Which of the following is an example of matter undergoing only a physical change?
A) Carbon (solid) being burnt in air to form carbon dioxide (a gas)
B) Hydrogen (gas) forming water with oxygen (gas)
C) Water (liquid) forming steam (gas) after being heated
D) Chlorine (gas) forming Hydrogen Chloride (liquid) when mixed with water
E) Sodium (solid) forming sodium hydroxide (aqueous) when mixed with water.

Question

Quizplus · Accepted Answer

The physical change is the change in state from liquid to gas due to heating, which does not result in a change in the chemical identity of the substance. The other answer choices involve chemical reactions where the identity of the substance is altered.

Which of the Following Is an Example of Matter Undergoing