Which explanation describes the first part of a chemical reaction? Reactants collide to form products. Products collide to form reactants. Products collide to form a transition state. Reactants collide to form a transition state.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

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(b) which contains higher levels of vitamin b, oranges or spinach?

explanation:

you can eliminate a, c, and d because they are questions based on opinions.