g None 13. The half-life of As-81 is 33 seconds. If only 12.5 g of a 100.0 g sample of As-81 is left, how long did it take for the original sample to decay to its current mass? 16.5 s 33 s 66 s 99 s None 14. Which of the following is located in Group 2 of the periodic table? Hydrogen Neon Barium Lithium None 15. If a fat has more than one double bond, what is it called? Polyunsaturated Trans fat Monounsaturated Saturated None 16. How many neutrons does 58Cr have? 35 34 36 58 None 17. How many total amino acids are needed for the human body to produce all the proteins it needs? 11 10 9 20 None 18. Which of the following elements is located in period 2 of the periodic table? Oxygen Hydrogen Helium Magnesium None 19. Which element is located in both Group 2 and Period 4? Potassium Magnesium Calcium Barium None 20. What is 6,987,000 in scientific notation? 6.987 x 10^5 6.987 x 10^6 0.6987 x 10^7 69.87 x 10^5 None 21. Which of the following comprise an ionic compound? Electron and quark Cation and anion Anion and neutron Cation and proton None 22. How many protons does the element xenon (Xe) have? 54 18 55 53 None 23. What are the three main components of a number that is expressed in scientific notation? Significant digit, mathematical sign, and exponential Mathematical sign, root, and exponential Mathematical sign, significand, and exponential Exponential, logarithm, and mathematical sign None 24. Why does increasing the surface area of reactants or catalysts increase the rate of a reaction? It reduces the amount of precipitate that is formed during the reaction. It introduces charges on the surface of the particles, which makes them more reactive. It increases the likelihood of molecules encountering one another. The activation energy of the reaction is lowered. None 25. What is the percent concentration of benzene in a solution containing 59 mL of benzene and 150 mL toluene? 56.4 % 14.1 % 28.2 % 39.3 % None 26. Which of the following best describes what occurs when an equilibrium is established in a reaction?’ The rate of the forward reaction is equal to the rate of the reverse reaction. The catalyst is fully consumed, terminating the reaction. All reagents have been consumed. All products have precipitated from the solution. None 27. What is the name given to a negatively-charged atom? Anion Cation Isotope Ion None 28. Which type of reaction below represents an acid-base reaction? 2 NaBr + Ca(OH)2 → CaBr2 + 2 NaOH 3 HBr + Al(OH)3 → 3 H2O + AlBr3 2 NH3 + H2SO4 → (NH4)2SO4 MgCl2 + Li2CO3 → MgCO3 + 2 LiCl None 29. Which of the following is a positively-charged atom? Anion Protons Ion Cation None 30. How many moles of LiOH are in 500 mL of a 1.50 M LiOH solution? 3.0 moles LiOH 0.75 moles LiOH 2.25 moles LiOH 0.375 moles LiOH None 1 out of 30 Time is Up! Time's up
