Which of the following statements is true? a transverse waves move particles parallel to the direction of energy. b longitudinal waves move particles at right angles to the direction of energy. c transverse waves usually occur in solids, while longitudinal waves occur in liquids and gases. d all of the above

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

answer: they produce more slow than unicellular organisms.