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Chapter 2 Mastering Biology Questions and Answers Fully Solved
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Chapter 2 Mastering Biology
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Chapter 2 Mastering BiologyWhat is the atomic number of an atom that has 6 protons, 6 neutrons, and 6 electrons?
- answer6
Which of these refers to atoms with the same atomic number but different atomic
masses? - answerThese atoms are isotopes.
Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does
fluorine have? - answer10
An uncharged atom of boron has an atomic number of 5 and an atomic mass of 11.
How many protons does boron have? - answer5
The innermost electron shell of an atom can hold up to _____ electrons. - answer2
Which of these relationships is true of an uncharged atom? - answerThe number of
protons is equal to the number of electrons.
What determines the types of chemical reactions that an atom participates in? -
answerthe number of electrons in the outermost electron shell
A phrase that applies to covalent bonding and not other kinds of bonds is ... -
answerelectron-sharing
6 CO2 + 6 H2O → C6H12O6 + 6 O2
The equation shows a ______ --the breaking and forming of chemical bonds that leads
to a change in the composition of matter. - answerchemical reaction
6 CO2 + 6 H2O → C6H12O6 + 6 O2
In the equation, CO2 is a ______. - answerreactant
6 CO2 + 6 H2O → C6H12O6 + 6 O2
In the equation, C6H12O6 is a ______. - answerproduct
6 CO2 + 6 H2O → C6H12O6 + 6 O2
In O2, the type of bond that holds the two oxygen atoms together is a ______. -
answernonpolar covalent bond
, 6 CO2 + 6 H2O → C6H12O6 + 6 O2
In H2O, the type of bond that holds one of the hydrogen atoms to the oxygen atom is a
______. - answerpolar covalent bond
6 CO2 + 6 H2O → C6H12O6 + 6 O2
The number of oxygen atoms on the left side of the equation is ______ the number of
oxygen atoms on the right side. - answerequal to
Which of the following substances is a compound?
hydrogen gas
liquid nitrogen
sodium
sugar - answersugar
Which four elements are the primary components of important biological molecules,
such as proteins, carbohydrates, and lipids? - answernitrogen, carbon, hydrogen, and
oxygen
A nutrition facts label from a fortified cereal states that in a single serving of cereal there
is 8% of the percent daily value of the element phosphorous. The label also says that a
single serving of cereal plus one-half cup of skim milk has 20% of the percent daily
value of phosphorus. Which of the following statements is false? - answerA half-cup of
skim milk contains twice as much phosphorus as a serving of cereal.
True:
--Eating five servings of cereal and two and a half cups of skim milk will give you 100%
of the phosphorus that you need for one day.
--The amount of phosphorus in six servings of cereal is equal to the amount of
phosphorus in two cups of skim milk.
--A half-cup of skim milk contains 12% of the percent daily value of phosphorus.
Atoms with the same number of protons but with different electrical charges _____. -
answerare different ions
In salt, what is the nature of the bond between sodium and chlorine? - answerionic
An ionic bond involves _____. - answeran attraction between ions of opposite charge
A radioactive isotope is an isotope that - answerdecays.
Medicines are often administered in pill form. In many cases, the active ingredient of the
pill (the drug) is joined to another substance by ________. This forms a(n) ________,
which is stable in the dry environment of a pill bottle but dissociates under the wet
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