Plants need light to grow. No duh! Specifically, plants need a certain number of photons of specific wavelengths from the blue and red end of the spectrum to take apart water and carbon dioxide molecules to make more plant. The middle bit is reflected back and so plants look green.
To answer this, we must go back and ask, why to atoms form molecules? The answer is, they all wish they were noble gases! Noble gases have their outer, or valence, electron shells completely full, which makes them so perfect, they don't need to interact with anything.
Kinematics is all about motion. Motion is a change in position relative to a frame of reference
scalar vs vector distance vs displacement speed vs velocity frame of reference acceleration
Vectors can be manipulated in two ways, by trigonometry or on a Cartesian coordinate system
$$d = v_it + \frac{1}{2}at^2$$ $$v_f^2 = v_i^2 + 2ad$$ $$v_f = v_i + at$$ $$d = \frac{v_i + v_f}{2}t$$
This physics course deals extensively with vectors. If you haven't already taken, or are not currently taking Calculus, you're in big trouble.
Momentum and Impulse Worksheet
Newton's Second Law worksheet
Mr. Guch's Cavalcade o' Teaching - basic procedures, atomic structure, periodic tables, etc.
about.com - more balancing equations practice sheets
Chem4Kids - Atom Basics
Atomic Structure - introduction to periodic table is good, the rest is best left for university
Wisc-Online Acid-Base Reactions
The Second Law of Thermodynamics, Evolution, and Probability
Short version
Doc Brown's Chemistry A LEVEL QUIZZES and WORKSHEETS Interactive quizes
Organic Chemistry course includeing worksheets and answer keys
Honors Chemistry a complete course with lecture notes, worksheets and quizes
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