The difference between independent & dependent variables.
What is:
DV-the factor that changes as a result of changes to the IV
IV - purposely change a variable to test a hypothesis
100
Theory or Law?
An object at rest stays at rest and an object in motion stays in motion unless acted on by an outside force.
What is Newton’s 1st Law
100
define density
What is the measurement of how much mass of a substance is contained in a given volume.
100
An example of a physical property.
What is melting point, hardness, density, shininess, ability to attract a magnet, ability to dissolve in water (solubility) flexible, conduct thermal energy and electricity, boiling point, color?
100
3 particles in an atom
What is Proton
Neutron
Electron
200
Why is it important to have multiple trials? *also called?
What is generally at least 3 trials are need to support a hypothesis
* also called Repetition
200
The difference between a theory and a law.
What is:
T - A well-tested explanation for a wide range of observations or experimental results
L - Describes an observed pattern in nature without attempting to explain it.
200
Formula & SI Units
What is density=mass/volume
g/cm3
g/mL
g/L
200
An example of a chemical property.
What is ability to burn (flammability), rust, tarnish?
200
Charges and location of the 3 particles in an atom
What is Proton – positive, in the nucleus
Neutron – neutral, in the nucleus
Electron – negative, in a cloud around the outside of the nucleus
300
A controlled experiment.
What is an experiment in which only one variable is manipulated at a time.
300
All substances are composed of particles called atoms.
What is Atomic theory
300
The density if a bolt is dropped into a graduated cylinder and the volume rises from 30 mL to 43 mL and the bolt has a mass of 101g.
What is 7.7 g/mL
300
The changes in state
L to S -
S to L –
L to G –
S to G -
What is L to S - freezing
S to L – melting
L to G – vaporization (boiling or evaporation)
S to G - sublimation
300
Who discovered:
Electron -
Proton –
Neutron -
What is Electron - Thompson
Proton – Rutherford
Neutron - Chadwick
400
What does it mean in an experiment if the hypothesis was not supported?
What is:
Hypotheses are valuable even when not supported because they can lead to further investigation
400
Which of the following is an example of a scientific law?
a. All cells are produced from other cells.
b. All objects in the universe attract each other.
c. All substances are composed of tiny particles called atoms.
d. Mass can be converted into energy and energy can be converted into mass.
What is b.
400
The density of a block of wood with a volume of 50 cubic centimeters and a mass of 100 grams.
What is 2 g/cm3
400
The difference btw physical and chemical properties
What is P – can be observed without changing the substance C – describes a substances ability to change
400
Why most of the alpha particles went straight through the gold foil in Rutherford’s experiment
What is most of an atom is empty space?
500
Kelly notices that if the water is cold then the antacid tablets will take longer to explode in a film canister. This is an example of a?
What is hypothesis
500
Why a scientist would reject a scientific theory.
What is that new evidence contradicts it.
500
The liquid(s) that will float on water if the density of corn syrup is 1.33 g/mL and the density of vegetable oil is 0.91 g/mL.
What is vegetable oil?
500
The reason why we use physical and chemical properties.
What is the properties are characteristic for a substance, so they never change because of the amount, therefore we can use to identify unknown substances?
500
According to modern atomic theory, it is nearly impossible to determine an electron’s exact:
a color
b position
c charge
d mass
Also called ____