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.