Argon gas is heated to 35 °C and then cooled to 10 °C. The gas is then brought back to its original state. Has the gas undergone an enthalpy change? Explain.

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

Which fossil fuel is mainly used for heating and cooking? a. electricity b. coal c. petroleum d. natural gas

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron