When a drain cleaner is mixed with water and the solution becomes warm is that a chemical reaction or no chemical reaction

What can be found in the ionosphere

What metric units would you use to measure the thickness of a key

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.