APBIO Unit 1: Exam Review to Retake

Which of the following is INCORRECT regarding WATER?

• Water is made of 2 Hydrogen Atoms and 1 Oxygen Atom.

• Water is Polar.

• Atoms within a single water molecule are held together by Hydrogen Bonds.

• Water Molecules form Hydrogen Bonds between each other due to attractions.

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Why do Hydrogen Bonds form between Water Molecules?

• Oxygen Atoms have a more Positive Charge because they are larger, and have a stronger pull on electrons. Positively Charged O Atoms between Water Molecules are attracted to each other.

• Hydrogen Atoms have a more Positive Charge because they are smaller, and have a weaker pull on electrons. Positively Charged H Atoms between Water Molecules are attracted to each other.

• Positively Charged Hydrogen Atoms and Negatively Charged Oxygen Atoms between different water molecules are attracted to each other.

• Negatively Charged Hydrogen Atoms and Positively Charged Oxygen Atoms between different water molecules are attracted to each other.

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Why do Hydrogen Atoms have a Positive Charge in Water Molecules?

• Hydrogen Atoms have a stronger pull on electrons. Gaining Electrons = Positive Charge.

• Hydrogen Atoms have a weaker pull on electrons. Losing Electrons = Positive Charge.

• Hydrogen Atoms have a weaker pull on electrons.

  Losing Electrons = Less Electronegative = More Positive.

• Hydrogen Atoms are smaller. Having a smaller mass is more positive.

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Why do Oxygen Atoms have a more Negative Charge in Water Molecules?

• Oxygen Atoms have a stronger pull on electrons. Gaining Electrons = Negative Charge.

• Oxygen Atoms have a weaker pull on electrons. Losing Electrons = Negative Charge.

• Oxygen Atoms are larger. Having a larger mass = Negative.

• Oxygen Atoms lose electrons to Hydrogen Atoms. Losing = Negative.

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A molecule is _______ when one end is more negatively charged, and the opposite end is more positively charged.

_______ Bonds hold different water molecules to one another.

_________________ Bonds hold the atoms within water molecules together.

_________ refers to the tendency of water molecules to attract other water molecules, due to polarity.

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________ refers to the tendency of water molecules to attract other polar surfaces / substances.

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An _______ is the smallest, most basic unit of matter.

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