Chemistry, 10.07.2019 18:30 valeriekbueno
Astudent conducts an experiment with a steel wool pad, which is comprised of iron. the student washes the steel wool in vinegar and then leaves the wool out in the open air for 15 minutes. the student notices that the wool is changing color (turning brownish-orange) and when the student touches the steel wool, it feels warm to the touch. which of the follow changes occured during this experiment? a. a physical changed occured and energy was given off b. a chemical change occured and energy was given off c. a chemical change occured and energy was absorbed. d. a physical change occured and energy was absorbed
Answers: 1
Chemistry, 22.06.2019 22:30
Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.
Answers: 2
Chemistry, 22.06.2019 23:00
What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?
Answers: 1
Astudent conducts an experiment with a steel wool pad, which is comprised of iron. the student washe...
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