Biology CHAPTER 3

A- The attraction of an atom for electrons in a covalent bond.
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Which of the following statements helps to explain why water molecules form hydrogen bonds?
A- The electrons spend more time around the hydrogen atoms because hydrogen is more electronegative than oxygen.
B- There is a partial negative charge on each hydrogen atom and two partial positive charges on the oxygen atom in a water molecule.
C- Attractions form between opposite partial charges.
Water is a polar molecule. What does this statement mean?
A-That the atoms in water have equal electronegativities
B-That water molecules are linear, like a pole
C-That water is one of the many hydrophobic molecules
D-That atoms in the molecule have partial charges as a result of unequal sharing of electrons in a covalent bond
0.239One joule equals how many calories?1cal/(g*C)Specific heat formula for water?solventdissolving agent of a solutionaqueous solutionsolute is dissolved into water; water is the solventCondensing 5g of steam to liquid water.what kind of action would involve the greatest transfer of heat?C- specific heat of that substanceThe amount of heat required to change the temperature of 1 g of any substance by 1°C is defined as ; a-1 kilocalorie b-1 calorie c-the specific heat of that substanceA- because it is polar, waters negatively charged oxygen atoms and positively charged hydrogen atoms are attracted positively and negatively charged ions and moleculesHow does the polarity of water contribute to its ability to dissolve so many substances? a-Because it is polar, water's negatively charged oxygen atoms and positively charged hydrogen atoms are attracted to positively and negatively charged ions and molecules. b-Because it is polar, water forms ionic bonds with the ions in substances such as NaCl (salt).A- 0.092gA mole of ethyl alcohol weighs 46 g. How many grams of ethyl alcohol are needed to produce 1 L of a 2-millimolar (2 mM) solution? A-0.092 g B-9.2 g C-0.92 g1- hydrogen atom leaves it's it's electrons behind transferred into hydrogen ion. 2- water molecule that lost the proton is now a hydroxide ion. 3- proton binds to other water molecule . 4- making that water molecule a hydronium ion.what happens when a hydrogen atom is participating in a hydrogen bond?basesubstance that reduces hydrogen ion is called?