Which of these is a chemical property of aluminum?Aluminum has a density of 2.70 g · cm−3Aluminum is silvery white in color.Aluminum is highly reactive.Aluminum is a soft metal.
Hydrogen is very reactive with most elements. [___]
chemical
Hydrogen is the least dense of all elements. [___]
physical
Determine which type of property each statement describes by typing “physical” or “chemical” in the blank.
Hydrogen is a colorless, tasteless, and odorless gas.
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. mixing lemonade powder in waterbleaching your hairmowing the lawnlighting a matchletting fruit rot
Which of these is a chemical property of aluminum?
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. mixing lemonade powder in waterbleaching your hairmowing the lawnlighting a matchletting fruit rot
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.
What did you include in your response? Check all that apply.
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