Which statement describes a chemical change? . 1 alcohol evaporates. 2. water vapor forms snowflakes. 3. table salt is crushed into powder. 4. glucose (c6h12o6) and oxygen produce co2 and h20.

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.

What happens to the temperature of a substance when the average kinetic energy of its particles increases?

Which statement characterizes synthetic polymers? a. they come from animals and plants. b. they are found in nature. c. they are made in a lab. d. they are components of starch.