Sec. Schoology
TUSSIDLC PUNTS.
A student obtains two strips of magnesium, Mg, ribbon that are each 3 cm long. One strip of magnesium is placed in a test tube
containing 5 mL of water, and the other strip is placed in a test tube containing 5 mL of hydrochloric acid, HCI. Both liquids are
at room temperature. The student's observations are recorded in the table.
Test Tube 1
Test Tube 2
Magnesium in Water
Magnesium in HCI
No observable activity takes place. Bubbling occurs on the surface of
the magnesium
The temperature of the water The temperature of the liquid
remains constant.
increases
A litmatch placed near the mouth A litmatch placed near the mouth
of the test tube continues to burn. of the test tube makes a popping
sound and goes out.
The appearance of the metal does The metal strip gradually becomes
not change.
smaller until nothing is left except
for a dear liquid
Which statement is NOT supported by the student's observations?
A chemical reaction takes place between magnesium and hydrochloric acid.
Energy is released in the reaction involving hydrochloric acid.
A gas is released in Test Tube 2.
The substances in both test tubes are reactive only at high temperatures.