11749368
Descripción
Test por Christina Marshall, actualizado hace más de 1 año
|
Creado por Christina Marshall
hace casi 7 años
|
|
Pregunta 1
Pregunta
___________________________________ make(s) up the nucleus of an atom.
Respuesta
-
Protons and electrons
-
Protons and neutrons
-
DNA and RNA
-
Neutrons and electrons
-
DNA only
Pregunta 2
Pregunta
Living organisms are composed mainly of which atoms?
Respuesta
-
calcium, hydrogen, nitrogen, and oxygen
-
carbon, hydrogen, nitrogen, and oxygen
-
hydrogen, nitrogen, oxygen, and helium
-
carbon, helium, nitrogen, and oxygen
-
carbon, calcium, hydrogen, and oxygen
Pregunta 3
Pregunta
The ability of an atom to attract electrons in a bond with another atom is termed its
Respuesta
-
hydrophobicity
-
electronegativity
-
solubility
-
valence
-
both a and b
Pregunta 4
Pregunta
Hydrogen bonds differ from covalent bonds in that
Respuesta
-
covalent bonds can form between any type of atom, and hydrogen bonds form only between H and O.
-
covalent bonds involve sharing of electrons, and hydrogen bonds involve the complete transfer of electrons
-
covalent bonds result from equal sharing of electrons, but hydrogen bonds involve unequal sharing of electrons.
-
covalent bonds involve sharing of electrons between atoms, but hydrogen bonds are the result of weak attractions between a hydrogen atom of a polar molecule and an electronegative atom of another polar molecule.
-
covalent bonds are weak bonds that break easily, but hydrogen ions are strong links between atoms that are not easily broken.
Pregunta 5
Pregunta
A free radical
Respuesta
-
is a positively charged ion.
-
is an atom with one unpaired electron in its outer shell.
-
is a stable atom that is not bonded to another atom
-
can cause considerable cellular damage
-
both b and d.
Pregunta 6
Pregunta
Chemical reactions in living organisms
Respuesta
-
require energy to begin
-
usually require a catalyst to speed up the process
-
are usually reversible
-
occur in liquid environments, such as water.
-
all of the above
Pregunta 7
Pregunta
Solutes that easily dissolve in water are said to be
Respuesta
-
hydrophobic
-
hydrophilic
-
polar molecules
-
all of the above
-
b and c only
Pregunta 8
Pregunta
The molecular mass of glucose is about 180 g/mol. If 45g of glucose is dissolved into a final volume of 0.5L of water, what is the molarity of the solution?
Respuesta
-
0.125M
-
0.25M
-
0.5M
-
1.0M
-
2.0M
Pregunta 9
Pregunta
The sum of the atomic masses of all the atoms of a molecule is its
Respuesta
-
atomic weight
-
molarity
-
molecular mass
-
concentration
-
polarity
Pregunta 10
Pregunta
Reactions in which water is used to break apart other molecules are known as ___________________ reactions.
Respuesta
-
hydrophilic
-
hydrophobic
-
dehydration
-
anabolic
-
hydrolysis
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.