Chapter 15
Which of the following substances contains F⁻ ions?
CaF₂
Which of the following elements will most likely form an ion with a -1 charge?
Cl
Which are closer together: the two nuclei within potassium floride (KF) or the two nuclei within molecular fluorine (F₂)?
F₂
Which of the following molecules contains a polar bond?
H-F
Which of the following is a covalent compound compsed of nonpolar covalent bonds?
H₂
valence shell
It is the outermost shell of electrons in an atom
How many electrons are used to draw the electron-dot structure for acetylene, a covalent compound with the formula, C₂H₂?
10
If an element has a -1 negative charge and the following chemical symbol, how many electrons does it have? ¹⁹₉F
10
How many chloride ions (Cl⁻¹) are needed to balance the positive charge of a barium ion (Ba⁺²)?
2
Which of the following would have the lowest melting point?
CF₄
Which of the following molecules is most likely to show a hydrogen bonding interaction?
CH₃OH
What property of metal atoms account for many of the observed bulk phenomena seen in metal samples?
Metal atoms easily lose one or more outer electrons
Which of the following molecules contains an ionic bond?
MgCl₂
Which of the following elements will most likely form an ion with a +1 charge?
Na
Which of the following is the strongest form of ineratomic attraction?
a chemical bond
What is the name for the following polyatomic ion? CH₃CO₂⁻¹
acetate
Which of the following is a positive ion?
all of the above (Na⁺³,Na⁺¹,Na⁺,Na⁺²)
Which of the following would be an ion with a double positive charge?
an Mg atom that loses two electrons
Which of the following descrives the reason for the following application of metals? structural supports for buildings
are strong but can be bent
Which of the following molecules is polar?
c
The separation of charges within a polat molecule is called an
dipole
Which of the following is the main form of intermolecular attraction in a water molecule?
hydrogen bonding
What drives an atom to form a covalent bond: its nuclear charge or the need to have a filled outer shell?
its nuclear charge
What it the main difference between an ion and covalent bond?
one is the sharing of a pair of electrons, the other is the transfer of at least one electron
What property of alloys make them ideal for developing new materials?
the chatacteristics of the material change depending on how much of each component is present
The neon atom tends NOT to gain any additional electrons because
there is no more room available in its outermost occupied shell
What is one role of unpaired valance electrons?
they take part in the formation of different types of bonds
If the following generic atom were to undergo ionization, what would be the most likely product be?
would probably not ionize
How many covalent bonds would the following generic atom usually form?
would usually not form any covalent bonds
If a neutral atom loses one electron, what is the electrical charge of the atom?
+1
If the following generic atom were to undergo ionization, what would be the charge of the most likely product?
+2
If a neutral atom gains two electrons, what is the electrical charge of the atom?
-2
How many more electrons can fit within the valance shell of a hydrogen atom?
1
If the concentration of gold in seawater is 2.0 milligram per ton of sea water and the mass of the ocean is 1.5×10¹⁸ tons, how much gold is in the ocean?
3.0×10¹²kg
If you mix a typical aluminum ion (Al, atomic#13) with a typical oxygen ion (O, atomic#8) what compound is formed?
Al₂O₃
Barium ions carry a 2+ charge and nitrogen ions carry a 3- charge. What would be the chemical formula for the ionic compound barium nitride?
Ba₃N₂
Which of the following bonds would be the least polar?
C-H
Take money away from your band and the bank will show a negative credit. Take an electron away from an aton and the atom shows up positive. Explain
Neutral atoms contain identically charged but oppositely signed protons and electrons. Removing one of the negative electrons results in an excess of positively charged protons.
Which bond is most polar?
O-H
Phosphine is a covalent compound of phosphorus (P) and hydrogen (H) what is its chemical formula?
PH₃