What is the main cause of any change of state?

Change of state is caused by supply of heat to a substance causing its molecules to move faster.

There are three states of matter, these are;

It is possible for a substance to be transformed from one state of matter to the other when heat energy is supplied to the substance.

This heat energy causes the kinetic energy of the molecules of the substance to increase hence they vibrate faster and change from one physical state to another.

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During a change in state, the motion of the particles changes. ... Particles in a liquid can side past each other, but particles in a solid can only move enough to vibrate. Removing energy from a liquid can cause it to change to a solid. Adding energy to a solid can cause it to change to a liquid.

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answer; i do believe the correct answer is (river); /// good luck

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g