Exam (elaborations)

Straighterline Chemistry Final exam with correct answers 2024

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Course
Straighterline Chemis

Institution
Straighterline Chemis

findings that are summarized based on a pattern or trend correct answers Law tentative explanation for a set of observations correct answers Hypothesis If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? correct answers Homogeneous mixture doe...

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straighterline chemistry final

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Course Straighterline Chemis

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Straighterline Chemistry Final

findings that are summarized based on a pattern or trend correct
answers Law
tentative explanation for a set of observations correct answers
Hypothesis
If a liquid contains 60% sugar and 40% water throughout its composition
then what
called? is it answers Homogeneous
correct
mixture
does not have a uniform composition throughout correct answers
Heterogeneous
mixtur
e
represents a physical change? correct answers Water, when heated,
forms steam.
How many micrograms are in 65.3 kg? correct answers e. 6.53 ×
1010 μg
A smart phone has dimensions of 4.9 inches (height), 2.3 inches
(width) and (depth).
millimeters 8.0 What is the volume of the smart phone in cubic
centimeters?
2.54 (1 inanswers
cm) correct = 58
cm3
Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to correct answers
0.0610 in3
What terms defines a mass which is exactly equal to 1/12 the mass of one
carbon-12
atom? correct answers Atomic
mass unit
How many neutrons are there in an atom of lead whose mass number is
208? correct
answers
126
Which of these elements is chemically similar to magnesium? correct
answers Calcium
C(graphite) and C(diamond) are examples of: correct answers allotropes
of carbon.
The 80Br- ion has correct answers 35 protons, 45 neutrons, 46
electrons.
The formula for sodium sulfide is correct answers
Na2S
Which one of the following formulas of ionic compounds is the least likely to
be correct?
correct answers
Ca2NO3
What is the name of ClO - ion? correct answers
hypochlorite

,Which of the following is a molecular formula for a compound with an
empirical
of formula
CH? correct answers
C6H6
What is the energy in joules of a mole of photons associated with
red light of 7.00 × 102 nm? (c = 3.00 × 108 m/s; h = 6.63 × 10-34 J • s;
wavelength
NA = /mole)
1023 6.022 ×correct answers 1.71 ×
105 J
Which is the correct electron configuration for gold? correct answers
[Xe]4f145d106s1
Use the Rydberg equation to calculate the frequency of a photon absorbed
when the atom undergoes a transition from n1 = 2 to n2 = 4. (R =
hydrogen
1.096776
c = 3.00 ××108 107m/s)
m-1;correct answers 6.17 ×
1014 s-1
A 6.0-gram champagne cork is shot out of an opened champagne bottle and
traveled
a at 65 km/hour. Calculate the de Broglie wavelength (in meters)
speed of
of the cork.
correct answers 6.1 × 10-
33 m
A(n) is a point at which a standing wave has zero amplitude.
correct
answers
node
Calculate the wavelength associated with a 20Ne+ ion moving at a velocity
of 2.0The
m/s. × 105
atomic mass of Ne-20 is 19.992 amu. (1 amu = 1.66 × 10-24 g and
h = 6.63
10-34 J•× s) correct answers 1.0 × 10-
13 m
The Pauli exclusion principle states that no electrons within an atom can
have the quantum numbers. correct
same
answers 2; 4
Emission spectra correct answers can be used to identify
unknown atoms.
Which one of the following equations correctly represents the process
relating toenergy
ionization the of X? correct answers X(g) → X+
(g) + e-
How does atomic radius change as you move across the periodic
table? correct
answers Atomic radius decreases moving from left to right across a
period andfrom top to
increases
bottom.
Which of these choices is the electron configuration of the iron(III) ion?
correct answers
a.
[Ar]3d5
An element with the general electron configuration for its outermost
electrons
would of which
be in ns2np1 element group? correct
answers b. 3A
The effective nuclear charge for an atom is less than the actual nuclear
charge due
correct to
answers
shielding.

, Which pair of ions exhibits the greatest attractive force between them?
correctand
Mg2+ answers
O2-
Which of the following is a basic oxide? correct
answers MgO
Which of these compounds is most likely to be covalent? correct
answers CS2
In the Lewis structure of the iodate ion, IO3-, that satisfies the octet rule,
the formal
charge on the central iodine atom is correct
answers 2.
Which molecule has the largest dipole moment? correct
answers HF
In which of the following species does the central atom violate the octet
rule? correct
answers b.
SF4
Which of these ionic solids would have the largest lattice energy?
correct
CaCl answers
2
The total number of bonding electrons in a molecule of formaldehyde (H2CO)
is correct
answers
8.
Which of the following molecules has a nonzero dipole moment? correct
answers SF2
According to the VSEPR model, a molecule with the general formula AB5
with on
pair onethe
lonecentral atom will have a molecular geometry correct
answers
square
pyramidal
Which is the most reasonable prediction for the three F-Br-F bond angles
in BrF3?answers c. 86°, 86°, and
correct
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?
answers c. correct
sp3
According to the VSEPR model, which one of the following molecules and
ions will have at least one 90° bond angle in it? (In each case, except water,
definitely
the central
atom is the first one in the formula.) correct answers
c. PCl5
What is the number of lone electron pairs on the central atom of a
moleculepyramidal
trigonal having a molecular geometry, such as NH3? correct
answers a. 1
For which one of the following molecules is the indicated type of
hybridizationfor
appropriate not
the central atom? correct answers a.
BeCl2; sp2
According to the VSEPR model, the predicted molecular geometry of
ammonia,
correct NH3, is
answers e. trigonal
pyramidal.

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