What is the value of a compound and a mixture

Name the element in group 17, period 2. (periodic table)

If two objects at different te,peraure are in contact with each other what happens to their temperature

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.