Question 1(Multiple Choice Worth 1 points)

[02.01]In the 1800s, John Dalton's atomic theory was that atoms are indivisible. Later, subatomic particles such as neutrons, electrons, and protons were discovered. What happened to the indivisible part of Dalton's atomic theory, and why?

 The theory remained unchanged because Dalton was correct regarding all other statements within the accepted scientific theory.

 Dalton's theory remained intact, and the new evidence was ultimately discarded because new data must fit within the current accepted theory.

 The indivisible part of the theory was voted upon by the scientific community because validity is based on the majority of scientific opinions.

 The indivisible part of the theory was discarded after the subatomic particles discovery because consensus of data must exist for theories to be valid.

Question 2(Multiple Choice Worth 1 points)

[02.01]Why do scientists need scientific models?

 They can often be used to make predictions.

 Once established, they become fairly rigid and rarely change over time.

 They exactly present the scientific principle being demonstrated.

 They are typically based on mathematical explanations.

Question 3(Multiple Choice Worth 1 points)

[02.01]Thompson's Plum Pudding model allowed scientists studying the atom to do which of the following?

 analyze and test Thompson's findings.

 create an image that could be used in schools.

 increase interest and funding in atomic theory.

 disperse the information more quickly to the public.

Question 4(Multiple Choice Worth 1 points)

[02.01]Which is true about models in science?

 Models are accurate enough for the phenomena they represent.

 Models only present macroscopic versions of the submicroscopic.

 Models help explain phenomena but are not good for predicting events.

 Models are used throughout science although they are not always accurate.

Question 5(Multiple Choice Worth 1 points)

[02.01]Models have been created that predict world sea levels will rise if the current global temperature increases continue. If these models are correct, which of the following could be correctly inferred?

 The amount of land area will decrease.

 Fossil fuels will rapidly become depleted.

 Alternative energy sources will not meet demand.

 Deforestation continues to cause global warming.

Question 6(Multiple Choice Worth 1 points)

[02.01]Why are computer models useful in studying phenomena in the universe?

 Models can study phenomena that would be impossible to study any other way.

 Models can automatically change data if the data does not match observations.

 Models are more reliable and more trustworthy than studying natural phenomena.

 Models are more costly but consequently have more credibility and validity.

Question 7(Multiple Choice Worth 1 points)

[02.01]Which answer best explains why weather models will continue to improve?

 Weather events will continue to become more deadly.

 Funding for research will continue to be available.

 Society is dissatisfied with the current weather models.

 Scientists continue to find new information and better technology.

Question 8(Multiple Choice Worth 1 points)

[02.01]J.J. Thompson's experiments led to the discovery of negatively charged particles. What were the negatively charged particles that Thompson discovered?

 electrons

 ions

 neutrons

 protons

Question 9(Multiple Choice Worth 1 points)

[02.01]What caused the scientific community to accept Rutherford's atomic model?

 Other scientists repeated the experiment.

 Rutherford recreated Thompson's experiment.

 Thompson approved Rutherford's experiment.

 Scientists explained the complete experiment.

Question 10(Multiple Choice Worth 1 points)

[02.01]In Rutherford's experiment, which of the following characteristics of the nucleus caused the particles to be deflected by the foil?

 It was shown to contain neutrons.

 It consisted of mostly empty space.

 It was larger in width than the atom.

 It had more mass than the rest of the atom.

Question 11(Multiple Choice Worth 1 points)

[02.01]How are theories supported in the scientific community?

 They are treated as hypotheses.

 They are tested by many scientists.

 They are unproven but accepted as fact.

 They are rarely altered after publication.

Question 12(Multiple Choice Worth 1 points)

[02.01]Which of the following best explains why J.J. Thompson's Plum Pudding model had to be revised?

 Atoms must have neutrons.

 Atoms have protons and neutrons in the nucleus.

 Atoms must have electrons in the nucleus.

 Atoms have protons and electrons in energy levels.

Question 13(Multiple Choice Worth 1 points)

[02.02]Modern atomic theory states that atoms are neutral. How is this neutrality achieved in atoms?

 having more neutrons than protons or electrons

 having equal numbers of protons and electrons

 having fewer neutrons than protons or electrons

 having equal numbers of protons and neutrons

Question 14(Multiple Choice Worth 1 points)

[02.02]Which subatomic particles exist in orbital energy levels, or shells?

 electrons

 ions

 protons

 neutrons

Question 15(Multiple Choice Worth 1 points)

[02.02]Below is an element example of boron (B) from the periodic table. How many neutrons are found in each atom of boron? 

 

 

 5

 6

 11

 16

Question 16(Multiple Choice Worth 1 points)

[02.02]Lithium (Li) has an atomic number of 3, an atomic mass of approximately 6.941, and a mass number of 7. If a lithium atom is neutral, how many electrons will be present in each atom of lithium?

