C3: Chemical Economics Flashcards
Learn all about Chemical Economics!
What is an element?
An element is a substance made up of just 1 type of atom. Each element is represented by a different chemical symbol. Example: Fe represents iron and Na represents sodium.
What is a compound?
Compounds are substances formed from the atoms of 2 or more elements, which have been joined together by 1 or more chemical bonds. Example: H2O, CaCO3 and C6H12O6.
What are Ions?
They are atoms or small molecules that have a charge. Example: Na+, Cl-, NH4+ and SO42-.
What makes an Positive Ion?
When an atom loses electrons.
What makes a Negative Ion?
When an atom gains electrons.
What are Covalent bonds?
When 2 atoms share a pair of electrons. (The atoms in molecules are held together by covalent bonds.)
What are Ionic bonds?
They are formed when atoms lose or gain electrons to become charged ions; the positive ions attract the negative ions.
Study the periodic table. *NOT A QUESTION*
What is a formulae and what do they show?
Chemical symbols are used with numbers to write formulae that represent the composition of compounds.
Formulae are used to show the different elements in a compount, the number of atoms of each element in the compound and the total number of atoms in the compound.
How do rates of reactions work in different temperatures?
Lower Temperature means lower rate and higher tempertaure means higher rate.
How do rates of reactions work in different concentrations?
The lower concentration, the lower the reaction rate. Whereas the higher the concentration, the higher the reaction rate.
How do rates of reactions work in gas pressures?
Lower pressure means lower rate and higher pressure means higher rate.
