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Chemistry — Intermediate

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IntermediateScience
Today's questions

Today's quiz questions

These are the questions that make up today's quiz. Test your knowledge, see how much you know, and learn from the explanation behind every answer.

  1. 1.What is a catalyst?

    • •A substance that speeds up a reaction without being consumed
    • •A substance that stops a chemical reaction
    • •A product formed during an exothermic reaction
    • •A reactant that is used up to create products

  2. 2.What type of bond holds water molecules together?

    • •Van der Waals forces
    • •Hydrogen bonds
    • •Ionic bond
    • •Covalent bond

  3. 3.What is the ideal gas law?

    • •v = d/t, describing the speed of gas particles
    • •F = ma, describing the force on gas molecules
    • •PV = nRT
    • •E = mc², relating energy and mass of gas molecules

  4. 4.What is a polyatomic ion?

    • •A charged group of covalently bonded atoms acting as one ion
    • •An ion made of radioactive elements
    • •A molecule with no overall charge
    • •An atom with multiple charges

  5. 5.Which scientist discovered polonium and radium?

    • •Dorothy Hodgkin
    • •Rosalind Franklin
    • •Lise Meitner
    • •Marie Curie

  6. 6.What is the formula for sulfuric acid?

    • •HCl
    • •H₂SO₄
    • •H₃PO₄
    • •HNO₃

  7. 7.What is the molar mass of water (H2O)?

    • •20.00 g/mol
    • •16.00 g/mol
    • •32.00 g/mol
    • •18.015 g/mol

  8. 8.What is activation energy?

    • •The energy stored in chemical bonds
    • •The minimum energy needed for a reaction to occur
    • •The energy released when products are formed
    • •The kinetic energy of molecules at room temperature

  9. 9.What does the rate law of a reaction describe?

    • •The maximum amount of product that can be formed
    • •The temperature at which a reaction occurs fastest
    • •The relationship between reaction rate and reactant concentrations
    • •The order in which reactants must be mixed

  10. 10.What is the difference between a saturated and unsaturated solution?

    • •A saturated solution holds the maximum solute; an unsaturated one can dissolve more
    • •Saturated solutions are hotter than unsaturated ones
    • •Saturated solutions are always colored; unsaturated are colorless
    • •Unsaturated solutions have no solute dissolved in them