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Straighterline Chemistry Final Test Questions and Answers
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Straighterline Chemistry Final Testfindings that are summarized based on a pattern or trend - answer Law
tentative explanation for a set of observations - answer Hypothesis
If a liquid contains 60% sugar and 40% water throughout its composition then what is it
called? - answer Homogeneous mixture
does not have a uniform composition throughout - answer Heterogeneous mixture
represents a physical change? - answer Water, when heated, forms steam.
How many micrograms are in 65.3 kg? – answer e. 6.53 × 1010 μg
A smart phone has dimensions of 4.9 inches (height), 2.3 inches (width) and 8.0
millimeters (depth). What is the volume of the smart phone in cubic centimeters? (1 in =
2.54 cm) - answer58 cm3
Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to - answer0.0610 in3
What terms defines a mass which is exactly equal to 1/12 the mass of one carbon-12
atom? - answer Atomic mass unit
How many neutrons are there in an atom of lead whose mass number is 208? -
answer126
Which of these elements is chemically similar to magnesium? - answer Calcium
C(graphite) and C(diamond) are examples of: - answer allotropes of carbon.
The 80Br- ion has - answer35 protons, 45 neutrons, 46 electrons.
The formula for sodium sulfide is - answerNa2S
Which one of the following formulas of ionic compounds is the least likely to be correct?
- answerCa2NO3
What is the name of ClO - ion? - answer hypochlorite
Which of the following is a molecular formula for a compound with an empirical formula
of CH? - answerC6H6
,What is the energy in joules of a mole of photons associated with red light of
wavelength 7.00 × 102 nm? (c = 3.00 × 108 m/s; h = 6.63 × 10-34 J • s; NA = 6.022 ×
1023 /mole) - answer1.71 × 105 J
Which is the correct electron configuration for gold? - answer[Xe]4f145d106s1
Use the Rydberg equation to calculate the frequency of a photon absorbed when the
hydrogen atom undergoes a transition from n1 = 2 to n2 = 4. (R = 1.096776 × 107 m-1;
c = 3.00 × 108 m/s) - answer6.17 × 1014 s-1
A 6.0-gram champagne cork is shot out of an opened champagne bottle and traveled at
a speed of 65 km/hour. Calculate the de Broglie wavelength (in meters) of the cork. -
answer6.1 × 10-33 m
A(n) _________ is a point at which a standing wave has zero amplitude. - answer node
Calculate the wavelength associated with a 20Ne+ ion moving at a velocity of 2.0 × 105
m/s. The atomic mass of Ne-20 is 19.992 amu. (1 amu = 1.66 × 10-24 g and h = 6.63 ×
10-34 J • s) - answer1.0 × 10-13 m
The Pauli exclusion principle states that no ____ electrons within an atom can have the
same ____ quantum numbers. - answer2; 4
Emission spectra - answer can be used to identify unknown atoms.
Which one of the following equations correctly represents the process relating to the
ionization energy of X? – answer X(g) → X+(g) + e-
How does atomic radius change as you move across the periodic table? - answer
Atomic radius decreases moving from left to right across a period and increases from
top to bottom.
Which of these choices is the electron configuration of the iron(III) ion? – answer a.
[Ar]3d5
An element with the general electron configuration for its outermost electrons of ns2np1
would be in which element group? – answer b. 3A
The effective nuclear charge for an atom is less than the actual nuclear charge due to -
answer shielding.
Which pair of ions exhibits the greatest attractive force between them? - answerMg2+
and O2-
Which of the following is a basic oxide? - answerMgO
, Which of these compounds is most likely to be covalent? - answerCS2
In the Lewis structure of the iodate ion, IO3-, that satisfies the octet rule, the formal
charge on the central iodine atom is - answer2.
Which molecule has the largest dipole moment? - answerHF
In which of the following species does the central atom violate the octet rule? - answerb.
SF4
Which of these ionic solids would have the largest lattice energy? - answerCaCl2
The total number of bonding electrons in a molecule of formaldehyde (H2CO) is -
answer8.
Which of the following molecules has a nonzero dipole moment? - answerSF2
According to the VSEPR model, a molecule with the general formula AB5 with one lone
pair on the central atom will have a ______ molecular geometry - answersquare
pyramidal
Which is the most reasonable prediction for the three F-Br-F bond angles in BrF3? -
answerc. 86°, 86°, and 172°
When PCl5 solidifies it forms PCl4+cations and PCl6- anions. According to valence
bond theory, what hybrid orbitals are used by phosphorus in the PCl4+cation? -
answerc. sp3
According to the VSEPR model, which one of the following molecules and ions will
definitely have at least one 90° bond angle in it? (In each case, except water, the central
atom is the first one in the formula.) - answerc. PCl5
What is the number of lone electron pairs on the central atom of a molecule having a
trigonal pyramidal molecular geometry, such as NH3? - answera. 1
For which one of the following molecules is the indicated type of hybridization not
appropriate for the central atom? - answera. BeCl2; sp2
According to the VSEPR model, the predicted molecular geometry of ammonia, NH3, is
- answere. trigonal pyramidal.
What is the mass of one copper atom? (NA = 6.022 × 1023 mol-1) - answera. 1.055 ×
10-22 g
What is the percent sulfur in iron(III) sulfate? - answerc. 24%
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