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, 21.06.2019 17:30
Which type of stress results when two plates push against one another? a. compression b. tension c. force d. shear
Answers: 1
Chemistry, 21.06.2019 22:30
Which type of bond is present in hydrogen sulfide (h2s)? the table of electronegativities is given. a. hydrogen b. ionic c. nonpolar covalent d. polar covalent
Answers: 1
Chemistry, 21.06.2019 23:00
City a and city b had two different temperatures on a particular day. on that day, four times the temperature of city a was 8â° c more than 3 times the temperature of city b. the temperature of city a minus twice the temperature of city b was â’3â° c. what was the temperature of city a and city b on that day? city a was 5â° c, and city b was 4â° c. city a was 3â° c, and city b was â’1â° c. city a was 8â° c, and city b was â’3â° c. city a was 5â° c, and city b was â’5â° c.
Answers: 2
Chemistry, 22.06.2019 00:00
Which actions would increase the rate at salt dissolves in water? stir the water? crush the salt? use less water? heat the water? cool the salt
Answers: 3
Astudent conducts an experiment with a steel wool pad, which is comprised of iron. the student washe...
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