Riddle

1
Riddle

• It can be anything, and it makes up everything.
• But it always takes up space and has mass.
• What it is?

MATTER
2
Matter and Its Changes

• Chapter 2.1

3
Chemistry Definition

• The study of properties of matter and how it
  changes

4
What is Matter?

• Anything that
• Has Mass
• Takes up Space (volume)

5
Building Blocks of Matter

• Elements Cannot be broken down into any other
  substance by chemical or physical means
• All matter around you is composed of one element
  or a combination of elements

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Building Blocks of Matter - 2

• Molecule 2 or more atoms chemically bonded
  together, making a new substance
• Compound A molecule made of 2 or more elements,
  making a new substance

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Building Blocks of Matter - 3

• Mixture 2 or more substances mixed by not
  bonded to make a new substance
• Solution a well mixed mixture in liquid form
  (salt water)

8
Homogeneous vs. Heterogeneous

• Homo means same
• Hetero means different
• Homogeneous mixture is the same everywhere
• Cant see individual pieces, cant filter
• Heterogeneous mixture is not the same everywhere
• Different in different places
• Can see the pieces
• Can filter usually

9
Mixing Liquids

• Miscible
• two liquids that dissolve in each other. They
  mix to form a solution
• Immiscible
• Two liquids that dont mix and stay mixed. They
  may make a suspension, but they dont make a
  solution

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Changes in Matter - 1

• Physical Change change in form or appearance
  that does not change the actual substance (ice to
  water to steam)

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Changes in Matter - 2

• Chemical Change substances mix to form new
  substances with different properties

12
Observing Chemical Reactions

• Key Characteristic production of new materials
  that are chemically different from the starting
  materials
• Gas released
• Temperature change
• New solid material
• Smell
• etc

13
Chemical Reactions on a Small Scale

• ONE (1) particle of an element is an ATOM
• Molecule 2 or more atoms combined

14
Chemical Reactions on a Small Scale

• Chemical BONDS are the glue that holds atoms
  together
• Chemical REACTIONS occur when chemical bonds are
  formed or broken.

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Section 1.1 Review Questions

• 1. How are element, compound, mixture different?

• Element cannot be broken down.
• Compound is two or more elements combined
  chemically.
• Mixture is 2 or more items that can be physically
  separated

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Section 1.1 Review Questions

• 2. What forms of evidence show a chemical
  reaction has take place?

• New substances are formed, can be seen by color,
  precipitation, gas released, temperature changes,
  changes in properties.

3. What happens to chemical bonds in a chemical
reaction?

• Bonds are broken or new bonds may form

17
Section 1.1 Review Questions

• 4. What is difference between atom and molecule?

• Atom is smallest particle of an element.
  Molecule is combination of 2 or more atoms

• Ice cream melting is physical.
• Sugar dissolving is physical
• Gasoline burning is chemical
• mirror fogging is physical
• milk souring is chemical

5. Classify changes for Ice cream, sugar,
gasoline, mirror, milk