1. In the heating curve the iron, describe the phase change that occurred between points D and E on the graph? 2. Explain why the temperature stayed constant between points D and E.
3. What is the melting temperature of iron ?
4. What is the freezing point of iron ? How do you know ?
5. What is the boiling temperature of iron?
6. Compare the boiling temperature of iron and water ( water boils at 100°c ). Which substance has stronger intermolecular forces ? How do you know ?

The passing of heat through a material while the material itself stays in place. a. radiation b. conduction c. convection

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.

Which is the most accurate name for the ionic compound cas?