Upgrade to remove ads
Chemistry 1 review questions?
Terms in this set (19)
what type of intermolecular forces does not rely on polar atoms to create a permanent dipole moment?
london dispersion forces
what type of atoms bonded together in large clusters contribute to the accumulation of london dispersion forces?
carbon and hydrogen
true or false: a molecule with an electronegative element like a halogen (F, Cl, Br, I) will be non-polar?
false: a non-polar molecule may have extremely electronegative elements like halogens as long as they are geometrically balanced.
true or false? The presence of only weak london dispersion forces guarantees low boiling and melting points?
false: london dispersion forces accumulate with large groups of carbon-hydrogen bonded atoms. this can make non-polar molecules have very high boiling points and very low melting points.
liquids at huge ranges of temperatures include soft wax fats, oils, and grease
what vibration phenomenon is responsible for london dispersion forces?
what family (group) are known for creating an uneven distribution of electrons of electrons in a bond with atoms from other groups?
halogens: the most electronegative across a period of the PT will attract more electrons across a bond
what atoms are required for a molecule to make hydrogen bonds?
nitrogen, oxygen, fluorine
is a hydrogen bond longer or shorter than a covalent single bond?
around 2-3 angstroms (0.2-0.3 nanometers) compared to 1 angstrom for a o-H covalent bond
true or false? a molecule must have a hydrogen covalently bonded to a very electronegative atom to form hydrogen bonds?
false: a compound can still accept H-bonds even in the absence of a hydrogen atom covalently bonded to to O, N, or F. it just can't make them
true or false? the presence of an extremely electronegative atom in a molecule does not guarantee that a molecule will be polar?
true: for small simple molecules, geometrically arrangement of several electronegative atoms may cancel out their polar effects resulting in a non-polar molecule. for larger molecules, large hydrocarbon clusters will override the effect of a few polar bonds
Why is ∆Hfus < ∆Hvap ?
During fusion(solidifying) liquid solid ∆H < 0During vaporization liquid gas ∆H > 0Also the magnitude │∆Hfus│ < │ ∆Hvap │,IMF are not completely broken at the solid-liquid phase boundary, but loosened. IMF must be completely overcome to cross the liquid-gas phase boundary
The change in enthalpy (heat) of a system containing milk and sugar turning into ice cream will be greater than, or less than zero?
Less than. ∆H < 0 . Energy needs to be removed from the liquid milk/sugar solution to become solid ice cream.
unique about ions?
must have negative or positive charge
True or False: In the polyatomic ion phosphate, PO43-, the phosphorous-oxygen bonds are about as easily broken as Hydrogen bonds in water?
False, the oxygen-phosphorous bond here is a intramolecular bond. They require much more energy to break than an intermolecular H-bond.
How many ions are contained in one formula unit of Na2SO4?
total - two Na+ions one SO42- ion
What do we call the energy that holds together ions of opposite but equal charges
What is the typical units used in chemistry for concentration and what fundamental units are they derived from?
Molarity mols / liter
100 grams of which noble gas will contain the least number of mols?
Og, whatever that is
True or False: Two particles in a system with a constant temperature but different having different masses may have the same speed.
True, temperature is related to the average speed of all particles. At a given temp, some particles move slower and some faster than average.
Other sets by this creator
Microbiology Lab Quiz 1
Microbiology Test 1
Organic Chemistry chapters 1 and 2
chemistry 2 Test 5
Other Quizlet sets
Ortho Lecture 2 - Wrist/Hand
COMD 4200 Quiz Chapter 7
Competency 005 - Geography and Culture i…
Chapter 5 & 6