SAT Chemistry Online Practice Test 3: Part D

Test Information

Question 16 questions

Time 10 minutes

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Directions: Every question below contains two statements, I in the left-hand column and II in the right-hand column. For each question, decide if statement I is true or false and whether statement II is true or false, and fill in the corresponding T or F ovals on your answer sheet. *Fill in oval CE only if statement II is a correct explanation of statement I.

1. The structure of SO3 is shown by using more than one
structural formula
BECAUSE
SO3 is very unstable and resonates between these possible structures.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

2. When the G of a reaction at a given temperature is negative, the reaction occurs spontaneously
BECAUSE
when G is negative, H is also negative.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

3. One mole of CO2 has a greater mass than 1 mole of H2O
BECAUSE
the molecular mass of CO2 is greater than the molecular mass of H2O.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

4. Hydrosulfuric acid is often used in qualitative tests
BECAUSE
H2S(aq) reacts with many metallic ions to give colored precipitates.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

5. Crystals of sodium chloride go into solution in water as ions
BECAUSE
the sodium ion has a 1+ charge and the chloride ion has a 1- charge and they are hydrated by the water molecules.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

6. If some phosphoric acid, H3PO4, is added to the equilibrium mixture represented by the equation H3PO4 + H2O ←→ PO43-
+ H3O+, the concentration of H3O+ decreases
BECAUSE
the equilibrium constant of a reaction changes as the concentration of the reactants changes

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

7. The Hreaction of a particular reaction can be arrived at by the summation of the Hreaction values of two or more reactions that, added together, give the Hreaction of the particular reaction
BECAUSE
Hess's Law conforms to the First Law of Thermodynamics, which states that the total energy of the universe is a constant.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

8. In a reaction that has both a forward and a reverse reaction,
A + B reverse.jpg AB, when only A and B are introduced into a reacting vessel, the forward reaction rate is the highest at the beginning and begins to decrease from that point until equilibrium is reached
BECAUSE
the reverse reaction does not begin until equilibrium is reached.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

9. At equilibrium, the forward reaction and reverse reaction stop
BECAUSE
at equilibrium, the reactants and products have reached the equilibrium concentrations.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

10. The hydrid orbital form of carbon in acetylene is believed to be the sp form
BECAUSE
C2H2 is a linear compound with a triple bond between the carbons.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

11. The weakest of the bonds between molecules are coordinate covalent bonds
BECAUSE
coordinate covalent bonds represent the weak attractive force of the electrons of one molecule for the positively charged nucleus of another.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

12. A saturated solution is not necessarily concentrated
BECAUSE
dilute and concentrated are terms that relate only to the relative amount of solute dissolved in the solvent.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

13. Lithium is the most active metal in the first group of the Periodic Table
BECAUSE
lithium has only one electron in the outer energy level.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

14. The anions migrate to the cathode in an electrolytic cell
BECAUSE
positively charged ions are attracted to the negatively charged cathode.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

15. The atomic number of a neutral atom that has a mass of 39
and has 19 electrons is 19
BECAUSE
the number of protons in a neutral atom is equal to the number of electrons.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE

16. For an element with an atomic number of 17, the most probable oxidation number is +1
BECAUSE
the outer energy level of the halogen family has a tendency to add one electron to itself.

A. T,T
B. T,F
C. F,T
D. F,F
E. T,T,CE