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WorksheetsAP Chemistry
Total questions: 15
Worksheet time: 15mins
How many carbon atoms are contained in 2.8 g of C2H4 ?
1.2 x 10^23
3.0 x 10^23
6.0 x 10^23
1.2 x 10^24
6.0 x 10^24
Which of the following elements has the mass spectrum represented above?
Nb
Mo
U
Cf
When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl by mass. What is the empirical formula for this compound?
(a)
To gravimetrically analyze the silver content of a piece of jewelry made from an alloy of Ag and Cu, a student dissolves a small preweighed sample in HNO3(aq). Ag+(aq)and Cu2+(aq) ions form in the solution. Which of the following should be the next step in the analytical process?
Centrifuging the solution to isolate the heavier ions
Evaporating the solution to recover the dissolved nitrates
Adding enough base solution to bring the pH up to 7.0
Adding a solution containing an anion that forms an insoluble salt with only one of the metal ions
The mass percent of carbon in pure glucose, C6H12O6, is 40.0 percent. A chemist analyzes an impure sample of glucose and determines that the mass percent of carbon is 38.2 percent. Which of the following impurities could account for the low mass percent of carbon in the sample?
Water, H2O
Ribose, C5H10O5
Fructose, C6H12O6, an isomer of glucose
Sucrose, C12H22O11
The effective nuclear charge experienced by the outermost electron of Na is different than the effective nuclear charge experienced by the outermost electron of Ne. This difference best accounts for which of the following?
Na has a greater density at standard conditions than Ne.
Na has a lower first ionization energy than Ne.
Na has a higher melting point than Ne.
Na has a higher neutron-to-proton ratio than Ne.
Na has fewer naturally occurring isotopes than Ne.
Write the ground-state electron configuration of the O−2 ion?
1s2 2s2
1s2 2s2 2p4
1s2 2s2 2p6
1s2 2s2 2p5 3s2
The photoelectron spectra for H and He are represented above. Which of the following statements best accounts for the fact that the peak on the He spectrum is farther to the left and higher than the peak on the H spectrum?
He has an additional valence electron in a higher energy level than the valence electron in H
.
He has a greater nuclear charge than H and an additional electron in the same energy level.
He has a completely filled valence shell in which the electrons are a greater distance from the nucleus than the distance between the H nucleus and its electron.
It takes longer for the electrons in He to be removed due to the higher nuclear mass of He.
A sample containing atoms of C and F was analyzed using x-ray photoelectron spectroscopy. The portion of the spectrum showing the 1s peaks for atoms of the two elements is shown above. Which of the following correctly identifies the 1s peak for the F atoms and provides an appropriate explanation?
Peak X, because F has a smaller first ionization energy than C has.
Peak X, because F has a greater nuclear charge than C has.
Peak Y, because F is more electronegative than C is.
Peak Y, because F has a smaller atomic radius than C has.
Based on the ionization energies of element X given in the table above, which of the following is most likely the empirical formula of an oxide of element X?
XO2
X2O
X2O3
X2O5
In 1.00 mol of potassium zirconium sulfate trihydrate, K4Zr(SO4)4 • 3 H2O, there are
3 × 6.02 × 10^23 hydrogen atoms
6.02 × 10^23 sulfur atoms
4 × 6.02 × 10^23 potassium atoms
4 moles of oxygen atoms
What is the empirical formula of an oxide of chromium that is 48 percent oxygen by mass?
CrO
CrO2
CrO3
Cr2O
What is the hybridization of the central atom in the molecule \( \text{XeF}_4 \)?
sp
sp^2
sp^3
sp^3d^2
Which of the following is the correct balanced equation for the combustion of ethane (\( \text{C}_2\text{H}_6 \))?
\( \text{C}_2\text{H}_6 + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} \)
\( 2\text{C}_2\text{H}_6 + 7\text{O}_2 \rightarrow 4\text{CO}_2 + 6\text{H}_2\text{O} \)
\( \text{C}_2\text{H}_6 + 3.5\text{O}_2 \rightarrow 2\text{CO}_2 + 3\text{H}_2\text{O} \)
\( 2\text{C}_2\text{H}_6 + 5\text{O}_2 \rightarrow 2\text{CO}_2 + 6\text{H}_2\text{O} \)
A solution is prepared by dissolving 0.50 moles of \( \text{NaCl} \) in enough water to make 1.0 L of solution. What is the molarity of the solution?
0.25 M
0.50 M
1.0 M
2.0 M
