Final Exam Practice (Units 1 & 2)

Which of the following is/are true?

• According to Dalton’s Atomic Theory, two atoms of nickel could have different masses

• According to Dalton’s Atomic Theory, a chemical reaction cannot change an atom of zinc into an atom of copper

• Robert Millikan’s oil drop experiment determined the charge-to-mass ratio of an electron

• Rutherford's gold foil experiment showed that atoms must have a very dense nucleus which contains most of the mass, but occupies little of the volume of the atom, most of the atom is empty space 

Which of the following is/are true?

• If two identical waves are in phase when they interact, the result is destructive interference

• As the energy of a photon decreases, the frequency decreases and wavelength increase

• Green light has a longer wavelength than microwaves

• Diffraction demonstrates the wave of nature of light

Tags

NGSS.HS-PS4-1

Which of the following is/are true?

• According to Hund's rule, no two electrons in an atom can have the same four quantum numbers

• In a multi-electron atom, all orbitals within a given subshell are degenerate

• The ground-state electron configuration for Sn is [Kr] 5s^24d^105p^2

• For the ground-state orbital diagram of Se, there are 4 unpaired electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is/are true?

• CaCl2 dissolved in water is considered a homogenous mixture

• Dimethyl ether, CH3OCH3, is considered a pure substance, molecule, and a compound

• Chlorine gas, Cl2, is considered a pure substance, molecule, and compound

• Sweet tea with ice cubes is considered a homogenous mixture

Which of the following is/are true?

• A valence electron in its ground state in In (Indium) could have the quantum numbers n=4, l=2, ml=1, ms= 1/2

• F has 7 valence electrons, 1 of which is unpaired

• Ca and Cd have the same number of valence electrons

• Co has 2 valence electrons and 25 core electrons

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following is/are true?

• A theory is a tentative explanation of observations; a law is model for the way nature works

• A law describes why or how something happens; a theory describes what happens in nature

• A law is a brief statement that summarizes past observations and predicts future ones

• When iron rusts in a closed container, the mass of the container and its contents do not change” is an example of an observation

Which of the following classification is true for Br?

• Alkali metal

• Main-group metal

• Nonmetal

• Halogen

Which of the following is/are true?

• The law of multiple proportions applies when comparing two samples of CH2O obtained from different sources

• The law of definite proportions applies when comparing a sample of CH20 to a sample of C2H4O

• According to the law of conservation of mass, if 7.7 grams sodium reacts completely with 11.9 grams chlorine gas to produce sodium chloride, then 19.6 grams sodium chloride should be produced

• According to the law of definite proportions, all samples of a given compound, regardless of their source or how they were produced, have the same proportions of their constituent elements 

Tags

NGSS.HS-PS1-7

Which of the following is/are true?

• According to the Bohr model of the atom, electrons orbit the nucleus at a particular distance, which corresponds to the energy of the electron

• The energy of an electron in an atom is quantized, which means only certain values of energy are possible for an electron in an atom

• In the Bohr model of the atom, when an electron absorbs energy it jumps to a lower energy level; when it jumps back to a higher energy level, it emits a photon with an energy equal to the difference

• As the energy of a photon decreases, the wavelength decreases and the frequency increases

Tags

NGSS.HS-PS4-1

NGSS.HS-PS4-3

Which of the following is/are true?

• N=5, l=0, ml= -1, ms=1/2, is a valid set of quantum numbers

• An electron with the quantum numbers n=3, l=2, ml=1, ms=1/2, and an electron with the quantum numbers n=3, l=1, ml=1, ms=-1/2atre in the same subshell

• There are exactly 5 orbitals in an atom that can have the quantum numbers n=4, l=2

• The principal quantum number corresponds to the size and energy of an orbital; the angular momentum quantum number corresponds to the shape of the orbital