Indicate whether the sentence or statement is true or false. If false, change the identified word or phrase to make the sentence or statement true.

Indicate whether the sentence or statement is true or false. If false, change the identified word or phrase to make the sentence or statement true.

____ 1. Transition metals are monovalent because they attempt to get more stable electron configurations like half-filled and empty orbitals. ____________________

____ 2. Absorption spectra are the result of energy that has been absorbed by electrons. ____________________

____ 3. Electrons are most likely found near the nucleus, regardless of the type of orbital they ‘occupy’. ____________________

____ 4. The Pauli exclusion principle requires that two electrons in the same orbital have the same spin. ____________________

____ 5. All of the valence electrons in Fe2+ must have the same spin. _________________________

____ 6. A laser produces monochromatic light. _________________________

____ 7. Carbon tetrafluoride, CF4, contains four polar bonds and is a polar molecule. _________________________

____ 8. Diamond does not conduct electricity because it contains delocalized electrons. ______________________________

____ 9. Water is adhesive because it is bi-polar. _________________________

____ 10. A dipole occurs when two atoms with similar electronegativities bond to each other. _________________________

____ 11. Energy transformations are the basis for all the activities that make up our lives. ____________________

____ 12. Thermal energy is a form of potential energy that can be released to the surroundings. ____________________

____ 13. A negative enthalpy change is a measure of the amount of energy absorbed from the surroundings. ____________________

____ 14. Inside a calorimeter, the amount of energy gained by the surroundings (the water) must equal the amount of energy released by the reaction in the calorimeter. _____________________

____ 15. The enthalpy change per mole of a substance undergoing a change is called the molar enthalpy. ____________________

____ 16. Enthalpy changes for an exothermic reaction are given a negative sign. ____________________

____ 17. Enthalpy changes for an endothermic reaction are given a negative sign. ____________________

____ 18. If a chemical equation is reversed, according to Hess’s Law, no change occurs to the ?H of the reaction. ____________________

____ 19. To date there have been no major nuclear accidents in Canada. ____________________

____ 20. Half-life is the time required for one half of the sample to react. _________________________

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.

____ 21. The arrangement of electrons around the nucleus of an atom is known as
a. the Bohr model d. the diagonal rule
b. the ground state e. the electron configuration
c. the principal quantum number
____ 22. The 3p atomic orbital has the shape of
a. a sphere d. two perpendicular dumb-bells
b. a torus e. an egg
c. a dumb-bell
____ 23. Which of the following elements would have the lowest first ionization energy?
a. sodium d. chlorine
b. aluminum e. argon
c. nitrogen
____ 24. Unlike Bohr’s model of the atom, the quantum mechanical model of the atom treats the electron like
a. a tiny particle d. a wave
b. a proton e. a photon
c. a positive particle
____ 25. Why is phosphorus able to have a valence of 5+?
a. it is in group 5
b. it has five valence electrons
c. its most easily removed electron is in a p orbital
d. it has empty d orbitals
e. none of the above
____ 26. Why do non-metals have high electronegativities?
a. they are very small atoms and thus have a stronger hold on their electrons
b. they are on the left side of the periodic table
c. they contain many protons therefore they have a stronger hold on their electrons
d. they can easily become iso-electronic with noble gases by accepting electrons
e. none of the above
____ 27. Which element is the most electronegative?
a. helium d. hydrogen
b. fluorine e. sodium

Explanation & Answer

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