ATI TEAS Guide To Science | Understanding Chemistry Question Review
ATI TEAS Science Chemistry
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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.
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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.
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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.
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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.
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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.
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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.
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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
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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).
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