Why do we need to use ray boxes and paper when we investigate light?

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

Which fact represents evidence for the big bang theory?

Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.