Sodium metal reacts with water to produce hydrogen gas. What best describes this reaction? (2 points)
A combustion reaction takes place.
O A double replacement reaction takes place.
O A synthesis reaction takes place.
O A single replacement reaction takes place.

Which one of the following gases is not an important component of soil?

The biosphere of the earth is made up of what compound? organic or inorganic?

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.