Consider the following intermediate chemical equations C(s) + O2(g) – CO(9)
CO(g) + O2(g) – CO,(0)
How will oxygen appear in the final chemical equation?
O 02(9) as a product
O O2(g) as a reactant
O O(g) as a product
O 20(9) as a reactant

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.

Which statement describes how phase changes can be diagrammed as a substance is heated? the phase is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the phase is on the x-axis. the time is on the y-axis and the temperature is on the x-axis. the temperature is on the y-axis and the time is on the x-axis.

Iknow #2 is d. i just need to know why