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Finals > Science > Flashcards

Science Flashcards

1
Q

Scientific method

A 
Question 
Hypothesis
Experiment
Data
Conclusion 
Retest/refine
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2
Q

The variable that you decide to change

A

Independent variable

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3
Q

The variable that changes as a result

A

Dependent

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4
Q

The variables that must NOT change

A

Control variable

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5
Q

A description of how close a measurement is to the true value of the quantity measured

A

Accuracy

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6
Q

The exactness of measurement

A

Precision

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7
Q

Anything that has mass and volume

A

Matter

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8
Q

Taking up space

A

Volume

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9
Q

Same throughout

Ex. Chocolate ice cream & tomato soup

A

Homogeneous

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10
Q

Samples may be different

EX. Rocky road ice cream & chicken noodle soup

A

Heterogeneous

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11
Q

Found on the periodic table

EX. Hydrogen carbon silver

A

Element

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12
Q

Two or more elements put together EX. H2O

A

Compound

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13
Q

Movement of molecules in the three phases of matter
A. Solid
B. Liquid
C. Gas

A

A. Molecules vibrate but can’t switch places

B. Molecules move over and around each other

C. Move randomly throughout the container

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14
Q

How tightly molecules are packed

A

Density

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15
Q

Formula for density

A

D=mass/volume

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16
Q

Positive, found in the nucleus, and equal to the atomic #

A

Protons

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17
Q

Neutral, found in the nucleus, and equal to the mass # - the atomic #

A

Neutrons

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18
Q

Negative, found in the electron cloud, and equal to the atomic #

A

Electron

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19
Q

Atoms of the same element with different numbers of neutrons

A

Isotopes

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20
Q

The electrons in the outer energy level

A

Valence electrons

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21
Q

These elements don’t react because they are already stable

A

Noble gases

22
Q

All elements want ______ valence electrons

A

8

23
Q

Most atoms are ___________ unless they bond

A

Unstable

24
Q

2 non-metals; share electrons

A

Covalent bonds

25
Q

A metal and a non-metal; transfer electrons

A

Ionic bond

26
Q

An atom that has gained or lost electrons and has an electrical charge

A

Ion

27
Q

All compounds have a charge of _______.

A

0

28
Q

Valence electrons and oxidation

A

Valence electrons is the outer energy level and oxidation is the charge

29
Q

Columns on the periodic table; same # of valence electrons; same oxidation #

A

Group

30
Q

Rows on the periodic table; same # of energy levels

A

Periods

31
Q

Breaking, cutting, melting

A

Physical change

32
Q

Burning, baking, rusting

A

Chemical change

33
Q

Uses energy; gets colder

A

Endothermic

34
Q

Produces energy; gets hotter

A

Exothermic

35
Q

Speed and direction

A

Velocity

36
Q

A change in speed or direction

A

Acceleration

37
Q

An action that has the ability to change motion

A

Force

38
Q

Objects tend to resist changes in motion

A

Inertia

39
Q

Equation associated with newtons 2nd law

A

F=mxa

40
Q

The strength of a objects motion

A

Momentum

41
Q

Stored energy

A

Potential

42
Q

Energy in motion

A

Kinetic

43
Q

Energy can not be created or destroyed

A

Law of conservation of energy

44
Q

A disturbance that carries energy

A

Wave

45
Q

Waves are usually caused by _______.

A

Vibrating objects

46
Q

___________ wave requires a medium

A

Mechanical

47
Q

___________ wave doesn’t require a medium

A

Electromagnetic

48
Q

The time it takes a complete wave oscillation to occur

A

Period

49
Q

of cycles per unit of time

A

Frequency

50
Q

All current MUST go through each part of the circuit; a single pathway

A

Series circuit

51
Q

Must have at least one branch point

A

Parallel circuit

52
Q

FORMULAS

A 
Volume=l x w x h
Density= mass/volume
Speed=distance/time
Force=m x a
Potential energy= mgh
Kinetic energy= m x v2
                            -------
                                2

Wave speed= frequency x wavelength

Finals (3 decks)

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