When a substance cannot be reduced by physical or chemical means to a simpler form, it is an example of a(n):

mixture

molecule

element

compound

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a positive ion that releases a proton to water a negative ion that attracts a proton from water a negative ion that releases a proton to water

Express the following number in scientific notation. 0.026890 =

There is a single path for electrons. the current decreases when additional resistors are added. the current will be the same in each resistor. these statements best describe a(n) circuit.