Science June exam

    Master this deck with 22 terms through effective study methods.

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    What defines a solid in the kinetic particle model?

    Particles are closely packed with high forces between them.

    How does a liquid differ from a solid?

    Liquids have a random arrangement of particles and no fixed shape.

    What happens to particles during melting?

    Particles gain energy and move apart, changing from solid to liquid.

    What is Brownian motion?

    Random movement of particles due to thermal energy.

    How does temperature affect gas pressure?

    Increased temperature leads to more collisions and higher pressure.

    What is diffusion?

    Movement of particles from high to low concentration.

    What characterizes alkanes?

    They contain only single bonds between carbon atoms.

    How do alkenes differ from alkanes?

    Alkenes have at least one carbon-carbon double bond.

    What is the general formula for alcohols?

    CnH2n+1OH.

    What occurs during complete combustion?

    Hydrocarbons react with excess oxygen to produce CO2 and water.

    What is the consequence of incomplete combustion?

    Produces carbon monoxide and soot due to limited oxygen.

    What is the role of enzymes in biological reactions?

    They act as catalysts to speed up reactions without being consumed.

    How does temperature affect enzyme activity?

    Increased temperature raises activity until denaturation occurs.

    What defines a covalent bond?

    A shared pair of electrons between two non-metal atoms.

    How do ionic compounds differ from covalent compounds?

    Ionic compounds conduct electricity when molten, covalent do not.

    What is the function of red blood cells?

    Transport oxygen using hemoglobin.

    What is the significance of the nucleus in a cell?

    It contains genetic material that controls cell activities.

    What happens during photosynthesis?

    Plants convert sunlight into chemical energy using chlorophyll.

    What is the purpose of a dichotomous key?

    To identify living organisms through a series of yes/no questions.

    What is the structure of DNA?

    A double helix made of nucleotides with complementary base pairing.

    What is the role of the active site in enzymes?

    It binds to substrates, facilitating the chemical reaction.

    What is the effect of pH on enzyme activity?

    Different enzymes have optimal pH levels for maximum activity.


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