SAT Chemisty Ch 1 Flashcard

Matter
anything that occupies space and has mass
Mass
quantity of matter which a substance possesses
weight

w=mg

GRAVITATIONAL FORCE

is weight or mass constant?

 

mass
inertia
property of mass to resist a change of position or motion
Density

D=m/V

relationship of mass to a unit of volume

Standard unit: grams/liter

 

solid
both a definate size and shape
liquid
has a definite volume but not a definate shape
gas
neither a definate shape or volume
How are states of matter changed?
addition or subtraction of heat energy
distinct substance

subdivided into the smallest particle that still has the properties of that substance

 

element
substance that is made up of only one kind of atom
atom

Greeks

smallest possible piece of something

compound
two or more kinds of atoms joined together in a definite grouping
Law of Definite Composition (Proportions)
combining atoms of two or more elements in a definite proportion
molecule
smallest naturally occurring unit of a compound
A molecule of a compound has….
definite shaped that is determined by how the atoms are bonded to or combined with each other
Mixtures

1.indefinite composition

2.properties retained

3.react differently to changed conditions

Distinct Substances

Elements

1.One kind of atom

2. Homogeneous

Compounds

1. Homogeneous

2. All parts react the same

3.Distinct and different properties from the elements that they are made up from

 

Heterogeneous
indefinite composition
Homegeneous
definite composition
Physical properties

properties that can usually be observed with our senses

ex. color, odor, solubility in water, density, taste, hardness

Chemical Properties

properties that can be observed in regard to whether or not a substance changes chemically

ex. iron rust, sodium reacts with water,water can be decomposed by an electric current

physical change

alters some aspect of the physical properties of matter, but the composition remains constant

ex. breaking glass, cutting wood, melting ice

 

Chemical changes

changes in the composition and structure of a substance

accompanied by engergy changes

exothermic reaction
engergy given off in form of heat or light or both
endothermic reaction
absorb more energy
activation energy
energy necessary to get the reaction going by increasing the energy of the reactants so they can combine

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