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Atoms, Ions, Molecules, and Water Properties in General Biology

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  • What is an atom?

    An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

  • Define an ion.

    An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net electrical charge.

  • What is a molecule?

    A molecule is two or more atoms chemically bonded together, representing the smallest unit of a compound.

  • Function of atoms in biology

    Atoms form the basic building blocks of all biological molecules and structures, enabling life processes.

  • Function of ions in biological systems

    Ions regulate electrical charges, help transmit nerve impulses, and maintain cellular homeostasis.

  • Function of molecules in biology

    Molecules form the structure of cells and perform biochemical functions essential for life.

  • What are the key properties of water?

    Water has cohesion, adhesion, high specific heat, solvent ability, and density changes on freezing.

  • Explain cohesion in water.

    Cohesion is the attraction between water molecules due to hydrogen bonding, causing surface tension.

  • Explain adhesion in water.

    Adhesion is the attraction between water molecules and other substances, aiding in capillary action.

  • Why is water a good solvent?

    Water is a polar molecule that dissolves many substances by surrounding and separating ions or molecules.

  • What is high specific heat of water?

    Water requires a lot of energy to change temperature, helping organisms maintain stable internal conditions.

  • How does water's density change on freezing?

    Water expands and becomes less dense when it freezes, allowing ice to float and insulate aquatic life.

  • Role of hydrogen bonds in water properties

    Hydrogen bonds between water molecules cause cohesion, adhesion, and high specific heat.

  • Describe the structure of a water molecule.

    A water molecule has two hydrogen atoms covalently bonded to one oxygen atom, forming a polar molecule.

  • How do ions form from atoms?

    Atoms form ions by losing or gaining electrons to achieve a stable electron configuration.

  • Difference between cations and anions

    Cations are positively charged ions; anions are negatively charged ions.

  • Why are molecules important in biology?

    Molecules make up cells and tissues and participate in metabolic reactions essential for life.

  • What causes water's polarity?

    Unequal sharing of electrons between oxygen and hydrogen atoms causes water's polar nature.

  • How does adhesion help plants?

    Adhesion helps water climb plant roots and stems through capillary action.

  • Explain the importance of water's high specific heat in ecosystems.

    Water's high specific heat stabilizes temperatures in aquatic environments, protecting organisms from rapid changes.