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22 Cards in this Set
- Front
- Back
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T or F: Water molecules are neutral
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true
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What results from the oxygen atom being at one of a water molecule and the hydrogen atoms being at the other end?
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polarity
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Why is a water molecule polar?
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There's an uneven distribution of electrons between the oxygen and hydrogen atoms
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What is true about hydrogen bonds?
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The attraction between the hydrogen atom on one water molecule and the oxygen atom on another water molecule is an example
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is hydrogen bond stronger or weaker than ionic bonds? than covalent bonds? Are they the weakest bonds?
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weaker, weaker, no, they're the strongest bonds that form between molecules
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What is cohesion?
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attraction between molecules of the same substance
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What is adhesion?
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Attraction between molecules of different substances
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Why is water extremely cohesive?
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because of hydreogen bonding
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The rise of water in a narrow tube against the force of gravity is called...
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capillary action
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Why is the surface of the water in a graduated cylinder dips slightly in the center?
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adhesion between the water molecules and the glass molecules are stronger than the cohesion between the water molecules
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What is a mixture?
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Material composed of two or more elements or compounds that are physically, not chemically mixed together
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What is a suspension?
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Mixture of water and nondissolved material
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What is a solution?
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A mixture of two or more substances with molecules that are evenly distributed throughout
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Two water molecules can react to form ___
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ions
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what does the pH scale indicate?
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the concentration of H+ ions in solution
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What are buffers?
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Weak acid or bases that can react with strong acids or bases to prevent sharp, sudden changes in pH
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What gives carbon the ability to form chains that are almost unlimited in length?
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It can bond with other carbon atoms
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Many of the molecules in living cells are so large that they are known as ...
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macromolecules
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how are macromolecules formed?
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polymerization
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when monomers join together, what do they form?
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polymers
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what are polysaccharides?
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large macromolecules formed from monosaccharides
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the binding together of an enzyme and a substrate forms a(an) ....
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enzyme-substrate complex
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