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32 Cards in this Set

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What are physical changes
Effect only the physical properties. You don't make something new. There are alterations in the form, but not in the matter itself. Crushing, tearing, and changes in state are examples of physical properties.
What are examples of physical properties.
Breaking up a piece of chalk, melting an ice cube (phase change) dissolving salt in water, magnetizing iron, boiling water.
H2O(s) - H2O(l)
What are chemical changes.
A change that produces one or more new substances. You make something new.
Examples of chemical changes.
Burning toast, cooking an egg, wood burning, iron rusting, wood rotting. Chemicals getting rearranged.
Ni+2AgNO3 - Ni (NO3)2 + 2Ag
Definition of intensive
Innate or inborn. These properties can be used to identify a substance. The amount of substance will not matter.
Examples of intensive
Melting point, boiling point, density, color,
The density of H2O is 1.0g/mL whether you have 10 mL or 500 mL.
Definition of extensive
Properties that give you amounts. They cannot be used to idenify a substance.
Examples of extensive
Length, mass, volume.
Who's Lavosier
Discovered that the number and kinds of elements stay the same, they just got rearranged. He proposed the law of conservation of matter.
Law of Conservation of matter.
Matter is neither created nor destroyed by a chemical change. The only exception is nuclear chemicals.
THe most common element in the earth is

The most common element in the universe

Oxygen can be in a:
free state O2 (g), elemental state, combined state - FeO or H2O
Matter classifications
elements, compounds, and mixtures.
substance that cannot be separated into simpler substances by a chemical change.
EX. Helium, oxygen, hydrogen
The periodic table
Contains all of the known elements (over 100 different kinds)1 or 2 letter abbreviations, the first letter is always capitalized. The elements are named after people, places, planets, etc.
EX. Plutonium, Californium, Curium (scientist)
a substance that contains 2 or more different elements combined in a fixed proportion.
Examples of compounds
EX. table sugar, C12H22O11, NaCl (table salt) MgO(s)
elements and compounds
EX O2(g), Al (s)(aluminum foil), H2O.
2 Ways to idenify properties of matter
physical and chemical properties
Physical properites
characteristics that you can observe without making something new.
Examples of Physical properties
density, color, meliting point, boiling point, odor, taste, hardness, electrical conductivity, etc.
EX melting an ice cube
Chemical properties
characteristics that describe how the substances interacts with or fails to interact with other substances to produce new substances.
Examples of chemical properties
EX. flammability, reactivity with other substances
EX. L, Na, and K all react vigorously to water.
EX. 2Na (s) + 2 H2O(l) - 2NaOH (aq)+ H2 (g)
anything that has mass and takes up space.
EX a ball, air in the room, a glass of water
Not Matter
a radio wave, a beam of sunlight, an X ray bean. These are formes of energy.
The best way to measure matter
depends on temp
EX 10 L of H2O(g) at 100 C vs 1.0L of H2O (l) at 20 C (room temp) Much more H2O at room temperature.
depends on where you are
EX on the moon you weight 1/6 of what you weigh on Earth. At the poles you have a slightly different weight.
Fixed volume and shape, high density
EX ice, chair
fixed volume, but variable shape, high density
EX liquid, water, mercury at room temperature.
no fixed shape or volume expands to fill any container it occupies, low density.
EX air, helium
high energy state, interior of sun.