ap chemistry unit 1 practice test mcq | Exams Chemistry | Docsity (2024)

Download ap chemistry unit 1 practice test mcq and more Exams Chemistry in PDF only on Docsity! Unit 1 Practice ProblemsAtomic Structure and PropertiesMultiple Choice Questions: Choose the best answer for each of the followingquestions.Cycling enthusiasts often prefer bicycles made with titanium frames. Titanium isresistant to corrosion and fatigue, has a significantly lower density than steel, andseems to have a natural shock absorbing ability. Suppose a high-quality titaniumframe contains 1300 g of titanium. How many moles of titanium does this framecontain? (A calculator can be used)A) 27.16 molesB) 62.23 molesC) 1.6 x 1026 molesD) 27 moles2. Ibuprofen is a common pain reliever and anti-inflammatory. Its formula is Ci3H1sO02.What percent by mass of ibuprofen is the carbon? (A calculator can be used)A) 75.68 %B) 33.33%Cc) 13.00%D) 39.39%3. Lithium compounds are useful in creating electronics such as rechargeablebatteries. A lithium compound is analyzed and found to be 18.7% Li, 16.3% C and theremainder is O. What is the empirical formula of the compound?A) LizcosB) LisCO«C) Lico.D) Lico4. A 36.04 g sample of water is boiled. When the steam expands to fill the vessel howmany atoms of hydrogen would be found in the sample? (No calculator needed)A) 1.204 x 1074 atomsB) 2.408 x 1024 atomsCc) 6.022 x 1023 atomsD) 3.612 x 1074 atoms5. A sample of a compound contains 3.21 g of sulfur and 11.4 g of fluorine. Which ofthe following represents the empirical formula of the compound. (No calculator is.needed)A) SF2B) SFsC) SFa6. A sample of CuSO. « 5H20 is heated to in a crucible to remove the water. When theresults are analyzed the % water is less than expected. Which explanation for thediscrepancy is the best?A) After all the water is evaporated, some of the CuSO. spatters out of the crucibleresulting in a greater mass lost.B) The sample is not heated enough to evaporate all of the water.C) The sample is heated too much and the compound decomposes into a salt and anonmetal oxide.D) Only half of the original sample is heated.B) 1s_T|_ 2s _t|_C) 1s _t|_ 2s _t|_ 2p _t__Tt___D) [Ar] 4s _t]_ 3d _f]__f_ _T__T__t_15. Represents an atom that has four valence electronsA) 1s _f|_ 2s _1Tl_B) 1s _t|_ 2s _T|_ 2p _T__f___C) 1s _f|_ 2s _t|_ 2p _tl__Tl__tl_D) [Ar] 4s _t|_ 3d _f)__f_ _f__t__t_16. Represents an atom of a transition metalA) 1s _}|_ 2s _}|_B) 1s _{|_ 2s _t|_ 2p _f__t___C) 1s _t|_ 2s _tl_ 2p tl) _f)_ Tl©) [Ar] 4s _f!_ 34 fl _f_ _f__t__t_17. Which electronic configuration represents atoms of the element having thhighest second ionization energy?A) 1s?2s72p*B) 1s?2s72p*C) 1s72s?2p*%3s'D) 1s*2s72p"3s?18. The elements in which of the following have most nearly the same atomic radiusA) Be, B, C, NB) Ne, Ar, Kr, XeC) Mg, Ca, Sr, BaD) C, P, Se, !19. All of the following statements concerning the characteristics of the halogens a1true EXCEPT...A) The first ionization energies (potentials) decrease as the atomic numbers of |halogens increase.B) Fluorine atoms have the smallest radii.C) lodine liberates free bromine from a solution of bromide ion.D) Fluorine is the most electronegative of the halogens.20. The effective nuclear charge experienced by the outermost electron of Na isdifferent than the effective nuclear charge experienced by the outermost electronof Ne. This difference best accounts for which of the following?A) Na has a higher melting point than Ne.B) Na has fewer naturally occurring isotopes than Ne.C) Na has a greater density at standard conditions than Ne.D) Na has a lower first ionization energy than Ne.21. The first ionization energy of magnesium is 738 kJ/mol. A good estimate for thesecond ionization energy of magnesium isA) 370 kJ/molB) 735 kJ/molC) 1450 kJ/molD) 6900 kJ/mol26. Nitrogen’s electronegativity value is between those of phosphorus and oxygen.Which of the following correctly describes the relationship between the threevalues?A) the value for nitrogen is less than that of phosphorus because nitrogen islarger, but greater than that of oxygen because nitrogen has a greater effectivenuclear chargeB) the value for nitrogen is less than that of phosphorus because nitrogen hasfewer protons but greater than that of oxygen because nitrogen has lessvalence electrons.C) the value for nitrogen is greater than that of phosphorus because nitrogen hasless electrons, but less than that of oxygen because nitrogen is smaller.D) the value for nitrogen is greater than that of phosphorus because nitrogen is‘smaller, but less than that of oxygen because nitrogen has a smaller effectivenuclear charge.27. The first ionization energy for a neutral atom of chlorine is 1.25 MJ/mol and thefirst ionization energy for a neutral atom of argon is 1.52 MJ/mol. How would thefirst ionization energy value for a neutral atom of potassium compare to thosevalues?A) it would be greater than both because potassium carries a greater nuclearcharge than either chlorine or argon.B) it would be greater than both because the size of a potassium atom is smallerthan an atom of either chlorine or argon.C) it would be less than both because there are more electrons in potassium,D) it would be less than both because a valence electron of potassium is fartherfrom the nucleus than one of either chlorine or argon.28. A photoelectron spectrum for which of the following atoms would show peaks atexactly three different binding energies?29. Which element would have a photoelectron spectra in which the peakrepresenting electrons with the lowest ionization energy would be three timeshigher than each of all of its other peaks individually?A) carbonB) nitrogen 30. Which of the following represents the first electron affinity of chlorine?A) Cl(g) + e- — CI(g)B) Ci(g) + e- — Cl(g)C) Cl(g) — Cl-(g) + e-D) Cl2(g) — 2Ct(g)31. Which of the elements above has the smallest ionic radius for its most commonlyfound ion?A) oOB) LaC) RbD) Mg32. Which of the following best helps to account for the fact that the F- ion is smallerthan the O02 ion?A) F- has a larger nuclear mass than O2 has.B) F- has a larger nuclear charge than O2- has.C) F- is more electronegative than O2- is.D) F- is more polarizable than O is.33. The following link provides online spectra to analyze in multiple choice questionformat. Write answers on your paper in addition to answering online.Online PES practice questions