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Changing Matter. Physical & Chemical Changes. What different ways can we differentiate between people?. Properties How we identify something. Matter has properties. Two basic types of properties that we can associate with matter. Physical properties Chemical properties.

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changing matter

Changing Matter

Physical & Chemical Changes

matter has properties
Matter has properties
  • Two basic types of properties that we can associate with matter.
    • Physical properties
    • Chemical properties
physical properties
Physical Properties
  • Anything that can be observed without changing the identity of the substance. (Tends to be measurable.)
  • melting point
  • boiling point
  • electrical conductivity
  • color
  • density
  • thermal conductivity
  • ductility
  • malleability
malleability
Malleability
  • The ability of an object to be molded into different shapes.
    • Example – metals.

Opposite – Brittle, not flexible.

ductility
Ductility
  • The ability of an object to be drawn into thin wires without losing strength.
    • Metals are ductile.
chemical properties
Chemical Properties
  • The way a substance may change or react to form other substances
  • combustion
  • reactivity with water
  • PH
  • Oxidation
  • Flammability
  • Reactivity to other chemicals

Combustion - the process of burning something

matter can be changed two ways
Matter can be changed two ways
  • Physically
    • Physical reaction
    • Physical change
  • Chemically
    • Chemical reaction
    • Chemical change
physical changes
Physical Changes
  • DoNOT CHANGE THE TYPE OF MATTER
    • Nothing new or different is formed
      • Could be a change in:
        • Mass
        • Volume
        • Density
        • Change in state
        • Color
        • Shape

Size

physical changes1
Physical Changes
  • Substance may seem different, but the way the atoms link up is the same.
  • It changes phase (freezes, boils, evaporates, condenses, sublimates)
examples of physical changes
Examples of Physical Changes
  • Boiling
  • Freezing
  • Dissolving
  • Breaking
  • Making a mixture
    • 2 or more types of matter (substances) mixed together
    • Not in specific amounts
    • Can be separated physically
chemical changes
Chemical Changes
  • Chemical changes, or chemical reactions, are changes that result in the production of another substance. 
  • Changes the way the molecules link up (chemical composition)
  • Makes new substances (new compounds, or compounds are broken down into the elements that make them up)
    • The substances present at the beginning of the change are not present at the end; new substances are formed. The change cannot be “undone.”
chemical changes1
Chemical Changes
  • Evidence of a chemical reaction
    • Formation of gas
    • Formation of precipitate
    • Change in color
    • Change in energy (temperature)
      • EndothermicAbsorbs heat energy (gets cold)
      • ExothermicReleases heat energy (gets hot)
chemical changes2
Chemical Changes
  • Atoms are re-arranged, NOT created or destroyed
it s a chemical change if
It’s a chemical change if….
  • It burns
  • Temperature changes without heating/cooling
it s a chemical change if1
It’s a chemical change if….
  • It bubbles (makes a gas)
it s a chemical change if2
It’s a chemical change if...
  • It changes color
    • It forms a precipitate – (solid that forms from two liquids).
again signs t hat a chemical change has occurred
Again signs that a Chemical Change has occurred
  • Creation of a gas (bubbles)
  • Creation or loss of heat
  • Fire
  • Rotting
  • Breaking down (decomposition)
  • Precipitation (Sour milk clumps)
  • Cooking
  • Rusting (oxidation)
chemical change
Chemical Change
  • The only TRUE sign that a chemical change has taken place is the formation of a new substance.
  • A new substance that was not there before.
  • A new substance with a new chemical composition (Atoms are arranged differently).
basically what you re telling me is
Basically What You’re Telling Me Is…
  • If you end up with a chemical or chemicals that you did not start with,

It is a chemical change!!!!!!!

another example is
Another Example Is…
  • Eating…
  • Now eating can change food both physically and chemically.
  • Chewing is Physical but…
  • Once the food touches the chemicals in the saliva begin to change the food chemically.
law of conservation of matter
Law of Conservation of Matter
  • Matter is conserved type of atoms does not change
    • Nothing is created or destroyed
law of conservation of mass
Law of Conservation of Mass
  • Mass is conserved amount of atoms cannot change
  • Nothing is created or destroyed
what kind of change is it if someone
What kind of change is it if someone...
  • Tears up paper?
  • Physical change
  • Mixes salt and water?
  • Physical change
what kind of change is it if someone1
What kind of change is it if someone...
  • Burns paper?
  • Chemical change
  • Evaporates salt water?
  • Physical change
what kind of change is it if someone2
What kind of change is it if someone...
  • Mixes vinegar and baking soda?
  • Chemical change
physical and chemical changes quiz true or false
Physical and Chemical Changes Quiz ……….True or False??

1. With a physical change, no new substance is formed.  

2. With a chemical change, a chemical reaction occurs.

3. With a physical change, energy is either given off or absorbed.

4. A chemical change can be easily reversed.

5. Eating food can be considered both physical and chemical changes.

physical and chemical changes quiz answers
Physical and Chemical Changes Quiz……….Answers!

1. With a physical change, no new substance is formed.  TRUE

2. With a chemical change, a chemical reaction occurs. TRUE

3. With a physical change, energy is either given off or absorbed. FALSE

4. A chemical change can be easily reversed. FALSE

5. Eating food can be considered both physical and chemical changes. TRUE

online quiz
ONLINE QUIZ
  • http://www.fordhamprep.org/gcurran/sho/sho/review/rev15b.htm
physical or chemical change
Physical or Chemical Change?
  • Painting Wood
  • PHYSICAL
slide31

Physical or Chemical Change?

  • A ring tarnishing
  • CHEMICAL
slide32

Physical or Chemical Change?

Tarnish is a thin layer of corrosion that forms over copper, brass, silver, aluminum, magnesium and other similar metals as their outermost layer undergoes a chemical reaction. It causes to lose luster.

slide33

Physical or Chemical Change?

  • Burning Paper
  • CHEMICAL
slide34

Physical or Chemical Change?

  • Digestion of food
  • CHEMICAL
slide35

Physical or Chemical Change?

  • Sugar dissolving in water
  • PHYSICAL
slide36

Physical or Chemical Change?

  • Iron turning red when heated
  • PHYSICAL
slide37

Physical or Chemical Change?

  • Evaporation
  • PHYSICAL
slide38

Physical or Chemical Change?

  • A pond freezing in winter
  • PHYSICAL
slide39

Physical or Chemical Change?

  • Melting ice
  • PHYSICAL
slide40

Physical or Chemical Change?

  • Cutting wire
  • PHYSICAL
slide41

Physical or Chemical Change?

  • Painting fingernails
  • PHYSICAL
slide42

Physical or Chemical Change?

  • Cutting fabric
  • PHYSICAL
slide43

Physical or Chemical Change?

  • Baking muffins
  • CHEMICAL
slide44

Physical or Chemical Change?

  • Shattering glass
  • PHYSICAL
slide45

Physical or Chemical Change?

  • Decomposition of old leaves
  • CHEMICAL
slide46

Physical or Chemical Change?

  • Wrinkling a shirt
  • PHYSICAL
slide47

Physical or Chemical Change?

  • An old nail rusting
  • CHEMICAL