Multiple ChoiceWhich of the following best explains why the melting of ice is not considered a chemical change?70views
Multiple ChoiceWhich observation best indicates that a change is a physical change rather than a chemical change?59views
Multiple ChoiceWhen water evaporates, which of the following best describes the change that occurs?51views
Multiple ChoiceA mixture of iron filings and sulfur can easily be separated by which of the following methods?63views
Multiple ChoiceWhich type of change occurs when molten gallium solidifies to Ga(s) at its normal melting point?41views
Multiple ChoiceWhich of the following best describes what happens as matter changes state from gas to liquid?42views
Open QuestionWhich process is a chemical change? Is it burning a match, boiling water, melting ice, or breaking glass?688views1rank
Multiple ChoiceWhich of the following statements about the changes food undergoes during cooking is correct?197views
Multiple ChoiceWhen wood burns in a campfire, is this process best classified as a physical change or a chemical change?65views
Multiple ChoiceWhy is it sometimes difficult to determine whether an observed change is physical or chemical?43views