Laws Of Chemical Combinations Flashcards
what does law of conservation of mass say
during any physical or chemical change, the total mass of products remains equal to the total mass of the reactants
or
matter can neither be created nor be destroyed
law of conservation of mass was given by
french chemist Antoine Laurent Lavoisier
when was law of conservation of mass given
in 1789
do nuclear reactions obey the law of conservation of mass? why?
no they don’t because in these reactions some mass is converted into energy according to E = mc^2
law of constant proportions is also known as
law of definite proportions
law of constant proportions was given by
french chemist Joseph Proust
when was law of constant proportions given
1799
what does the law of constant proportions state
irrespective of the source, a chemical compound always contains exactly the same proportion of elements by mass
carbon dioxide can be obtained through various methods such as
burning of carbon
heating limestone
action of dilute hydrochloric acid on marble pieces
during respiration (burning of food)
law of multiple proportions was given by
John Dalton
when was law of multiple proportions given
1803
what does law of multiple proportions state
when two elements combine with each other to form two or more than two compounds, the masses of one of the elements which combine with fixed masses of the other, bear a simple whole number ratio
Gay-Lussac’s law of gaseous volumes was given by
Gay Lussac
law of gaseous volumes was given in
1808
what does law of gaseous volumes state
when gases combine or are produced in a chemical reaction, they do so in a simple ratio by volume provided all gases are at same temperature and pressure
