Physical Science

the basic unit of length

meter

how many cm are in a meter

100 cm

how many mm are in a meter

1000 mm

meters,cm,and mm are measured using

metric ruler or meterstick

the basic unit of mass is a

gram

how many grams in one lb.

453.6 grams

there are how many mg in a gram

1000 mg

how many grams in a kg

1000 grams

how is mass measured

using a triple beam balance

the basic unit of volumes is a

liter

one liter equals about how many quarts

1 qt.

how many mL in a liter

1000 mL

what is density

the mass per unit of a substance

formula for density

Density = mass/volume OR D = m/v

temperature at which water freezes

0 degrees Celsius

temperature at which water boils

100 degrees Celcius

what is matter

anything that has mass and takes up space

what is an element

a substance that cannot be broken down into simpler substances

what is the smallest element that maintains the property of that element

atom

what is a compound

a substance made of atoms of two or more different elements that are chemically combined

what is a molecule

smallest unit of a substance that behaves like that substance

what IS a pure substance

a molecule that has a fixed composition and definite proporties, can be a single element,has chemically combined components

what is a mixture?

a combination of two or more substances that are not chemically combined

mixtures can be separated into what

its components

mixtures are formed by mixing what?

pure substances.

heterogeneous mixture

substances in it are not mixed uniformly and are not evenly distributed

homogeneous mixture

components are equally mixed and are the same throughout

physical properties

very easy to observe,can be observed and measured without changing the composition of matter

examples of physical properties

color,texture,shape,odor,melting point,boiling oint,strength, hardness,electricity,and magnetism

chemical properties describe what

how a property reacts

examples of chemical properties

flammability, reactivity

what is the kinetic theory?

all matter is made of atoms and molecules that act like tiny particles. these particles are ALWAYS in motion. At the same temperature , heavier particles move slower than lighter ones.

particles in a solid are in what position

fixed

solids have a definite what

shape and volume

crystalline solids

have orderly arrangements of atoms and molecules

amorphous solids

no orderly arrangements

particles in a liquid are in what position

closely packed but can slide by each other

liquids can change what

shape

liquids can't change what

volume

liquids have what kind of tension

surface

particles are in what position in a gas

constant state of motion and rarely stick together

what is plasma

a state of matter that starts as a gas then becomes ionized

natural plasmas are

lightning, fire,and the aurora borealis

a change of state involves what

the changing of a substance from one physical form to another

CHANGES IN STATE

CHANGES IN STATE

condensation

from gas to liquid

freezing

from liquid to solid

melting

from solid to liquid

evaporation

from liquid to gas

sublimation

from gas to solid

solubility

the maximum amt. of a solute dissolved in a given quantity of solvent at a given temperature and pressure

concentration

the amt. of solute dissolved in a given volume of solution

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