Heating change state

• What happens to a substance when it is heated at certain temperatures?

  It changes its state between solid, liquid, and gas.
• At what temperature does water boil and change from liquid to gas?

  100° C
• What happens to the temperature of a substance during a change of state?

  The temperature remains constant during the change of state.
• Why do students often get penalized in exams regarding changes of state?

  They forget that temperature does not change during a change of state.
• What happens to the kinetic energy of molecules during a change of state?

  The kinetic energy of molecules remains unchanged.
• What determines the temperature of a substance?

  The temperature is determined by the kinetic energy of its molecules.
• What happens to the energy supplied to molecules during a change of state?

  The energy is used to weaken or break the bonds between molecules.
• How are molecules held together in a substance?

  By intermolecular bonds.
• What analogy is used to describe intermolecular bonds?

  They can be thought of as springs that stretch or contract.
• What occurs when enough energy is supplied to break the bonds between molecules?

  The bonds will break, leading to a change of state.
• What happens to the bonds when thermal energy is removed from a substance?

  The bonds will reform.
• What is an example of a physical process regarding changes of state?

  The breaking and forming of bonds during a change of state.
• What are the three different states of matter based on molecular arrangement?

  Solids, liquids, and gases.
• How are molecules arranged in solids?

  Molecules are held together by strong bonds and cannot move much.
• How are molecules arranged in liquids?

  Molecules are held by weaker bonds and can flow around each other.
• How are molecules arranged in gases?

  Molecules have next to no bonds and can move freely.
• What happens during melting and boiling in terms of molecular bonds?

  Bonds are breaking as energy is supplied to change the state.
• What happens during condensation and freezing in terms of molecular bonds?

  Bonds are reforming as energy is lost.
• What is sublimation?

  A process where a solid changes directly to a gas.
• How does evaporation differ from boiling?

  Evaporation occurs slowly without reaching a boiling point.
• How does evaporation work in terms of energy absorption?

  Liquids take in heat from the surroundings to break bonds.
• What is a common application of evaporation in cooling the body?

  Sweating helps cool the body by evaporating sweat.
• How does sweat help in cooling down the body during exercise?

  Sweat takes in heat from the body to evaporate, lowering body temperature.
• Why does sweat evaporate faster than the surrounding air?

  It actively takes in heat from the body for evaporation.
• What is the purpose of the Launchpad learning platform mentioned in the material?

  To help students achieve top results in their exams through interactive learning.
• What types of resources does the Launchpad learning platform offer?

  Interactive quizzes, easy-to-follow videos, and AI tutor support.
• What is the goal of the Launchpad learning platform?

  To motivate students and support them in their learning journey.