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.

B. vertical line shows that the temperature decreases at a constant rate over time.

C. Horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increases.

D. Horizontal lines where the temperature increases are connected by upward-sloping lines where the temperature is constant for each phase.

3. on your graph, the data points between the black squares are data for elements with atomic numbers 3 through 9. locate these elements on your periodic table. what term or description would you use to identify these elements with respect to the periodic table?

Aregular polygon has angkes of size 150° each.how many side has the polygon

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.