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Chemical Changes, etc

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  • What happens to atoms during a reaction
    they multiply
    they rearrange
    they disappear
    they shrink
  • Explain why rust is considered a chemical change
    it creates a new substance (iron oxide)
  • What is a reactant
    the substance that is changed in a reaction
    a type of energy
    a type of atom
    the final substance created
  • Give one example of a physical change
    melting ice
  • What is density
    how much mass is in a given volume
    how shiny something is
    how fast an object moves
    how hot something is
  • Which is an example of a physical property
    reactivity
    flammability
    toxicity
    texture
  • What makes something a chemical property
    it describes size and shape
    it describes temperature only
    it describes color only
    it describes the ability to undergo a chemical change
  • Describe what happens to particle motion when a liquid boils
    particles move fast enough to break away into vapor
  • What is flammability
    how much space it fills
    how easily something dissolves
    how flexible something is
    how easily something lights on fire
  • What does reactivity describe
    how smooth something feels
    how well something floats
    how easily something reacts with oxygen or water
    how flexible something is
  • Name a sign of chemical change
    formation of gas
  • What is volume
    the heaviness of an object
    the amount of space something takes up
    the speed of particles
    the number of atoms in an object
  • What determines the state of matter?
    particle movement and spacing
  • Give one example of a chemical property
    flammability
  • What does the law of conservation of mass mean
    mass stays the same during changes
    mass only applies to solids
    mass increases during changes
    mass disappears during changes
  • How do particles behave in a solid
    they vibrate in fixed positions
  • What is a product in a chemical reaction
    the heat released
    the starting material
    the gas that forms
    the substance made after the reaction
  • What happens to the total mass during a reaction according to the law of conservation of mass
    it stays the same
  • What does oxidation often involve
    the formation of a physical change only
    a decrease in temperature
    a reaction with oxygen
    a change from liquid to solid
  • Explain what oxidation is
    reacting with oxygen
  • What does flammability tell you about a substance
    how easily it burns
  • Define mass in your own words
    the amount of matter in an object
  • Describe the difference between a reactant and a product
    reactants start the reaction products form at the end
  • Describe what reactivity means using your own words
    how quickly a substance reacts with something else
  • What is a coefficient in chemistry
    the total mass in the reaction
    the temperature needed for a reaction
    the number showing how many molecules are present
    the number of electrons in an atom
  • Describe what a coefficient tells you in a chemical equation
    how many molecules are present
  • What is a chemical reaction
    when something freezes
    when substances change into new substances
    when something melts
    when something changes shape only
  • Which is a sign of a chemical change
    breaking into pieces
    melting
    freezing
    formation of a gas
  • What happens in a chemical change
    only the size changes
    only the temperature changes
    the substance stays the same
    new substances form
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