C2.5-2.9 Chemistry 1210 - Atoms

What is group 1A?

alkali metals

What is group 2A?

alkaline earth metals

What is group 6A?

chalcogens

What is group 7A?

halogens

What is group 8A?

noble gases

What elements normally occur as diatomic molecules?

H2, O2, N2, and the halogens

What is a molecular formula?

chem formulas that indicate the actual numbers of atoms in a molecule

What is an empirical formula?

chem formulas that give only the relative number of atoms of each type in a molecule

Ionic compounds make what kind of structure?

crystal lattice

Ionic solids have __________ BP and __________ melting point

high, high

What are alkanes?

compounds of C and H containing only C-C single bonds

What are the formulas for the alkanes methane, ethane, propane?

CH4, C2H6, C3H8

What is an alcohol?

organic compound obtained by replacing an H atom of an alkane w an -OH group

What is the diff b/t 1-propanol and 2-propanol?

1-propanol: replacing H w OH occurred at one of outer C atoms rather than middle C atom
2-propanol: isopropyl alcohol obtained when OH attached to middle C atom

What is an isomer?

compound w same molecular formula but diff structural formulas