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ATI TEAS Guide To Science | Understanding Chemistry Question Review

September 1, 2020 //  by nursecheung//  Leave a Comment

ATI TEAS Guide To Science | Understanding Chemistry Question Review

ATI TEAS Science Chemistry

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  1. Question 1 of 8
    1. Question

    A solution with a pH of 13 is considered to be which of the following?

    Correct

    A solution with a pH of 13 is a strong base. Household bleach and oven cleaner are two examples of strong bases.

    Incorrect

    A solution with a pH of 13 is a strong base. Household bleach and oven cleaner are two examples of strong bases.

  2. Question 2 of 8
    2. Question

    A hydrocarbon with one triple bond is called an ______.

    Which of the following correctly completes the sentence above?

    Correct

    An alkane has a single bond. An alkene has a double bond. Alkynes are characterized by a triple bond. An anion refers to the negatively charged end of an ionic bond.

    Incorrect

    An alkane has a single bond. An alkene has a double bond. Alkynes are characterized by a triple bond. An anion refers to the negatively charged end of an ionic bond.

  3. Question 3 of 8
    3. Question

    Which of the following is the chemical formula for pentane?

    Correct

    The chemical formula for pentane is C5H12. A member of the alkane family, it has five carbon atoms, giving it its name.

    Incorrect

    The chemical formula for pentane is C5H12. A member of the alkane family, it has five carbon atoms, giving it its name.

  4. Question 4 of 8
    4. Question

    Which of the following describes the phase change of sublimation?

    Correct

    Sublimation is the process in with a solid skips the liquid state and becomes a gas immediately. This somewhat rare phase change is seen in special compounds like dry ice, which goes from a solid to steam at room temperature. Choice A, solid to liquid, is known as melting. Choice B, liquid to gas, can be characterized as vaporization, evaporation, or even boiling, depending on the energy input. Choice D, liquid to solid, is typically known as freezing.

    Incorrect

    Sublimation is the process in with a solid skips the liquid state and becomes a gas immediately. This somewhat rare phase change is seen in special compounds like dry ice, which goes from a solid to steam at room temperature. Choice A, solid to liquid, is known as melting. Choice B, liquid to gas, can be characterized as vaporization, evaporation, or even boiling, depending on the energy input. Choice D, liquid to solid, is typically known as freezing.

  5. Question 5 of 8
    5. Question

    A solid item (X) with the density of 0.917 g/cm3 is placed in a beaker containing an aqueous substance (Y) with the density of 1.0000 g/cm3.

    Which of the following things do you expect to happen?

    Correct

    The relative densities of solids and liquids are important for determining how they will react. A solid that is denser than a liquid will sink when placed in it. A solid that is less dense will float.

    Incorrect

    The relative densities of solids and liquids are important for determining how they will react. A solid that is denser than a liquid will sink when placed in it. A solid that is less dense will float.

  6. Question 6 of 8
    6. Question

    ______H3PO4 + ______LiOH –> ______H2O + ______Li3PO4

    Which of the following correctly balances the acid-base reaction above?

    Correct

    To balance the equation, we must make the left side have the same number of elements as the right:

    ______H3PO4 + ______LiOH –> ______H2O + ______Li3PO4

    The elements in this example number as follows:

    Element           Reactants        Products

    H                     4                      2

    P                      1                      1

    O                     5                      5

    Li                     1                      3

    The Li (lithium) stands out as being unbalanced. Adding a coefficient of 3 to the reactant gets us this distribution:

    ______H3PO4 + 3LiOH –> ______H2O + ______Li3PO4

    Element           Reactants        Products

    H                     6                      2

    P                      1                      1

    O                     7                      5

    Li                     3                      3

    Since the Li is balanced, we want to change the other molecule in the product, like this:

    ______H3PO4 + 3LiOH –> 3H2O + ______Li3PO4

    The elements in this example number:

    Element           Reactants        Products

    H                     6                      6

    P                      1                      1

    O                     7                      7

    Li                     3                      3

    The two sides are balanced by adding the coefficient 3 to the product.

