Which laboratory activity involves a chemical change?
Which event always involves a chemical change?
Jenna took an open bowl of leftover mashed potatoes from the refrigerator and noticed a difference in smell. She determined that chemical changes occurred since the potatoes were first placed there.
Which characteristic of a substance is considered a chemical property?
Which statement best describes chemical properties of matter?
In a science demonstration, a teacher mixed zinc (Zn) with hydrogen chloride (HCl) in a flask and quickly attached a balloon over the mouth of the flask. Bubbles formed in the solution and the balloon inflated.
What is the outcome of all chemical changes when two substances are combined?
Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he placed the cup outside for several sunny days during the summer. After a week, he observed that only solid salt remained in the cup and the mass had decreased. Henry concluded that a physical and chemical change occurred in this investigation.
Which statement describes all chemical changes, but not all physical changes?
Which statement best describes a physical change?
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