2 Wood e
Nean X M Inbox
usatestprep. com/modules/combined/ca. php?testid=1741&strand-8692& ;id=BM2197410&assignment_id:416 54411.
Copper No reaction even when gently heated
Little initial reaction
More vigorous reaction when heated
Iron
Positive test for hydrogen gas
Solution turned from colorless to yellow
Vigorous initial reaction; rapid evolution of gas.
Positive test for hydrogen gas.
Magnesium
All of the magnesium seemed to disappear
Solution remained colorless.
Initial reaction produced rapid evolution of gas; less vigorous than magnesium
Zinc All of the zinc seemed to disappear.
Solution remained colorless.
Formulas
Students in Ms. Brown demonstrated several chemical reactions but the data did not represent the law of conservation
of matter in any of the four experiments. Kai and Maria are about to add 3 grams of magnesium (Mg) to a test tube of
30 grams of hydrochloric acid (HCI). They covered their container with a balloon as a seal. If the girls expect a
chemical change as well as evidence of the law of conservation of matter, choose ALL of the predictions that are
appropriate?
6)
A)
There will be a rapid evolution of gas. ,
B)
The mass of the products will equal 339.
O
The solid magnesium metal will disappear.
D)
The balloon covering the container will expand.
E
There will be a dramatic change in temperature,
O
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