Which of the following is an example of a physical change?
A) Dew forms on a blade of grass.
B) A Halloween light stick glows after shaking.
C) An egg solidifies during cooking.
D) A hydrogen balloon explodes when contacted with a flame.
E) None of the above is a physical change.

Question

Quizplus · Accepted Answer

Dew forming on a blade of grass is a physical change because it is a change in state from gas to liquid, but the substance itself (water) remains the same. Option B is a chemical change as the light stick undergoes a chemical reaction to produce light. Option C is both a physical and chemical change as the eggs undergo a change in state and chemical composition as they cook. Option D is a chemical change as the hydrogen reacts with oxygen in the air to form water and release energy in the form of heat and explosion. Therefore, A is the only option that is a clear example of a physical change.

Which of the Following Is an Example of a Physical