672cm x 11cm / 6.3cm^3
2 answers:
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Answer:
a. The student performed the splint test incorrectly. He should of observed a popping sound when the splint was placed in the test tube.
Explanation:
It is given that a student performed an experiment where he dropped a nickel metal in to HCl solution. He observed the reaction and performed a splint test in the test tube that is filled with a gas which is formed while Nickle is dropped into the solution of HCl.
But the experiment that the student performed was incorrect. He must have observed the popping sound when the splint was placed in the test tube.
When the splint was added to the gas splint flared up. The hydrogen gas pops out when exposed to the flame.
Thus the correct option is (a).
Explanation:
The reaction between calcium hydroxide and nitric acid is as follows.
Number of reactant atoms are as follows.
- Ca = 1
- O = 4
- H = 3
- N = 1
Number of product atoms are as follows.
- Ca = 1
- O = 4
- H = 2
- N = 3
To balance the given chemical equation, multiply by 2 on reactant side and multiply
by 2 on the product side.
Therefore, the balanced chemical equation will be as follows.