150 Facts for Physical Science
25
A chemical change alters the chemical make up of the substance
24
A physical change does not alter the chemical make up of a substance
16
A solution is when one substance dissolves into another
20
A suspension is a heterogeneous mixture that settles over time
30
Bohr proposed the theory that electrons move in "orbits" around the nucleus
12
Boyle's law states that as the perrsure of gas increases, its volume decreases
7
Deposition is the physical change of a gas directly to a solid
9
During an endothermic change, energy is absorbed from the surroundings
10
During an exothermic change, energy is given off into the surroundings
45
Isotopes are atoms of the same element with a different number of neutrons
4
Plasma is the highest energy phase of matter
3
Solid is the lowest energy phase of matter
6
Sublimation is the physical change of a solid directly to a gas
28
Thomson provided the first evidence that there are negatively charged subatomic particles
31
Three main parts of the atom are the proton, neutron, and electron
49
Valence electrons are the elctrons in the outermost energy level of the atom
5
Vaporization is when a substance changes from liquid to a gas
22
Viscosity, conductivity, malleability, hardness, density, melting and boiling points are physical properties of matter
36
protons and neutrons have a mass of 1 amu
2
The 4 phases of matter are solid, liquid, gas, and plasma
8
The Kinetic Theory of matter states that all particles of matter are in constant motion
50
The alkali metals are the most reactive elements in the Perioidic Table
47
The atomic number is equal tot eh number of protons in the nucleus of an atom
46
The modern Periodic Table organizes atoms by increasing atomic number
17
The two types of mixtures are heterogeneous and homogeneous
21
A colloid is a heterogeneous mixture that never settles
37
An amu stands for atomic mass unit
42
Atoms are made up of mostly empty space
26
Atoms are the building blocks of matter
43
Atoms that are the same make up elements
27
Dalton proposed the theory that all matter is made up of individual particles called atoms, which cannot be divided
13
Charles's law states that as the temp. of a gas increases its volume increases
14
Compounds always contain two or mroe elements joined in a fixed proportion
41
Electrons are found around the nucleus
38
Electrons have a mass of approximately 1/2000 of an amu
32
Electrons have a negative charge
39
Electrons move from one energy level to another when an atom gains or loses energy
44
Elements have a fixed composition,containing only one type of atom
48
Elements in the Periodic Table are classified as metals, nonmetals, and metalloids
23
Flammability and reactivity are chemical properties of matter
19
Heterogeneous mixtures appear different throughout
18
Homogeneous mixtues appear the same throughout
1
Matter is what makes up the physical universe
15
Mixtures are two or more substances physically combined
34
Neutrons have no charge
11
Pressure is the result of a force distributed over an area
40
Protons and neturons are found in the nucleus of the atom
33
Protons have a positive charge
35
Quarks make up protons and neturons
29
Rutherford discovered that the nucleus is positvely charged, extremely small, and is in the center of the atom