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Hydrogen ion reacts with zinc to produce
gas
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The plants without any fertiliser could be the control, to see what the change in the independent variable (fertiliser) does to the growth of the plant (dependant variable).
Hope that helps.
The ball and stick model of C subscript 2 H subscript 4 is described as Option C: Each C has 2 H's connected to it each by 1 black.
This means the same as the 3D structure image of ethylene (C2H4) and means 2 C's connected by 2 black lines.
line.
The structure of ethylene is made up of 2 carbon atoms and 4 hydrogen atoms.
The carbon atoms are located at the middle position and the hydrogen atom surrounding the carbon atoms with two hydrogen atoms connected to each carbon atom. The two black lines connecting the carbons are the double bonds.
Learn more: brainly.com/question/23375084