Chemistry (Test 3) ORU
How many chloride ions are needed to balance the positive charge of a barium ion (Ba2+)?
2
Which of the following is a positive ion? A. Na+ B. Ca2+ C. Mg2+ D. Al3+ E. All of the above
All of the above
Which of the following elements will most likely not form an ion at all? A. Na B. O C. Ar D. Mg E. Br
Ar
Which of the following bonds would be the least polar? A. C-F B. C-O C. C-Cl D. C-H E. all are equally polar
C-H
Which of the following is a covalent compound composed of nonpolar covalent bonds? A. H2 B. H2O C. CH4 D. NaF
CH4
How do the electron dot structures of elements in the same group in the periodic table compare with one another?
Elements of the same group have the same number of valence electrons
Which of the following molecules contains a polar covalent bond? A. H-F B. Cl-Cl C. H-H D. F-F E. All of the above
H-F
Which of the following molecules would contain a dipole? A. H-F B. Cl-Cl C.H-H D.F-F E. All of the above
H-F
Which of the following compounds has polar covalent bonds? A. H2O B. CsF2 C. S8 D. Ne E. CH4
H2O
Form an ion with a +2 charge
Mg
Why is metal shiny?
The loose electrons reflect most wavelengths of light
Describes a relatively polar covalent bond
a very electronegative atom and a weakly electronegative atom are covalently bound
What is the name for the following polyatomic ion? CH3CO2- A. acetate B. monocarboxylate C. carboxylic D acidic E. acetic
acetate
The farther apart two elements are located from each other in the periodic table, the
greater the polarity of the bond between them
Which of the following is an ion? A. 2H2 B. Br2 C. HCI D. Au + 3Br2 E. none of the above
none of the above
Best describes ionic bonding
one atom giving up some of its electrons to another atom
What is the name for the following polyatomic ion PO43- A. phosphate B. phosphorus oxide C. phosphinate D. trioxio phosphoride E. potassium
phosphate
The neon atoms tends not to gain any additional electrons because
there is no room available in its outermost occupied shell
Why is it so easy for a magnesium atom to lose two electrons?
these 2 electrons are well shielded from the nuclear charge.