A
A chemical bond that results from the sharing of valence electrons between atoms.
covalent bond
Sand is the oxide of what element?
silicon
Process used to synthesize ammonia.
Haber process.
What element is produced industrially by steam reforming of natural gas?
hydrogen
What is the maximum number of valence electrons an atom may have?
8
What is the most abundant element in the earth crust?
oxygen
A chemical bond that bind atoms together in a metal forming a sea of electrons.
metallic bond
the same element that differ in their properties but exist in the same physical state.
allotropes
Which is the tenth most abundant element in the earth crust?
phosphorus
What is the process in which nitric acid is produced commercially?
Ostwald process
What is the most reactive halogen?
fluorine
the addition of hydrogen to a double bond or triple bond.
hydrogenation
How many allotropes oxygen has? Which are they?
two, O2 and O3
The process occurring in plants that continually replenishes oxygen in the atmosphere is __.
photosynthesis
Which noble gas is the most common in the atmosphere?
argon
How many oxides oxygen has? Which are the names?
three; normal oxide, super oxide and peroxide
What type of bond results from the sharing of four electrons?
double bond
Molecules that have four bondings are said to have ____ geometry.
tetrahedral
Which intermolecular force is present only if hydrogen is bonded to oxygen, nitrogen or fluorine?
hydrogen bonds
Which molecular force is found only in polar molecules?
dipole-dipole forces
What is the primary use of hydrogen according to the Haber process?
producing ammonia
Molecules in which three atoms are arranged in a straight line are said to have ________ geometry.
linear
The process by which certain microorganisms convert atmospheric nitrogen to a form that can be used by plants is ___.
nitrogen fixation
Which intermolecular force is present in all molecules?
London forces
Which intermolecular force is the strongest? Which one is the weakest?
strong-hydrogen bond
weak-london