 3

 4

 7

 10

Question 17(Multiple Choice Worth 1 points)

[02.02]Below is an element example of gallium (Ga) from the periodic table. Which of the following indicates the mass number of gallium? 

 

 

 31

 39

 70

 101

Question 18(Multiple Choice Worth 1 points)

[02.03]What do all isotopes of the same element have in common?

 atomic mass

 chemical stability

 number of neutrons

 number of protons

Question 19(Multiple Choice Worth 1 points)

[02.03]The most common isotope of nitrogen is nitrogen-14, or 14N. Which of the following atoms has the same number of neutrons as 14N?

 13C

 16O

 15N

 14P

Question 20(Multiple Choice Worth 1 points)

[02.02, 02.03]Which of the following is the symbol for an atom with 23 protons and 28 neutrons?

  

  

  

 

Question 21(Multiple Choice Worth 1 points)

[02.03]Iridium has two naturally occurring isotopes. Iridium-191 has a mass of 190.96 and a relative abundance of 37.3%. Iridium-193 has a mass of 192.96 and a relative abundance of 62.7%. What is the weighted average atomic mass of iridium?

 191.71 g/mol

 191.96 g/mol

 192.00 g/mol

 192.21 g/mol

Question 22(Multiple Choice Worth 1 points)

[02.03]Gallium has a weighted average atomic mass of 69.7 and two naturally occurring isotopes: gallium-69 and gallium-71. Gallium-69 has a relative abundance of 60.1% and a mass of 68.9. The relative abundance of gallium-71 is 39.9%. Based on this information, what is the mass of gallium-71?

 71.1 g/mol

 71.0 g/mol

 70.9 g/mol

 70.8 g/mol

Question 23(Multiple Choice Worth 1 points)

[02.04]The molar mass of phosphorus is equal to the mass of 6.02 x 1023 atoms of phosphorus. What is the molar mass of phosphorus, in g/mol?

 5.14

 30.97

 45.97

 90.33

Question 24(Multiple Choice Worth 1 points)

[02.04]A platinum wedding band contains 0.077 mol of platinum. How many atoms of platinum are in the 15-gram platinum wedding band?

 3.09 x 1021 atoms

 4.64 x 1022 atoms

 7.82 x 1024 atoms

 1.17 x 1026 atoms

Question 25(Multiple Choice Worth 1 points)

[02.04]How many grams of bismuth are in a 1.2-mol sample of bismuth? 

 

 

 99.6 g

 174.2 g

 209.0 g

 250.8 g

Question 26(Multiple Choice Worth 1 points)

[02.04]A laboratory has a 2.0-mol sample of pure selenium and a 2.0-mol sample of pure chromium. How many more grams of selenium than chromium does this represent?

 65.5 g

 53.9 g

 27.0 g

 13.5 g

Question 27(Multiple Choice Worth 1 points)

[02.04]Neon has an average atomic mass of 20.2 g/mol, whereas argon has an average atomic mass of 40.0 g/mol. How would the number of atoms in a 1.0 mol sample of neon compare to the number of atoms in a 4.0 mol sample of argon?

 The argon sample would have the same number of atoms as the neon sample.

 The argon sample would have twice as many atoms as the neon sample.

 The argon sample would have four times as many atoms as the neon sample.

 The argon sample would have eight times as many atoms as the neon sample.

Question 28(Multiple Choice Worth 1 points)

[02.06]Which of the following elements is the most stable element?

 argon

 manganese

 phosphorus

 rubidium

Question 29(Multiple Choice Worth 1 points)

[02.06] How many electrons are located in the 2p sublevel in a ground-state nitrogen atom?

 3

 5

 6

 7

Question 30(Multiple Choice Worth 1 points)

[02.06]Silicon is in the third period on the periodic table. Which orbital levels do its electrons occupy?

 s only

 p and d

 p only

 s and p

Question 31(Multiple Choice Worth 1 points)

[02.06]What is released in the process of an atom decaying from an excited level to a lower energy level?

 a photon

 an electron

 an ion

 a proton

Question 32(Multiple Choice Worth 1 points)

[02.06]Which of the following best describes how an electron moves when it releases energy?

 The electron is pulled into the nucleus.

 The electron moves to a higher energy level.

 The electron moves to a lower energy level.

 The electron is pulled to another atom.

Question 33 (Essay Worth 1 points)

The skills you have demonstrated on this pretest may give you the option of being exempt from specific lessons within this module. If available, would you be interested in such an exemption?

SuperTutor

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Status NEW Posted 27 Apr 2017 12:04 AM My Price 20.00

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