chapter 2: matter and change 2.1 matter. i. properties of matter a. substance: matter with uniform...
TRANSCRIPT
Chapter 2: Matter and Change
2.1 Matter
I. Properties of Matter• A. Substance: matter with uniform and definite
composition
• Write down 3 examples.
Which of the following is NOT a substance?
Pure Gold (Au) Dry Ice (Solid Carbon Dioxide) (CO2)Milk
• B. Physical Property: condition of substance observed without changing composition
• Write down 3 examples for the object below.
Gallium (Ga)
II. States of Matter• A. Solid: definite shape
and volume, tightly packed particles
• B. Liquid: fixed volume, takes shape of container
• C. Gas: takes shape and volume of container
III. Physical Changes• A. Altering a material without changing
composition• Write down which physical change is
described in each picture.
2.2 Mixtures
I. Classifying Mixtures• A. Mixture: physical combination of 2 or more
substances
1. Can be consistent (Homogeneous) or different composition throughout (Heterogeneous)
Are these mixtures homogeneous or heterogeneous?
• B. Solution: a homogeneous mixture, can be solids, liquids, or gases
• C. Phase: any part of mixture that is consistent
Oil and water heterogeneous mixture has two phases
II. Separating Mixtures• A. Distillation: separating a mixture by boiling
liquid to vapor and then returning to liquid• B. Chromatography: separating substances by
their mass
2.3 Elements and Compounds
Hemoglobin Molecule
I. Element vs. Compound• A. Element: simplest naturally existing form of
matter (periodic table)
• B. Compound: two or more different elements combined
Label these as: elements, compounds, or mixtures?
• C. Compounds only separated by chemical means
Ex. Sugar Caramel Carbon + water vapor
• D. Properties of compounds different than partsEx. Sodium (reactive metal) + Chlorine gas (poisonous) Sodium Chloride (Salt)
II. Symbols and Formulas• A. Elements represented by symbols• B. Most are first one or two letters of element• C. Some represent Latin or Greek namesFind 4 elements that have symbols that are
NOT their first one or two letters.
2.4 Chemical Reactions
I. Reactants to Products• A. Chemical Reaction: one or more
substances become new substances
Iron + Oxygen Iron Oxide (Rust)
Reactants Product
II. Detecting a Chemical Reaction• A. Chemical Property/Change: undergoes
chemical rxn to form new substances
Ex. Rusting, burning, exploding, fermenting
• B. Chemical rxns always give off or absorb energy (temp. change or light)
• C. Other signs: Color, Odor, Precipitate (solid that settles out of liquid mixture)
III. Conservation of Mass• A. During any chemical reaction, the amount of
matter is unchanged