What is the process in which a nucleus of an atom breaks up, emitting subatomic particles and/or ...

What is the process in which a nucleus of an atom breaks up, emitting subatomic particles and/or energy?
 
  a. radioactive decay
  b. radioactive isotyping
  c. unstable atomic nucleus
  d. electron release
  e. free radical release

Question 2

One hypothesis suggested to explain the uniform age of the surface of Venus is that
 
  a. Venus's surface is 4 billion years old and has not been affected by flooding or slow evolution.
  b. Venus's surface is made of rocks that are much harder than Earth's and thus last longer.
  c. Venus periodically goes through a catastrophic melting of its entire surface.
  d. Venus's clouds protect it from meteorites so that very few impacts occur to change its surface.
  e. dust storms deposit large amount of dust on the surface, making it appear of uniform age.

Question 3

When dissolved in water, a(n) _____ donates H+; a(n) _____accepts H+.
 
  a. acid; base
  b. base; acid
  c. buffer; solute
  d. base; buffer
  e. solvent; solute

Question 4

Most terrestrial planets have portions of their surface that appear to be significantly older than other portions of their surface. What evidence suggests that the surface of Venus is all of the same age?
 
  a. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age.
  b. The craters on Venus are randomly distributed in size and number across the surface.
  c. The volcanoes on Venus are not found in isolated groups, but are scattered around the planet.
  d. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age and the craters on Venus are randomly distributed in size and number across the surface.
  e. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age, all of the rocks were of the same age and the craters on Venus are randomly distributed in size and number across the surface, and the volcanoes on Venus are not found in isolated groups, but are scattered around the planet.

Question 5

The measure of an atom's ability to pull electrons away from another atom is called _____.
 
  a. electronegativity
  b. polarity
  c. charge
  d. concentration
  e. atomic number

Question 6

Besides Earth, which of the terrestrial planets and/or satellites of terrestrial planets show(s) evidence for the possible existence of liquid water flowing on its surface in the past?
 
  a. Venus
  b. the Moon
  c. Phobos
  d. Mars
  e. None of the terrestrial planets or satellites show such evidence.