How did Ptolemy's model of the solar system explain the apparent changes in speed and direction of the planets? O The planets spun on epicycles.
O The planets had a significant stellar parallax
O The planets were fixed to nested spheres.
O The planets were attached to crystalline surfaces

Complete this brønsted-lowry reaction placing each product by its appropriate label. hso4- + hcn

14. complete and balance the equations for the single displacement reactions. a. zn + pb(no3)2 -> b. al + niso4 -> 15. complete and balance the equations for the double displacement reactions. a. agno3(aq) + nacl(aq) -> b. mg(no3)2(aq) + koh(aq) -> 16. complete and balance the equations for the combustion reactions. a. __ ch4 + o2 -> b. __ c3h6 + o2 -> c. + o2 ->

One or more substances changing into one or more substances is an example of a