Final answer:
Sound will speed up when it travels from carbon dioxide to ethanol because sound waves travel faster in denser materials.
Step-by-step explanation:
When sound travels from carbon dioxide to ethanol, the speed of sound will increase.
This is because the speed of sound depends on the density of the medium it is traveling through. Sound waves travel faster in denser materials.
Since carbon dioxide is a gas and ethanol is a liquid, the density of ethanol is higher than that of carbon dioxide. Therefore, when sound travels from carbon dioxide to ethanol, it will speed up.