Ans Doc149Y

CLICK HERE TO DOWNLOAD THIS ANSWER INSTANTLY

1. Which element’s atomic radius changes the most in size when it becomes ionized?
A. Lithium
B. Chlorine
C. Fluorine
D. Sodium

2. Which of the following are not grouped according to similar chemical properties?
A. Cobalt, iron, nickel
B. Gold, silver, copper
C. Iron, copper, ruthenium
D. Ruthenium, iridium, palladium

3. What is the electronegativity difference for a bond between potassium and iodine?
A. 4.6
B. 1.7
C. 3.3
D. 0.4

4. Due to shape and polarity differences, the boiling point of carbon dioxide dioxide is _______ water.
A. lower than
B. equal to
C. much higher than
D. slightly higher than

5. _______ with the largest atoms and the smallest number of valence electrons and _______ with the
smallest atoms and the greatest number of valence electrons are the most reactive.
A. Nonmetals; metals
B. Transition elements; metals
C. Metals; nonmetals
D. Nonmetals; transition elements

7. Which of the following is true regarding the inner transition elements?
A. They occupy the d block of the periodic table.
B. These include all elements in groups 3–12.
C. These include the lanthanides and actinides and do not have f sublevels.
D. Their valence electrons can be located in both s and f sublevels.

8. When an atom of iron loses all of its 4s electrons and one of its 3d electrons, what is its charge?
A. 5+
B. 3+
C. 7+
D. 52

9. When chromium loses two electrons, its configuration changes to
A. [Ar]4s13d5.
B. [Ar]4s13d4.
C. [Ar]3d4.
D. [Ar]4s1.

10. Which of the following elements would exhibit the greatest shielding effect?
A. Sodium
B. Potassium
C. Lithium
D. Rubidium

11. The number of energy levels to which an electron can jump depends on the
A. amount of energy it absorbs.
B. color of light only.
C. wavelength of light only.
D. electromagnetic spectrum.

12. Ethyne differs from ethene in what way?
A. Ethyne contains only carbon and hydrogen atoms.
B. The carbons in ethyne are not fixed in place as they are in ethene.
C. The carbons share three pairs of electrons in ethyne and only two pairs in ethene.
D. The carbons in ethyne each form three single bonds whereas those in ethene each form four single bonds.

13. What statement does not accurately describe the following equation?
A. Oxygen is a reactant.
B. This reaction is endothermic.
C. This reaction releases energy.
D. Eighteen atoms of oxygen are found as both part of the reactants and the products.

14. Which of the following is true?
A. Cesium is the most active group 1 metal, because its valence electron is held more tightly than the others in the same group.
B. Group 1 elements are more reactive than the group 2 elements because they have more valence electrons to lose.
C. Lithium is the least reactive element in group 1, because it is the smallest and holds its valence electron more tightly than the others in the same group.
D. The least reactive element in group 2 is the one with the largest atomic radium and the least amount of attraction between the nucleus and the valence electrons.

15. Which of the following is not true of polar covalent bonds?
A. Polar covalent bonds create two poles across the bond.
B. Polar covalent bonds result from the unequal sharing of electrons.
C. Electronegativity differences for atoms with polar covalent bonds range between 0.5 and 2.0.
D. Polar covalent bonds exist between atoms of the same element.

16. Which of the following scenarios would drive the reaction below to the left?
A. Removing C
B. Adding D
C. Adding B
D. Adding more energy

17. Covalent bonding (with an electronegativity difference below 0.5) results when fluorine bonds with
A. hydrogen.
B. potassium.
C. iodine.
D. fluorine.
18. Which element has the electron configuration 1s22s22p63s23p3?

A. Phosphorus B. Arsenic
C. Krypton
D. Scandium

19. All the following are signs of a chemical reaction, except
A. a release of gas.
B. a change in color or odor.
C. a change of state.
D. a change in energy.

20. Which of the following would not increase the rate of most reactions?
A. Adding a catalyst
B. Increasing the temperature
C. Lowering the concentration of the reactants
D. Removing an inhibitor
Chemistry exam