Chemical Reactions and Balanced Equations
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Questions and Answers

Why does water have a different physical state compared to hydrogen and oxygen?

  • Water has stronger intermolecular forces due to its non-polar nature. (correct)
  • Water has weaker intermolecular forces due to its non-polar nature.
  • Hydrogen and oxygen are both liquids at room temperature and pressure.
  • Hydrogen and oxygen have a polar nature.

    • What characteristic of hydrogen, oxygen, and water contributes to water not being flammable?

  • The different chemical bonds in water compared to hydrogen and oxygen. (correct)
  • The presence of gas in hydrogen and oxygen.
  • The production of thermal energy during the reaction.
  • The liquid state of water.

    • What is a sign of a chemical reaction based on the text?

  • Reduction in mass.
  • Decrease in pressure.
  • Formation of flammable gases.
  • Increase in temperature. (correct)

    • In the Law of Conservation of Matter, what does it mean for matter to be transformed?

    <p>Matter can change from one form to another.</p> Signup and view all the answers

    What does the Law of Conservation of Matter state about the total number of atoms in reactants and products?

    <p>The total number of atoms is equal in reactants and products.</p> Signup and view all the answers

    How does electrolysis break substances apart?

    <p>Using electricity.</p> Signup and view all the answers

    What does the arrow in a chemical equation symbolize?

    <p>Transformation of reactants into products</p> Signup and view all the answers

    Why is it important to have a balanced chemical equation?

    <p>To ensure no new atoms are created during the reaction</p> Signup and view all the answers

    What does putting a coefficient in front of a chemical formula do in an equation?

    <p>Balances the number of atoms of that element</p> Signup and view all the answers

    What is the purpose of balancing a chemical equation?

    <p>To ensure conservation of atoms</p> Signup and view all the answers

    What happens if a chemical equation is not balanced?

    <p>It does not accurately represent the reaction</p> Signup and view all the answers

    Why do scientists need to balance the number of atoms in a chemical equation?

    <p>To ensure mass is conserved in the reaction</p> Signup and view all the answers

    Study Notes

    Chemical Reactions

    • Chemical reactions involve breaking bonds in reactants and forming new bonds to create products.
    • Atoms rearrange during a chemical reaction, resulting in changes to both physical and chemical properties.
    • New substances with different properties are formed during a chemical reaction.

    Inter molecular Forces

    • The difference in intermolecular forces between substances determines their physical state.
    • Hydrogen and oxygen are gases at room temperature and pressure, but water is a liquid due to stronger intermolecular forces.

    Chemical Properties

    • Hydrogen and oxygen are flammable gases, but water is not flammable due to different chemical bonds between atoms.

    Signs of a Chemical Reaction

    • Signs of a chemical reaction include:
      • Production of gas
      • Production of solid
      • Production of light
      • Production of thermal energy

    Electrolysis

    • Electrolysis is a reaction that uses electricity to break down substances into their component parts.
    • An electrolysis lab can produce characteristics of oxygen and hydrogen.

    Law of Conservation of Matter

    • The Law of Conservation of Matter, also known as the Law of Conservation of Mass, states that matter cannot be created or destroyed in a chemical reaction, only transformed.
    • This law was first discovered by Antoine Lavoisier in the late 18th century.
    • The Law of Conservation of Matter applies to both open and closed systems.

    Chemical Equations

    • A balanced chemical equation ensures that the same number of atoms of each element are on both sides of the equation.
    • To balance an equation, coefficients are used to ensure that the number of atoms of each element is equal on both sides.
    • The arrow in a chemical equation symbolizes a change from reactants to products.

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    Description

    Learn about how chemical reactions involve breaking bonds in reactants to create new products. Understand the importance of balancing a chemical equation to ensure conservation of atoms on both sides.

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