# Physical Science Practice Test Questions

### 52 terms by mike_millercav Teacher

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Physical Science

meter

100 cm

1000 mm

### meters,cm,and mm are measured using

metric ruler or meterstick

gram

453.6 grams

1000 mg

1000 grams

### how is mass measured

using a triple beam balance

liter

1 qt.

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

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

its components

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.

fixed

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

shape

volume

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

### 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

Example: