Questions 58 and 59 refer to the following setup:
- Why could you NOT use this setup for preparing H 2 if the generator
contained Zn + vinegar?
(A) Hydrogen would not be produced.
(B) The setup of the generator is improper.
(C) The generator must be heated with a burner.
(D) The delivery tube setup is wrong.
(E) The gas cannot be collected over water.
In a proper laboratory setup for collecting a gas by water displacement,
which of these gases could NOT be collected over H 2 O because of its
solubility?
(A) CO 2
(B) NO
(C) O 2
(D) NH 3
(E) CH 4
What is the approximate percentage of oxygen in the formula mass of
Ca(NO 3 ) 2?
(A) 28
(B) 42
(C) 58
(D) 68
(E) 84
For the following reaction: