The Sun delivers roughly 1 kW m -2
of power to the
Earth's surface. A parabolic mirror with a 1 m radius is used
to focus this energy onto a beaker containing 1 L of water.
Estimate the time taken by the mirror to raise the temperature of the
water by 50°C, assuming the specific heat capacity of water
to be 4200 J K-kg- and ignoring energy
losses to the surroundings.

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.