Worth 20 points for each reaction below, write the balanced equation. 1.fes2+o2—> fe2o3+so2 2.ai+o2—> aio2 3.k+br2- -> kbr 4.sio2+hf—> sif4+h2o

Find the protons, electrons and neutrons for strontium with a mass of 83

Which statement describes the appearance of a temperature-vs.-time graph? a horizontal line shows that the temperature increases at a constant rate over time. a vertical line shows that the temperature decreases at a constant rate over time. horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases. horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

For each of the compounds below, show that the charges on the ions add up to zero. a. kbr b. cao c. li(2)o d. cacl(2) e. alcl(3)