question 21\nwhich of the following is an example of a physical change?\ngrinding coffee beans\nbaking a…

question 21\nwhich of the following is an example of a physical change?\ngrinding coffee beans\nbaking a cake\nconverting water to hydrogen and oxygen\nburning coal

question 21\nwhich of the following is an example of a physical change?\ngrinding coffee beans\nbaking a cake\nconverting water to hydrogen and oxygen\nburning coal

Answer

Brief Explanations:

A physical change alters the form or appearance of a substance without changing its chemical composition. Grinding coffee beans only changes their physical form from whole beans to powder. Baking a cake involves chemical reactions between ingredients. Converting water to hydrogen and oxygen is a chemical decomposition reaction. Burning coal is a combustion reaction, a chemical change.

Answer:

grinding coffee beans