Atomic structure and the periodic table (1) Flashcards
what is a compound?
A substance that contains two or more elements that are chemically combined.
Who created the periodic table?
Dimitri Mendeleev
What are ions?
An atom that has lost or gained an electron.
What is the subscript when an atom loses an electron?
+
What is the subscript when an atom gains an electron
-
What are reactants?
substances that react together in a chemical reaction
What are the four state symbols?
Solid (S) Liquid (L) Gas (G) Aqueous solution (aq)
What is H20(S)
Ice
What is HCL(G)
Hydrogen Chloride gas
What is the law of the conversation of mass?
No atoms are lost or made during a chemical reaction
N2 + H2 = NH3
Is this a balanced equation?
No
What is a pure substance?
A substance consisting of only one element or compound
What is a mixture?
two or more different substances, not chemically joined together
True or false
the components of a mixture can be separated without chemical reactions
True
What is filtration?
separating an insoluble solid from a liquid
What is crystallisation?