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I. Properties of MatterA. Physical properties
1. Definition - any characteristic that can be observed or measured without changing the material;
Think!! – What can you physically observe in a material?
- What could you measure in a material?
2. Examples - color, mass, volume, length, luster, density (m/v), shape, taste, odor, texture, hardness, conductivity, melting/ boiling points, metal, nonmetal, states of matter
3. States of Mattera. Solid – particles close together; low energy;
definite shape & volume
b. Liquid – particles medium distance & energy; no def. shape & def. volume
c. Gas – particles far apart; high energy; no definite shape or volume
(Plasma – occurs at high
temps.)
d. Phase Diagram – states affected by pressure & temp.
Phase diagram of water –melting, freezing, evaporation, condensation – add to diagram
B. Chemical property –
1. Definition - characteristic that allows a substance to change to a new substance
Think! – How could paper or wood turn to a new substance?
- How could copper or a nail
turn to a new substance?
2. Examples - flammability (burning) – paper, wood, oxygen
rusting (reaction) – iron
tarnishing (reaction) – silver, copper
reactivity (reacts w/other substances) – vinegar w/baking soda; sodium
+ water; fireworks
II. Changes of Matter
A. Physical changes – only changes what the substance looks like; not something new
Ex. separating substances – (ex. coins)
crushing/grinding – making smaller
combining of substances – dye + water
change of state – melting/freezing
B. Chemical changes – changes to a new substance; signs: production of heat, light, smoke, change in color or smell,
Ex. Burning
rusting – Fe + O2 Fe2O3
tarnishing – Ag2O + H2SAg2S + H2O
reactions
Photo. CO2 + H2O C6H12 O6 + O2
III. Basic Types of Matter – elements, compounds, & mixtures
A. Elements – composed of 1 kind of atom; pure - (found on the periodic table)
1. Ex. C, H, N, O, P, S, Au, Ag, Cl, Fe, Ca, Na, He, Ne, Cu
2. Atom – simplest indivisible particle
a. proton: + charge; in nucleus
b. neutron: neutral charge; in nucleus
c. electron: - charge; in shells
3. Finding # of p+, n, & e- : look at periodic table – different #s give different properties
Top # = # of protons, # of electrons (P,E)
Bottom # rounded = mass # = (mass of nucleus)
# of protons + neutrons
# of protons = ______
# of electrons = _____
mass # = __________
# neutrons = _______
Ex. Lithium:
3 = 3 p+ / 3 e-
Li
6.941 = round to 7 then
subtract 3 = 4 neutrons
Ex. Sodium (Na) – do on own
B. Compounds – 2 or more elements chemically combined; can’t be physically separated; pure
1. Have formulas – atoms have definite ratios - NaCl; H2O; CO2; MgO, NH3
(ammonia), C6H12O6 (glucose)
subscript gives you # of atoms of each element –
ex. NaCl : 1 Na & 1 Cl
H2O : 2 H & 1 O
NH3 : 1 N & 3 H
3. Compounds go through chemical rxns:# of atoms & mass of reactants must equal # of
atoms & mass of products (law of conservation of matter/mass)
reactants products
2H + 2 O H2O2 (same # of atoms)
2 g H + 32 g O 34 g H2O2 (same mass)
4. LAW OF CONSERVATION OF MASS/MATTER = mass/matter of the reactants = the mass of the products; mass is neither created nor destroyed
1. Homogeneous mixture – same composition throughout called a solution; evenly mixed
Ex. saltwater, coffee, koolaid, air, motor oil, tea
Water often does the dissolving in a mixture – called the “universal solvent”
2. Heterogeneous mixture – has different composition throughout; unevenly mixed
Ex. muddy water, concrete, granite, lemonade w/pulp, watch
IV. ApplicationA. E,C, M – form all natural resources such as:. Oil,
coal, natural gas, metals, stones, sand, air, sun,
soil, water, animals, birds, fish
and plants.
B. Natural resources are used to make:
food, alternative fuels and raw materials for the
production of goods, such as paper, medicines,
electronics, clothes, appliances, & cars
• Products Made from Natural Resources
• Trees Paper, furniture, fuel• Cotton Clothing• Oil/petroleum Plastic, fuel• Natural gas Fuel• Coal Fuel• Iron ore Steel products (cans, bridges)• Bauxite ore Aluminum products (cans, car• parts)• Gold Jewelry, dental material• Copper Wire, coins, electrical equipment• Manganese Steel, cast iron• Cobalt Steel, jet engine parts, cutting• tools• Platinum Air pollution control and telecommunications• equipment, jewelry• Chromium Stainless steel, green glass,• leather treatment• Diamonds Jewelry, mechanical equipment
C. Natural resources impact society - can cause environmental problems such as: air, land and water pollution; disruption or destruction of ecosystems; and a decrease in biodiversity.
D. Natural resources are: LIMITED – Therefore, we need to reduce, reuse, & recycle