Question
Which statement is true?
An object melts as the particles slow down.
Particles move faster when they melt than when they evaporate.
Particles in an object move faster at 50°C than at 20°C.
Particles speed up when an object solidifies.
An object melts as the particles slow down.
Particles move faster when they melt than when they evaporate.
Particles in an object move faster at 50°C than at 20°C.
Particles speed up when an object solidifies.
Answers
Answer
Which of the following will NOT happen when a liquid undergoes a physical change?
The kinetic energy of the molecules increases.
The motion of the molecules will decrease.
The molecules become more closely packed.
The molecules will rearrange to form new chemical bonds.
The kinetic energy of the molecules increases.
The motion of the molecules will decrease.
The molecules become more closely packed.
The molecules will rearrange to form new chemical bonds.
Answer
Joe watches a candle burn. What chemical change does he observe?
The candle wax changes shape.
The candle wax turns liquid as it burns.
The heat melts the candle wax.
Heat and light are produced.
The candle wax changes shape.
The candle wax turns liquid as it burns.
The heat melts the candle wax.
Heat and light are produced.
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