Which of these is a chemical property of aluminum?
What did you include in your response? Check all that apply.
Determine which type of property each statement describes by typing “physical” or “chemical” in the blank.
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Which of these are physical changes in matter? Check all that apply.boiling watera pencil being sharpenedexploding dynamitefreezing waterrotting cheese
Which of these are chemical changes in matter? Check all that apply.
Read the article Looking at Leaves and answer the question.What causes leaves to change color in the autumn? Is the change physical or chemical? Explain your answer.
Leaves change color because of the presence of different pigments: chlorophyll (green), carotenoid (yellow/orange), and anthocyanin (red). In autumn, trees stop producing chlorophyll due to less sunlight, which allows the other pigments to become visible. This is a chemical change because the chemical composition of the leaf is changing as chlorophyll breaks down and new pigments like anthocyanin are produced.
Determine which type of property each statement describes by typing “physical” or “chemical” in the blank. Hydrogen is a colorless, tasteless, and odorless gas. Hydrogen is very combustible in the presence of oxygen. Hydrogen is very reactive with most elements. Hydrogen is the least dense of all elements.
You are comparing a reaction that produces a chemical change and one that produces a physical change. What evidence could you use to determine which type of change is occurring?
If the reaction is a chemical change, new substances with different properties and identities are formed. This may be indicated by the production of an odor, a change in color or energy, or the formation of a solid.
What did you discuss in your response? Check all that apply.
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