1.
anything that takes up space and has mass
2.
all particles in matter are identical (fixed composition)
3.
simplest form of matter from which more complex substances are made (listed on the PT)
4.
two or more atoms chemically bonded to one another in a fixed proportion
5.
two or more substances physically mixed together
6.
components are evenly distributed out on a microscopic level; aka: Solution
7.
substances are not evenly spread out
8.
properties that can be observed directly or measured with a tool without changing the chemical make-up of the substance
9.
The mass of a substance per unit volume
10.
a change that affects only the physical properties of matter
11.
properties that can only be observed by changing the chemical makeup of the substance New substance is formed
12.
a change that affects the actual substance. Something new is formed
13.
matter is neither created nor destroyed during a chemical change
14.
the total energy (KE & PE) of a material’s particles
16.
average kinetic energy of the particles of matter or how fast the particles are moving
17.
the maximum amount of solute that can dissolve in a certain amount of solvent at a specified temperature. OR a substances ability to dissolve
18.
number of protons in an atom; identifies the element; periodic table is arranged by this number
19.
number of protons & neutrons in an atom
20.
atoms of the same element with different numbers of neutrons
21.
Weighted average of all the isotopes of a particular element; number shown on periodic table; it is closest to the mass number of the most common isotope for the element
22.
vertical columns on the periodic table that indicate the number of valence electrons an atom has
23.
horizontal rows on the periodic table that indicate the number of energy levels an atom has in its electron cloud
24.
tells what elements and how many of each element are in a unit of that compound
25.
force that holds atoms together in a compound
26.
charged atom that has gained or lost electrons (atoms that lose electrons are positively charged and called cations; atoms that gain electrons are negatively charged and called anions)
28.
metals that lose electrons and become positively charged
29.
nonmetals that gain electrons and become negatively charged
30.
compound formed when 2 or more elements bond covalently.
32.
substances that are formed
33.
an insoluble compound that comes out of solution
34.
Chemical reactions that release energy
35.
chemical reactions that release energy as heat
36.
Chemical reactions that absorb energy
37.
chemical reactions that absorb energy as heat
38.
substance that speeds a reaction up without being permanently changed by lowering the activation energy
