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Matter

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  • Oxidation occurs when substances combine with.... ?
    Oxygen
  • Give an example of a plastic object
    Plasticiline
  • Which is the mass?
    It's the amount of matter in an object
  • Which is the volume?
    It is the amount of space than an object occupies
  • What change do we use to transform milk into cheese or yogurt?
    Fermentation
  • Give an example of homogeneous mixture
    Ex. Milk with cocoa
  • If the change can be reversed and doesn't form a new substanse... What type of change is?
    A physical change
  • What mixture can we separate using this method? : DISSOLUTION
    Sand and salt
  • What is a solution?
    It's a homogeneous mixture made up of two or more liquids, or a liquid and a soluble substance
  • Give an example of a state change
    Ex. When we evaporate water
  • Give an example of heterogeneous mixture
    Ex. pizza
  • What mixture can we separate using this method? : DISTILLATION
    Alcohol and water
  • How do we calculate density?
    By dividing the mass of an object by its volume
  • What's the different between an elastic material and a plastic material?
    The elastic material return to its original shape and the plastic don't
  • When we separate liquids with differents boiling points we use this method
    distillation
  • What kind of mixture is If we can see the different components?
    A heterogeneous mixture
  • If the mass of a stone is 35 grams and its volume is 7 cubic centimeters. Which is its density?
    It's 5 g/cm3
  • If you cool an object, what happens with the molecules?
    They contract
  • A pure substance is...
    A substance with only one component
  • Which is the density of an object that its mass is 20 kg and its volume 5 cubic meters?
    It's 4 kg/m3
  • Which are the three basic properties of matter?
    Mass, volume and density
  • Which is the best way to separate a mixture of salt and sand?
    Filtration and evaporation (DISSOLUTION)
  • What type of change is when the snow start melting?
    A physical change
  • If the change can't be reversed and form a new substanse... What type of change is?
    A chemical change
  • What is condensation?
    The process of changing from gas to a liquid
  • Oxidation is a ______ change
    Chemical change
  • Which other physical properties we can find in matter?
    Hardness, solubility, thermal conductivity and electrical conductivity
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