Chaper 1 Flashcards
What did Boyle contribute to chemistry?
The idea that an element was a pure substance and compounds were made from elements.
What did Lavoisier contribute to chemistry?
Law of conservation of mass - the mass of the reactants is the same as that of the products. Matter was not destroyed in chemical reactions.
What did Dalton contribute to chemistry?
Proposed that all matter was made of atoms that were specific to each element and chemical reactions involve rearrangement of these atoms.
The periodic table…
…organises elements according to their chemical and physical properties.
What did Mendeleev contribute to chemistry?
He arranged the elements in order of increasing atomic weight, noting that properties varied periodically with atomic weight. Left gaps for undiscovered elements.
What is an atom?
The smallest part of an element that can take part in a chemical reaction.
What is the law of conservation of mass?
During a chemical reaction the total mass of the reactants is equal to the total mass of the products.
What is an element?
A substance composed of atoms with the same atomic number.
In chemistry, what is a group?
A vertical column of elements in the periodic table.
In chemistry, what is a period?
A horizontal row of elements in the periodic table.
