11749368
Descrição
Quiz por Christina Marshall, atualizado more than 1 year ago
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Criado por Christina Marshall
quase 7 anos atrás
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Questão 1
Questão
___________________________________ make(s) up the nucleus of an atom.
Responda
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Protons and electrons
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Protons and neutrons
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DNA and RNA
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Neutrons and electrons
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DNA only
Questão 2
Questão
Living organisms are composed mainly of which atoms?
Responda
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calcium, hydrogen, nitrogen, and oxygen
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carbon, hydrogen, nitrogen, and oxygen
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hydrogen, nitrogen, oxygen, and helium
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carbon, helium, nitrogen, and oxygen
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carbon, calcium, hydrogen, and oxygen
Questão 3
Questão
The ability of an atom to attract electrons in a bond with another atom is termed its
Responda
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hydrophobicity
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electronegativity
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solubility
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valence
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both a and b
Questão 4
Questão
Hydrogen bonds differ from covalent bonds in that
Responda
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covalent bonds can form between any type of atom, and hydrogen bonds form only between H and O.
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covalent bonds involve sharing of electrons, and hydrogen bonds involve the complete transfer of electrons
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covalent bonds result from equal sharing of electrons, but hydrogen bonds involve unequal sharing of electrons.
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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.
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covalent bonds are weak bonds that break easily, but hydrogen ions are strong links between atoms that are not easily broken.
Questão 5
Questão
A free radical
Responda
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is a positively charged ion.
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is an atom with one unpaired electron in its outer shell.
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is a stable atom that is not bonded to another atom
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can cause considerable cellular damage
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both b and d.
Questão 6
Questão
Chemical reactions in living organisms
Responda
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require energy to begin
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usually require a catalyst to speed up the process
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are usually reversible
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occur in liquid environments, such as water.
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all of the above
Questão 7
Questão
Solutes that easily dissolve in water are said to be
Responda
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hydrophobic
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hydrophilic
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polar molecules
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all of the above
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b and c only
Questão 8
Questão
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?
Responda
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0.125M
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0.25M
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0.5M
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1.0M
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2.0M
Questão 9
Questão
The sum of the atomic masses of all the atoms of a molecule is its
Responda
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atomic weight
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molarity
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molecular mass
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concentration
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polarity
Questão 10
Questão
Reactions in which water is used to break apart other molecules are known as ___________________ reactions.
Responda
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hydrophilic
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hydrophobic
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dehydration
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anabolic
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hydrolysis
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