Quiz 1 Unit 1 Review

Quiz 1 Unit 1 Review

Multiple Choice

What led Dalton to develop the modern atomic theory?

• Finding that thing always combined in fixed ratios [e.g., 1 part sodium and 1 part chlorine for salt (NaCl)]

• The gold foil experiment where most positive alpha particles passed through, but only a few were deflected.

• The hydrogen emission spectrum has only 4 lines

Multiple Choice

What led Thomson to develop his "Plum Pudding" Model?

• Chemicals combine in fixed proportions (e.g., 1 part sodium with 1 part chloride to make salt)

• Cathode Rays were deflected by a negative plate and attracted to a positive plate.

• Positive alpha particles passed through thin Gold Foil most of the time, but were deflected once in a while.

Multiple Choice

What led Rutherford to develop the Planetary Model?

• The double-slit experiment showed that all matter is both particles and waves.

• Positive alpha particles passed through thin Gold Foil most of the time, but were deflected once in a while.

• The hydrogen emission spectrum has 4 discrete lines.

Multiple Choice

What led Bohr to modify the Planetary model?

• The double-slit experiment showed that all matter is both particles and waves.

• The gold foil experiment where most positive alpha particles passed through, but only a few were deflected.

• The hydrogen emission spectrum has only 4 lines.

Multiple Choice

What led Schrödinger to develop the Quantum Mechanical Model?

• The idea that if you divide something enough times, you will eventually arrive a fundamental building block

• 1) The hydrogen emission spectrum splits into more lines when passed through a magnetic field, 2) Matter is particles AND waves, 3) Complicated math

• Cathode rays are deflected away from a negative plate and toward a positive plate.

Multiple Choice

Which of the following is FALSE?

• Light emission occurs when electrons move from excited state orbitals away from the nucleus toward ground state orbitals close to the nucleus.

• Discrete lines in an element's spectrum are due to electrons moving from one orbital to another during emission.

• The Gold Foil Experiment showed that elements have discrete energy levels.

Multiple Choice

What are flame tests and emission spectroscopy useful for?

• Telling the identity of the element based on its signature color or emission "fingerprint."

• Confirming the atomic theory.

• Finding the atomic masses of the isotopes.

Multiple Choice

Which of the following is FALSE?

• Protons have a charge of +1, neutrons have a charge of 0, and electrons have a charge of -1.

• Protons and Electrons have an atomic mass of approximately 1 amu. Neutrons have an atomic mass of 1/1800 amu.

• The mass of the atom comes from the nucleus (which contains the protons and neutrons), while the volume comes from the electron cloud.

• The identity of the atom (which element it is) is determined by the number of protons it has.

Multiple Choice

Which of the following is FALSE regarding Carbon-13 (Note: It has 6 protons)?

• Its mass number is 13

• It's atomic number is 6

• It has 7 neutrons

• Its symbol is

  $_{13}^6C$

Multiple Choice

Element Q has three isotopes with the following relative abundances:

Isotope 1: 5.005 amu, 90%

Isotope 2 : 6.25 amu, 6%

Isotope 3: 7.01 amu, 4%

What is the approximate average atomic mass?

• 5.16 amu

• 6.09 amu

• 515.99 amu