What can scientists conclude after discovering trilobites? All early organisms were found in the ocean because they needed oxygen.
Most early organisms were smaller in size.
Most early organisms needed sunlight to survive.
All early organisms were carnivores.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Correct relationship between molecular formula and empirical formula

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?