2nd quiz Flashcards
What are the 3 laws of matter?
- law of conservation mass
- law of definition composition
- law of multiple proportions
Discovered Law of conservation of mass?
Antoine-Laurent de Lavoisier (1743-1794)
the principle that in any closed system subjected to external forces, the mass is constant irrespective of its changes in form.
LAW OF CONSERVATION MASS
matter that cannot be created nor destroyed
LAW OF CONSERVATION MASS
The mass of the substance is equal to the substance after chemical reaction
LAW OF CONSERVATION MASS
WRITE THE EXAMPLE OF LAW OF CONSERVATION MASS
methane + oxygen = 80g
co2+ 2h2o= 80 g
every chemical compound contains FIXED and CONSTANT proportions (by mass) of its constituents elements.
LAW OF DEFINITE COMPOSITION
Chemical compound regardless of its sources and method of preparation form have same composition
LAW OF DEFINITE COMPOSITION
Example of law of definite composition
rain water and purified water =water
who discovered law of definite composition
Joseph Proust (1754-1826)
it is a law of matter where two element combine with each other to form more than one compound
LAW OF MULTIPLE PROPORTIONS
law of matter where the weights of one element that combine with fixed weight of the other are in a ratio of small whole numbers
LAW OF MULTIPLE PROPORTIONS
ratio of the mass of second element that combined with 1g of 1st element can be reduce into small numbers.
LAW OF MULTIPLE PROPORTIONS
WRITE THE EXAMPLE OF LAW OF MULTIPLE PROPORTIONS
WRITE
3 parts of the atom
Neutron
Proton
Electron
charges of the 3 parts of atom
Neutron- neutral charge
Proton- positive charge
Electron- negative charge
T/F: mass number is the total number of protons and neutrons in an atomic nucleus of the atom
TRUE
T/F: The atomic number of a chemical element is the number of protons in the nucleus of the atom
TRUE
Different in the mass # but same element and atomic number
ISOTOPES
Different in elements and atomic number and same in mass #
ISOBARS
Same in neutron
ISOTONES
What are the new elements in periodic table? (5)
Nh- Nihonium
Mc-Moscovium
Lv-Livermonium
Og-Oganesson
Fl-Flerovium
Who invented the first 33 elements in periodic table and differentiate metal to nonmental?
Antoine-Laurent de Lavoisier
Who invented law of Triads?
Johan Dobereiner
atomic mass of middle element is equal to the mean of atomic mass of the 2 elements
LAW OF TRIAD
addition of 1st and 2nd element divided into 2
mean
Invented the law of octaves
John Newlands
States that every 8th element has similar properties when the elements are arranged in the increasing order of their atomic muscle
LAW OF OCTAVES
Father of the modern periodic table
Dmitri Mendeleev
Dmitri Mendeleev arranged the __________
Arranged the table with groups (horizontal 1-7) and raw (vertical 1-18).
Invented the periodic law
Henrey Mosely
Property varies with increasing atomic number
Henrey Mosely
He discovered the transuranic elements
Glenn Seaborg
What is transuranic elements?
-member of actinides
- exhibit radio activity
What is Radio activity
elements produce radiation
Example of elements that exhibit radiation
URANIUM
POLONIUM
THORIUM
What energy needed to remove outermost electron
Ionization Energy
Write the direction of ionization energy
Left to right
bottom to top
the total distance from the nucleus of an atom to the
outermost orbital of its electro
Atomic Radius
Write the direction of Atomic Radius
right to left
top to bottom
Energy given off when neutral atom gain extra electron
Electron Affinity
When neutral atoms extra electron leads to making more negative charge
Electron Affinity
Write the direction of Electron Affinity
Left to right
Bottom to top
If increase electron affinity it means it increase or GAINS the charge is
NEGATIVE CHARGE
If decrease electron affinity it means it decrease or DONATES the charge is
POSITIVE CHARGE
Ability of an atom to attract electron pair to itself, forming
covalent bond
Electronegativity
4 types of subshell and equal to
s-2
p-6
d-10
f-14
