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The molecules in the air must encounter electrons to create a spark. This will sometimes happen with no warning, such as when you receive a shock from touching a doorknob.

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What must happen to the temperature of the liquid for vaporization to occur?

The temperature of the liquid must reach its boiling point for vaporization to occur. This is when the liquid molecules have enough energy to overcome the intermolecular forces holding them together and escape into the gas phase.


What must happen for acceleration to occur?

For acceleration to occur, there must be a change in an object's velocity over time. This change can happen by increasing or decreasing the object's speed or by changing its direction of motion. In essence, acceleration is a measure of how much an object's velocity changes per unit of time.


What two things occur for a collision to be effective?

For a collision to be effective, two things must occur: the collision must have enough energy to overcome any energy barriers in the reactants, and the reactant molecules must approach each other with the correct orientation to allow the necessary bonds to form.


For the Doppler effect to occur what must happen?

For the Doppler effect to occur, there must be relative motion between the source of the wave and the observer. As the source moves towards or away from the observer, the frequency of the wave appears to change, causing a shift in the perceived wavelength.


What must happen to cause water to evaporate?

Water must absorb enough heat energy to break the hydrogen bonds holding the water molecules together. This causes the water molecules to overcome intermolecular forces and enter the gaseous state, thus evaporating.