CHEM TEST

The atomic number of an element indicates the number of
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The atomic number of an element indicates the number of
protons
The -ide suffix is used when
a nonmetal is in a compound with other elements
methane and paraffins are
non-polar covalent bonds
Is water non-polar or polar?
polar
In the "jar, screens, and water" experiment, explain what using the screens demonstrated
the screens demonstrated water's tremendous "surface tension". The cohesion at the water's surface due to hydrogen bonding was demonstrated to be stronger than the force of gravity.
What does detergent do water's surface tension? (recall the pepper experiment). Why does detergent affect water's surface tension?
Detergent is a large molecule composed of a polar head and a non-polar tail. Detergent interferes with water's tremendous surface tension. It disturbed the surface tension and caused the pepper to fall.
What does the word cohesion mean?
Cohesion means that a substance adheres to itself, such as water which is hydrogen bonded to itself
what 3d shape has the least surface area?
a sphere
What type of bond forms when atoms lose or gain electrons?
ionic
What is the weakest form of attraction between molecules?
van der waals forces
Water molecules are highly attracted to each other due to what bond form?hydrogen bondingThe alpha helix is formed by what bond form?hydrogen bondingWhich bond form is best described as positive nuclei in a sea of electrons?metallic bondsWhat type of bond occurs between two atoms that both want to lose electrons?a metallic bondcovalently bonded items are calledmoleculesTrue or false: covalent bonds are present even in ionic compoundstrueWhat is the name for the twisted ladder shape of dna?alpha helixA molecule with 2 oppositely, partially charged endsdipole moleculenon-polar substances generally dissolve well innon polar substancesany atom that has lost or gained electrons is aniontrue or false: metals generally want to gain electronsfalse: metals generally want to lose electronsmost atoms want to have _______ electrons in their outer shell8Occur when a hydrogen atom that is part of a polar molecule is attracted to a partially charged negative pole of another molecule.hydrogen bondsMakes water strongly attracted to itself, gives dna and proteins their three dimensional shapeshydrogen bondsthe attraction of "free floating" valence electrons to their positively charged metal nucleimetallic bondsmakes metals good conductors of electricity, allows metals to be malleable and ductilemetallic bondingBinds oppositely charged ionsionic bondsthis type of bonding occurs when atoms share electrons with other atomscovalent bondsList the bond forms in order from strongest to weakestCovalent, Ionic (Covalent and ionic are interchangeable), Metallic, Hydrogen, Van der WaalsThis type of bond occurs between two, different, polar molecules not containing hydrogenvan der waals forces