elements
subatomic particles
a particle smaller than an atom or a cluster of such particles
What is the mass number of an atom?
The mass number (A) of an atom is the total protons (p) and neutrons (n) present in a nucleus.
potassium
KCI
Moles to Grams Conversion Formula?
In order to convert the moles of a substance to grams, you will need to multiply the mole value of the substance by its molar mass.
What are the 3 states of matter?
solid, liquid, and gas
atomic number
The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
What group are noble gases?
Group 8A
fluorine
F2
To convert from moles to atoms,
Multiply the molar amount by Avogadro's number. To convert from atoms to moles, divide the atom amount by Avogadro's number
Can matter be created?
Matter can be created and destroyed. In fact, matter is created and destroyed all the time. There is no one definition of matter but we can loosely define it as "anything composed of particles", including the particles themselves.
mass number
The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom or to the average number allowing for the relative abundances of different isotopes.
What are group trends?
Group Trend: as you go down a column, atomic radius increases. Periodic Trend: as you go across a period, atomic radius decreases. Ionization Energy Trends. Group Trend: as you go down a column, ionization energy decreases. Periodic Trend: as you go across a period, ionization energy increases.
magnesium
Mg
Stoichiometry?
The relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers.
rigid - particles locked into place
solid
Isotopes
Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
What are the 3 periodic trends?
Major periodic trends include: electronegativity , ionization energy , electron affinity , atomic radius , melting point, and metallic character
carbon dioxide
CO2
What is law conservation of mass?
The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. Thus, the amount of matter cannot change.
particles can move/slide past one another
liquid
Atomic mass
The mass of an atom of a chemical element expressed in atomic mass units. It is approximately equivalent to the number of protons and neutrons in the atom or to the average number allowing for the relative abundances of different isotopes.
What are the properties of elements?
These properties include color, density, melting point, boiling point, and thermal and electrical conductivity
Calcium, Potassium , hydrogen
(Ca2+), (K+), (H+)
How do you calculate stoichiometry?
1. Balance the equation.
2. Convert units of a given substance to moles.
3. Using the mole ratio, calculate the moles of substance yielded by the reaction.
4. Convert moles of wanted substance to desired units.
particles can move past one another
gas