Science

Question 1

Scientific method

Answer 1

Question 
Hypothesis
Experiment
Data
Conclusion 
Retest/refine

Question 2

The variable that you decide to change

Answer 2

Independent variable

Question 3

The variable that changes as a result

Answer 3

Dependent

Question 4

The variables that must NOT change

Answer 4

Control variable

Question 5

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

Answer 5

Accuracy

Question 6

The exactness of measurement

Answer 6

Precision

Question 7

Anything that has mass and volume

Answer 7

Matter

Question 8

Taking up space

Answer 8

Volume

Question 9

Same throughout

Ex. Chocolate ice cream & tomato soup

Answer 9

Homogeneous

Question 10

Samples may be different

EX. Rocky road ice cream & chicken noodle soup

Answer 10

Heterogeneous

Question 11

Found on the periodic table

EX. Hydrogen carbon silver

Answer 11

Element

Question 12

Two or more elements put together EX. H2O

Answer 12

Compound

Question 13

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

Answer 13

A. Molecules vibrate but can’t switch places

B. Molecules move over and around each other

C. Move randomly throughout the container

Question 14

How tightly molecules are packed

Answer 14

Density

Question 15

Formula for density

Answer 15

D=mass/volume

Question 16

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

Answer 16

Protons

Question 17

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

Answer 17

Neutrons

Question 18

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

Answer 18

Electron

Question 19

Atoms of the same element with different numbers of neutrons

Answer 19

Isotopes

Question 20

The electrons in the outer energy level

Answer 20

Valence electrons

Question 21

These elements don’t react because they are already stable

Answer 21

Noble gases

Question 22

All elements want ______ valence electrons

Answer 22

8

Question 23

Most atoms are ___________ unless they bond

Answer 23

Unstable

Question 24

2 non-metals; share electrons

Answer 24

Covalent bonds

Question 25

A metal and a non-metal; transfer electrons

Answer 25

Ionic bond

Question 26

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

Answer 26

Ion

Question 27

All compounds have a charge of _______.

Answer 27

0

Question 28

Valence electrons and oxidation

Answer 28

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

Question 29

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

Answer 29

Group

Question 30

Rows on the periodic table; same # of energy levels

Answer 30

Periods

Question 31

Breaking, cutting, melting

Answer 31

Physical change

Question 32

Burning, baking, rusting

Answer 32

Chemical change

Question 33

Uses energy; gets colder

Answer 33

Endothermic

Question 34

Produces energy; gets hotter

Answer 34

Exothermic

Question 35

Speed and direction

Answer 35

Velocity

Question 36

A change in speed or direction

Answer 36

Acceleration

Question 37

An action that has the ability to change motion

Answer 37

Force

Question 38

Objects tend to resist changes in motion

Answer 38

Inertia

Question 39

Equation associated with newtons 2nd law

Answer 39

F=mxa

Question 40

The strength of a objects motion

Answer 40

Momentum

Question 41

Stored energy

Answer 41

Potential

Question 42

Energy in motion

Answer 42

Kinetic

Question 43

Energy can not be created or destroyed

Answer 43

Law of conservation of energy

Question 44

A disturbance that carries energy

Answer 44

Wave

Question 45

Waves are usually caused by _______.

Answer 45

Vibrating objects

Question 46

___________ wave requires a medium

Answer 46

Mechanical

Question 47

___________ wave doesn't require a medium

Answer 47

Electromagnetic

Question 48

The time it takes a complete wave oscillation to occur

Answer 48

Period

Question 49

of cycles per unit of time

Answer 49

Frequency

Question 50

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

Answer 50

Series circuit

Question 51

Must have at least one branch point

Answer 51

Parallel circuit

Question 52

FORMULAS

Answer 52

``` 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