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Straighterline Chemistry Final Questions and Correct Answers the Latest Update and Recommended Version
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What is the term used for findings that are summarized based on a pattern or trend? a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction a. Law Which of the following is a tentative explanation for a set of observations? Select one: a. Law b. Hypothesis c. Theory d. Phenomena e...

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  • October 24, 2024
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  • 2024/2025
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Straighterline Chemistry Final
Questions and Correct Answers the
Latest Update and Recommended
Version
findings that are summarized based on a pattern or trend

✓ Law


tentative explanation for a set of observations

✓ Hypothesis


If a liquid contains 60% sugar and 40% water throughout its composition then what is it

called?

✓ Homogeneous mixture


does not have a uniform composition throughout

✓ Heterogeneous mixture


represents a physical change?

✓ Water, when heated, forms steam.


How many micrograms are in 65.3 kg?

✓ e. 6.53 × 1010 μg




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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)

✓ 58 cm3


Given that 1 inch = 2.54 cm, 1.00 cm3 is equal to

✓ 0.0610 in3


What terms defines a mass which is exactly equal to 1/12 the mass of one carbon-12 atom?

✓ Atomic mass unit


How many neutrons are there in an atom of lead whose mass number is 208?

✓ 126


Which of these elements is chemically similar to magnesium?

✓ Calcium


C(graphite) and C(diamond) are examples of:

✓ allotropes of carbon.


The 80Br- ion has

✓ 35 protons, 45 neutrons, 46 electrons.


The formula for sodium sulfide is

✓ Na2S


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Which one of the following formulas of ionic compounds is the least likely to be correct?

✓ Ca2NO3


What is the name of ClO - ion?

✓ hypochlorite


Which of the following is a molecular formula for a compound with an empirical formula of

CH?

✓ C6H6


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)

✓ 1.71 × 105 J


Which is the correct electron configuration for gold?

✓ [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)

✓ 6.17 × 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.



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✓ 6.1 × 10-33 m


A(n) _________ is a point at which a standing wave has zero amplitude.

✓ 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)

✓ 1.0 × 10-13 m


The Pauli exclusion principle states that no ____ electrons within an atom can have the same

____ quantum numbers.

✓ 2; 4


Emission spectra

✓ can be used to identify unknown atoms.


Which one of the following equations correctly represents the process relating to the ionization

energy of X?

✓ X(g) → X+(g) + e-


How does atomic radius change as you move across the periodic table?

✓ Atomic radius decreases moving from left to right across a period and increases from top
to bottom.




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