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