A chemical change
Explanation:
In this reaction, a chemical change has occurred, here are some indicators of chemical changes from the reaction;
Chemical changes are changes in which new products are formed.
- Formation of bubbles and precipitates: these are new substances that indicates a chemical change. The bubbles and insoluble precipitate are good indicators of chemical change.
- A temperature change that is large; This is also typifies chemical changes. When temperature rises in reaction, a chemical change has occurred.
- The bubbles and precipitates cannot be combined to give the reactants. The reaction is irreversible.
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To Find :
The STP moles of 67.2 L CO.
Solution :
We know, molar volume at STP is used to converted into moles by :
1 moles = 22.4 L STP
So, number of moles in 67.2 L CO is :
Therefore, number of STP moles are 3.
Hence, this is the required solution.
Answer:
[Ar]3d^84s^2
Explanation:
From the question given, we are asked to write the condensed form of electronic configuration of nickel, Ni.
To do this, we simply write the symbol of the noble gas element before Ni in a squared bracket followed by the remaining electrons to make up the atomic number of Ni.
This is illustrated below:
The atomic number of Ni is 28.
The noble gas before Ni is Argon, Ar.
Therefore, the condensed electronic configuration of Ni is written as:
Ni(28) => [Ar]3d^84s^2
Answer:
B. Reduction occurs at the cathode.
Step-by-step explanation:
That's the <em>definition</em>: The cathode is the electrode at which reduction occurs.
A is <em>wrong</em>. The cathode gains electrons through the external circuit.
C is <em>wrong</em>. The cathode has the electrons, so cations move toward it.
D is <em>wrong</em>. Reduction occurs at the cathode, so the oxidation number decreases.
Answer:
20 different kinds of minerals make up 95% of earth's rocks.
<u><em> I hope this helps... please correct me if i'm wrong</em></u>
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