Regents Chemistry Practice Test

50 Questions | Total Attempts: 171

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Chemistry Practice Quizzes & Trivia

Questions and Answers
  • 1. 
    1. The modern model of the atom is based on the work of 
    • A. 

      One scientist over a short period of time

    • B. 

      One scientist over a long period of time

    • C. 

      Many scientists over a short period of time

    • D. 

      many scientists over a long period of time

  • 2. 
    1. Which statement is true about the charges assigned to an electron and a proton? 
    • A. 

      Both an electron and a proton are positive.

    • B. 

      An electron is positive and a proton is nega- tive.

    • C. 

      An electron is negative and a proton is posi- tive.

    • D. 

      Both an electron and a proton are negative.

  • 3. 
    1. In the wave-mechanical model, an orbital is a region of space in an atom where there is 
    • A. 

      A high probability of finding an electron

    • B. 

      A high probability of finding a neutron

    • C. 

      A circular path in which electrons are found

    • D. 

      A circular path in which neutrons are found

  • 4. 
    1. What is the charge of the nucleus in an atom of oxygen-17? 
    • A. 

      0

    • B. 

      -2

    • C. 

      +8

    • D. 

      +17

  • 5. 
    Which pair of symbols represents a metalloid and a noble gas? 
    • A. 

      Si and Bi

    • B. 

      As and Ar

    • C. 

      Ge and Te

    • D. 

      Ne and Xe

  • 6. 
    Which statement describes a chemical property of iron? 
    • A. 

      Iron can be flattened into sheets.

    • B. 

      Iron conducts electricity and heat.

    • C. 

      Iron combines with oxygen to form rust.

    • D. 

      Iron can be drawn into a wire.

  • 7. 
    Given the reaction: N2(g) + 3 H2(g) <-> 2 NH3(g) What is the mole-to-mole ratio between nitro- gen gas and hydrogen gas? 
    • A. 

      1:2

    • B. 

      1:3

    • C. 

      2:2

    • D. 

      2:3

  • 8. 
    What is the percent by mass of oxygen in propanal, CH3CH2CHO? 
    • A. 

      10.0%

    • B. 

      27.6%

    • C. 

      38.1%

    • D. 

      62.1%

  • 9. 
    Covalent bonds are formed when electrons are    
    • A. 

      Transferred from one atom to another

    • B. 

      Captured by the nucleus

    • C. 

      Mobile within a metal

    • D. 

      Shared between two atoms

  • 10. 
    Which type of molecule is CF4?    
    • A. 

      Polar, with a symmetrical distribution of charge

    • B. 

      Polar, with an asymmetrical distribution of charge

    • C. 

      Nonpolar, with a symmetrical distribution of charge

    • D. 

      Nonpolar, with an asymmetrical distribution of charge

  • 11. 
    Which change occurs when a barium atom loses two electrons? 
    • A. 

      It becomes a negative ion and its radius decreases.

    • B. 

      It becomes a negative ion and its radius increases.

    • C. 

      It becomes a positive ion and its radius decreases.

    • D. 

      It becomes a positive ion and its radius increases.

  • 12. 
    1. Which of these elements has the least attraction for electrons in a chemical bond? 
    • A. 

      Oxygen

    • B. 

      Fluorine

    • C. 

      Nitrogen

    • D. 

      Chlorine

  • 13. 
    1. Conductivity in a metal results from the metal atoms having 
    • A. 

      High electronegativity

    • B. 

      High ionization energy

    • C. 

      highly mobile protons in the nucleus

    • D. 

      highly mobile electrons in the valence shell

  • 14. 
    1. Recovering the salt from a mixture of salt and water could best be accomplished by
    • A. 

      Evaporation

    • B. 

      Filtration

    • C. 

      Paper chromatography

    • D. 

      Density determination

  • 15. 
    1. The average kinetic energy of water molecules is greatest in which of these samples? 
    • A. 

      10 g of water at 35°C

    • B. 

      10 g of water at 55°C

    • C. 

      100 g of water at 25°C

    • D. 

      100 g of water at 45°C

  • 16. 
    1. Helium is most likely to behave as an ideal gas when it is under 
    • A. 

      High pressure and high temperature

    • B. 

      High pressure and low temperature

    • C. 

      Low pressure and high temperature

    • D. 

      Low pressure and low temperature

  • 17. 
    1. At STP, the element oxygen can exist as either O2 or O3 gas molecules. These two forms of the element have 
    • A. 

      The same chemical and physical properties

    • B. 

      The same chemical properties and different physical properties

    • C. 

      Different chemical properties and the same physical properties

    • D. 

      Different chemical and physical properties

  • 18. 
    Which sample contains particles in a rigid, fixed, geometric pattern? 
    • A. 

      CO2 (aq)

    • B. 

      HCl (g)

    • C. 

      H2O (l)

    • D. 

      KCl (s)

  • 19. 
    Given the reaction at 25°C: Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g) The rate of this reaction can be increased by using 5.0 grams of powdered zinc instead of a 5.0-gram strip of zinc because the powdered zinc has 
    • A. 

      Lower kinetic energy

    • B. 

      Lower concentration

    • C. 

      More surface area

    • D. 

      More zinc atoms

  • 20. 
    Which statement about a system at equilibrium is true? 
    • A. 

      The forward reaction rate is less than the reverse reaction rate.

    • B. 

      The forward reaction rate is greater than the reverse reaction rate.

    • C. 

      The forward reaction rate is equal to the reverse reaction rate.

    • D. 

      The forward reaction rate stops and the reverse reaction rate continues.

  • 21. 
    A catalyst increases the rate of a chemical reaction by 
    • A. 

      Lowering the activation energy of the reaction

    • B. 

      Lowering the potential energy of the products

    • C. 

      Raising the temperature of the reactants

    • D. 

      Raising the concentration of the reactants

  • 22. 
    Which element must be present in an organic compound? 
    • A. 

      Hydrogen

    • B. 

      Oxygen

    • C. 

      Carbon

    • D. 

      Nitrogen

  • 23. 
    Which compound is a saturated hydrocarbon?    
    • A. 

      Hexane

    • B. 

      Hexene

    • C. 

      Hexanol

    • D. 

      Hexanal

  • 24. 
    1. Which of these compounds has chemical prop- erties most similar to the chemical properties of ethanoic acid? 
    • A. 

      C3H7COOH

    • B. 

      C2H5OH

    • C. 

      C2H5COOC2H5

    • D. 

      C2H5OC2H5

  • 25. 
    1. Given the reaction that occurs in an electrochemical cell:  Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)     During this reaction, the oxidation number of Zn changes from
    • A. 

      0 to +2

    • B. 

      0 to -2

    • C. 

      +2 to 0

    • D. 

      -2 to 0