    Incorrect

    To balance the equation, we must make the left side have the same number of elements as the right:

    ______H3PO4 + ______LiOH –> ______H2O + ______Li3PO4

    The elements in this example number as follows:

    Element           Reactants        Products

    H                     4                      2

    P                      1                      1

    O                     5                      5

    Li                     1                      3

    The Li (lithium) stands out as being unbalanced. Adding a coefficient of 3 to the reactant gets us this distribution:

    ______H3PO4 + 3LiOH –> ______H2O + ______Li3PO4

    Element           Reactants        Products

    H                     6                      2

    P                      1                      1

    O                     7                      5

    Li                     3                      3

    Since the Li is balanced, we want to change the other molecule in the product, like this:

    ______H3PO4 + 3LiOH –> 3H2O + ______Li3PO4

    The elements in this example number:

    Element           Reactants        Products

    H                     6                      6

    P                      1                      1

    O                     7                      7

    Li                     3                      3

    The two sides are balanced by adding the coefficient 3 to the product.

  7. Question 7 of 8
    7. Question

    ______C2H6 + ______O2 –> ______CO2 + ______H2O

    Which of the following correctly balances the combustion reaction above?

    Correct

    To balance the equation, we must make the left side have the same number of elements as the right:

    ______C2H6 + ______O2 –> ______CO2 + ______H2O

    The elements in this example number as follows:

    Element           Reactants        Products

    C                      2                      1

    H                     6                      2

    O                     2                      3

    Let’s start by balancing H (hydrogen):

    ______C2H6 + ______O2 –> ______CO2 + 3H2O

    That gives us the following distribution:

    Element           Reactants        Products

    C                      2                      1

    H                     6                      6

    O                     2                      5

    Now, C (carbon):

    ______C2H6 + ______O2 –> 2CO2 + ______3H2O

    That gives us the following distribution:

    Element           Reactants        Products

    C                      2                      2

    H                     6                      6

    O                     2                      7

    To balance O (oxygen), we would need to multiply the reactant by 3.5. Coefficients must be whole numbers. We can double everything to fix the problem:

    2C2H6 + 7O2 —> 4CO2 + 6H2O

    That gives us the following distribution:

    Element           Reactants        Products

    C                      4                      4

    H                     12                    12

    O                     14                    14

    The answer is:

    2C2H6 + 7O2 —> 4CO2 + 6H2O

    Incorrect

    To balance the equation, we must make the left side have the same number of elements as the right:

    ______C2H6 + ______O2 –> ______CO2 + ______H2O

    The elements in this example number as follows:

    Element           Reactants        Products

    C                      2                      1

    H                     6                      2

    O                     2                      3

    Let’s start by balancing H (hydrogen):

    ______C2H6 + ______O2 –> ______CO2 + 3H2O

    That gives us the following distribution:

    Element           Reactants        Products

    C                      2                      1

    H                     6                      6

    O                     2                      5

    Now, C (carbon):

    ______C2H6 + ______O2 –> 2CO2 + ______3H2O

    That gives us the following distribution:

    Element           Reactants        Products

    C                      2                      2

    H                     6                      6

    O                     2                      7

    To balance O (oxygen), we would need to multiply the reactant by 3.5. Coefficients must be whole numbers. We can double everything to fix the problem:

    2C2H6 + 7O2 —> 4CO2 + 6H2O

    That gives us the following distribution:

    Element           Reactants        Products

    C                      4                      4

    H                     12                    12

    O                     14                    14

    The answer is:

    2C2H6 + 7O2 —> 4CO2 + 6H2O

  8. Question 8 of 8
    8. Question

    Acids provide H+ ions in water, while bases provide OH– ions. Which of the following is a pair of bases?

    Correct

    Sodium hydroxide (NaOH) and potassium hydroxide (KOH) are both bases. Barium hydroxide (Ba(OH)2) is also a base, but it is paired with phosphoric acid (H3PO4), so choice D is incorrect. Choice A contains hydrochloric acid (HCI) and nitric acid (HNO3), while choice B contains sulphuric acid (H2SO4) and nitric acid (HNO3).

    Incorrect

    Sodium hydroxide (NaOH) and potassium hydroxide (KOH) are both bases. Barium hydroxide (Ba(OH)2) is also a base, but it is paired with phosphoric acid (H3PO4), so choice D is incorrect. Choice A contains hydrochloric acid (HCI) and nitric acid (HNO3), while choice B contains sulphuric acid (H2SO4) and nitric acid (HNO3).








Category: ATI TEAS Question Review Series, Uncategorized

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