Which best describes the transition from gas to liquid?

a) energy must be removed because particles in liquid move more slowly.

b) energy must be added because particles in liquid move more quickly.

c) energy is neither added nor removed in this phase transition.

d) energy is either removed or added, depending on the type of particles.

a) the kinetic energy decreases as in a gas, the particles are widespread and move freely but in a liquid, their movement is more limited

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance