An investor paid market price for a chunk of gold that he was told was pure. The gold bar had a mass of 440 g, but was slightly irregular so an exact volume could not be calculated. The investor filled a large graduated cylinder with water, immersed the chunk of gold, and observed an increase in the apparent volume of material in the graduated cylinder of 25.0 ml. Pure gold has a density of 19.3 g/cm 3 . Did the investor get his money's worth? Why or why not?

No. the investor didn't get his money worth gold.

Explanation:

Density of pure gold = 19.3 g/cm³

Mass of gold bar = 440 g

volume replaced by gold bar = 25 ml

Now we have to find the volume of the gold bar using its mass and volume as,

Volume = Mass/ density = 440 g / 19.3 g/cm³

                                      = 22.79 ≈ 23 ml

So the investor didn't get his money worth gold.

there are videos on you tube if you wanna check them out

Explanation:  

The temperature of lava is so high that the moment it comes in contact with ice, it converts the latter directly into vapor, without turning it into water first. This steam essentially tries to escape through the lava.