Matter is made up of elements and compounds. Elements are the simplest form of matter and have unique properties, with 92 occurring naturally. Elements are represented by one or two letter symbols, with the first letter capitalized. Compounds are formed when elements chemically combine. A chemical reaction involves rearranging atoms to form new products. Physical properties can be observed without changing the chemical makeup, while chemical properties involve a chemical change. Density is a physical property that describes how tightly packed matter is and can be used to identify substances or solve problems.

1. UEQ: What is the Nature of Matter

3. Element is the simplest
form of matter that has
a unique set of
properties
There are 92 naturally
occurring elements and
including man-made
ones.

4.  One or two letters.
Only First letter is a capitalized.
Sometimes they are obvious…
C, Cr, H, He, B, Br
Other times…

5. Sodium(Na)= natrium-washing
Iron=
Copper=
Silver=
Gold=
Tin=
Lead=

6. The smallest unit of an element that retains the properties
of an element.

7. H2
 N2
 F2
 O2
 I2
 Cl2
 Br2

8.  CO carbon monoxide – odorless colorless gas, toxic byproduct
of combustion
 CO2 carbon dioxide- used by plants to produce glucose,
byproduct of respiration.
 H2O water- most important compound for living things.
 H2O2 peroxide- used as a disinfectant.

9. Cl is a greenish poisonous gas.
Na is a soft metal that reacts violently with
oxygen.
Together NaCl is table salt.

16. Boiling Point
Size of particle
Solubility
Magetism

22. The composition of matter changes.
Example : 2H2O -> 2H2 + O2

23. Sugar ---(oxidized)----> Carbon + Water
Water -----(electrolysis)- oxygen + hydrogen

24. During a chemical reaction the atoms are
rearranged to form new product!
Example : 2H2O -> 2H2 + O2
Example: Na + Cl -> NaCl

25. t
The PRODUCTS are on the
right. In this picture, two
molecules of water.
The REACTANTS are
written on the left. In this
picture, the element oxygen
and hydrogen.
The Arrow is read “yields”. In situation
problems you might see: reacts, forms,
decomposes, produces, and may more.

26. Generate a Gas – baking soda and vinegar
Change in Color- rusting steel
Form a precipitate- solid in a liquid
Change in Energy-
Temperature: ice pack or heat pack
Light: glow stick

27. The total mass never changes
Total Mass of Reactant = Total Mass of
Products
Watch Video!

28. 1. Read the problem.
2. Write the equation in words.
3. Write the masses underneath of each.
4. Add the addition sign and equal sign to make
a math equation.
5. Solve for the unknown
6. Write your answer with units as a statement!

29.  Methane + oxygen  carbon dioxide + water + energy
1. Which of these is not matter?
2. What might you observe that indicates its a chemical
reaction?
3. Which of these is an element?
4. What are the products?
5. What are the reactants?
6. If 165g of methane consume 25g of oxygen and produce 85g
water, how much carbon dioxide was also produced?

32. Physical properties can be observed and
measured without changing the chemical
make-up of the substance.
Ex: mass
Chemical properties can not be observed
without changing the substance
Ex: flammable

34. Intrinsic (characteristic) properties do not
depend on the amount of matter present.
Extrensic depend on the amount of matter.

35. These are the chemical and physical properties
that so not change with the size of the sample.
This means that whether you have 1ml or 100 mL
of water the properties are the same.
Characteristic properties like density can be used
to identify matter.

36. State
Color
Taste
Hardness
Density
Solubility
Melting point/freezing
point/boiling point
Conductivity
Malleability
Reactivity
Flammability

37. Assuming these blocks are made
of the same wood. The block on
the right would have more mass
and volume.
However they would have the
same….

38. He said NaBrO

39. What is density?
How can density be used to solve
problems?

40. Density is an intrinsic property of matter.
It describes “how tightly matter is packed”
Density = Mass
Volume
Units: g/cm3 or Kg/m3 or g/L or g/mL
(derived units)

41. Density generally decreases as temperature
increases.
Water is one of the special!