Chemistry, 28.10.2019 00:43 princessroseee769
Which laboratory activities involve chemical changes? check all that apply.
a)leaving a copper penny in vinegar until it turns green
b)boiling saltwater for several minutes until only solid salt remains
c)extracting iron filings from a sand mixture using a magnet
d)crushing a rock with a hammer to extract mineral deposits
e)putting an iron nail outside for a month and observing changes
Answers: 2
Chemistry, 22.06.2019 00:00
Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.
Answers: 1
Chemistry, 22.06.2019 03:30
At a temperature of 393 k, the temperature of a sample of nitrogen is 1.07 atm what will the pressure be at a temperature of 478 k
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Chemistry, 22.06.2019 12:00
Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~
Answers: 1
Which laboratory activities involve chemical changes? check all that apply.
a)leaving a...
a)leaving a...
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