A 100-g sample of a certain substance undergoes a transformation of some kind that releases 20,000 J of energy. What kind of transformation is this likely to be?

A. A temperature change
B. A phase change
C. A chemical reaction
D. A nuclear reaction
E. It is impossible to guess.


B. A phase change

Physics & Space Science

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If the electric potential in a region is given by V(x) = 6/x2, the x component of the electric field in that region is

A) -12x-3. B) -6x. C) 12x-3. D) 12x. E) 6x.

Physics & Space Science

The Atacama Large Millimeter Array achieves exceptional resolution by using exceptionally:

A) large radio antennas in a fixed array. B) large radio antennas in a mobile array. C) many radio antennas in a fixed array. D) many radio antennas in a mobile array. E) many portions of the electromagnetic spectrum.

Physics & Space Science

In the process of crystallization, the remaining magma becomes _______.

What will be an ideal response?

Physics & Space Science

Most ______________ do their jobs by decreasing the activation energy for a reaction

Fill in the blank(s) with correct word

Physics & Space Science