Which of the following statements is true of ions?

a. positive ions are from gaining electrons

b. negative ions are from gaining electrons

c. positive ions are from gaining protons

d. negative ions are gaining protons

Which of these is an intensive property of a substance

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.

Which of the following has expanded our knowledge of the universe beyond our solar system the most? a. manned space travel b. the hubble space telescope c. the pioneer and voyager missions d. the international space station