Based on the spectrums in the figure, rank the four galaxies in order of the speed with
which they are moving away from Earth, from slowest (1) to fastest (4).
Rank (1 = slowest, 4 = fastest)
Galaxy A
Galaxy B
Galaxy C
Galaxy D

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

What are the trends and exceptions to the trends in electron affinity?

Which of the following statements is true? a. most heat energy is easily recovered and used for useful actions. b. friction causes molecules to vibrate more slowly. burning air and gasoline in an c. engine changes chemical energy into mechanical energy. it is impossible to d. change mechanical energy into mechanical energy.