Which of the following is not an indication of a chemical change?

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

In the reaction between a crushed antacid tablet and vinegar what gas is emitted

Light waves travel than sound waves.