Shared Flashcard Set

Details

Dec. Science Exam
vocabulary
29
Science
8th Grade
12/17/2009

Additional Science Flashcards

 


 

Cards

Term
Base Unit used for length
Definition

meter

m

Term
Base Unit used for mass
Definition

gram

g

Term
Base Unit used for time
Definition

second

s

Term
Base Unit used for volume
Definition

centimeters cubed

cc or cm^3

Term
Base Unit used for electric current
Definition

ampere

A

Term
Base Unit used for temperature
Definition

Kelvin

K

Term
base unit used for amount of substance
Definition

mole

mol

Term
base unit used for intensity of light
Definition

candela

cd

Term
steps of the scientific method
Definition

1. state scientific question

2. gather background information

3. form a hypothesis (educated guess)

4. test hypothesis

5. analyze data

6. draw a conclusion

Term
independent variable
Definition

variable in the equation that you change

 

ex. plant experiment: amount of soil

Term
dependent variable
Definition

the variable that changes depending on how you change the independent variable

 

ex. plant experiment: growth of plant

Term
constant (variable)
Definition

variable in the equation that always stays the same

 

ex. plant experiment: type of soil, amount of sunlight, amount of water given, etc....

Term
what is science?
Definition
a quest for "patterns in nature" to understand it and form a body of knowledge that has "predictive power" and "an application in society"
Term

what is a graph and why do we use them?

define these: bar graph, pie chart, line graph

Definition

a visual display of data; they are important because they help us compare data to each other

 

bar graph:each bar represents a number counted at a specific point in time; good for counting

 

pie chart: shows how a fixed number gets broken down into sections

 

line graph: shows the relationship between the independent and dependent variables

Term
a graph should always include these three things
Definition

title

key

labeled x and y axis

Term
independent variable goes on the
Definition
x axis
Term
dependent variable goes on the
Definition
y axis
Term
time is always what variable?
Definition
INDEPENDENT
Term
name and define the three methods of heat transfer
Definition

conduction: thermal energy transfer by direct contact

 

convection: thermal energy transfer within an object (***REMEMBER THAT HEAT RISES***)

 

radiation: transfer of thermal energy through electromagnetic waves

Term
Kinetic Energy
Definition

energy of movement

KE=1/2mv^2

Term
Potential energy
Definition

energy based on an object's position

GPE=mgh

Term
temperature conversions
Definition

C=5/9(F-32)

F=9/5C+32

K=C+273

C=K-273

Term
kinetic theory
Definition

1. every object is made up of many small particles

2. these particles are always moving (fast, random motion)

3. these particles can transfer KE by bumping into each other

Term
What is temperature
Definition
avg. KE of a substance's particles
Term
what is thermal energy?
Definition
KE+GPE
Term
change in thermal energy
Definition

Q=mc"triangle"T

change in thermal energy=mass*specific heat*change in thermal energy (Tfinal-Tinitial)

 

negative answer: energy was released

positive answer: energy was absorbed

 

Term

What is specific heat?

what is the specific heat of water?

Definition

amount of thermal energy needed to raise 1 kg of a substance by 1 C

 

4184 J/kg C

Term
What happens to the particles that make up an object when you heat them up?
Definition
they gain KE and expand
Term
The measure of the average kinetic energy of a substance's particles
Definition
temperature
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