-
Scientific method
- 1. Observations (including measurements
- 2. Hypothesis ( allows one to make predictions which leads to tests or experiments on the hypothesis)
- 3. Experiments
- 4. Theory
-
-
Hypothesis may be changed if...
experiments do not support it
-
Theory may be modified if....
additional experimetns do not support it
-
Hypotheses explains...
A small series of data, gone through little testing, and one has little confidence in it
-
Theory explains
A large series of data, gone through much extensive testing, and one has great confidence in it
-
Scientific law is
something you cant break
-
A scientific law is _________ and a theory can be used to ______
what happens
explain a law
-
Energy is ________
the ability to do work
-
-
Kenetic energy is
the energy of motion
-
Potential Energy is
stored energy (position or composition)
-
Food has stored energy in the form of ________
composition
-
Composition refers to the ________ makeup
chemical
-
How is energy measured?
by converting it to hear them by measuring the heat
-
Heat is measured by the
Calorie and Joule
-
1 gram H2O + 1 calorie
temperature rises by 1 degree C
-
Kilocalorie is equal to _______ calories
1000
-
How many Joules = 1 calorie?
4.189
-
Kilojoule is equal to
1000 Joules
-
Temperature is the _______ of heat
measurement
-
Freezing point in Celsius
0 degrees C
-
Freezing point Fahrenheit
32 degrees F
-
freezing point Kelvin
273 degrees K
-
Normal body temp Celsius
37 degrees C
-
Normal body temp Fahrenheit
98.6 degrees F
-
Normal body temp Kelvin
310 degrees K
-
Boiling point Celsius
100 degrees C
-
Boiling point Fahrenheit
212 degrees F
-
Boiling point Kelvin
373 degrees K
-
Celcius to kelvin
K= C + 273
-
Celcius to Fahrenheit
1.8C + 32
-
What is specific heat?
The ability to store heat
-
Specific Heat =
Number of Calories or joules needed to raise 1g by 1 degree C
-
What is Matter?
anything that has mass and occupies space
-
pure substance
matter that has a fixed or constant composition
-
what is a mixture?
two or more substances are physically mixed, but not chemically combined
-
what is an element?
the simplest type of a pure substance, composed of only one kind of material
-
What is a compound?
pure substance, but consists of 2 or more elements chemically combined in the same proportion
-
Mixers do not have to be.....
even proportions, compounds do
-
Heterogeneous mixture
the components do not have a uniform composition ( pennies in water)
-
Homogeneous mixture (solution)
the composition is uniform throughout the sample (salt water, a solution of salt and water)
-
What is a property?
trait or characteristic of a substance
-
A physical property....
can be measured or observed without changing composition
-
A chemical property...
is only observable or measurable when the substance unergoes a change in composition
-
A state (solid liquid or gas) is a
physical property
-
3 important parts of a measurement
-
1 inch = _____ cm
2.54 cm
-
how many pounds in 1 kg?
2.205
-
how many gt in a liter?
1.06
-
how many g in a lb?
454 g
|
|
