The circumstances when scientists use observational research and opinion based research is when they include animals or things that cannot control for a product. Observational research is a type of research which only observes ongoing behavior and studies about it and the results only rely on the behavior observed.
In setting up your equipment in front of the fume hood to eliminate
any vapors during the experiment. Use an iron ring stand with iron ring to back
up the clay triangle to clasp the crucible and lid. Alter the height of the
iron ring so the end of the crucible is about one centimeter above the inner
blue cone of the strong flame.
Precipitation, evaporation, condensation
Answer and Explanation:
The galvanic cell is:
Cu(s)| Cu²⁺(aq)|| Cu⁺(aq)| Cu(s)
The first two species before the double bar (||) constitute the <em>anodic half reaction (oxidation)</em>:
Cu(s) ⇒ Cu²⁺(aq) + 2 e-
The two species after the || constitute the <em>cathodic half reaction</em><em> </em><em>(reduction</em>):
Cu⁺(aq) + e- ⇒ Cu(s)
If we multiply the reduction half reaction by 2 (to obtain the same number of electrons than oxidation reaction) and then we add the two half reactions, we obtan the balanced equation:
Reduction (cathode) : 2Cu⁺(aq) +2 e- ⇒ 2Cu(s)
Oxidation (anode) : Cu(s) ⇒ Cu²⁺(aq) + 2 e-
------------------------------------
Total equation: 2Cu⁺(aq) + <em>Cu(s)</em> ⇒ <em>2Cu(s)</em> + Cu²⁺(aq)
Cu(s) is in both reactants side and products side, so we cancel that in both opposite sides to obtain:
2Cu⁺(aq) ⇒ Cu(s)<em> </em>+ Cu²⁺(aq)
If we divide the balanced equation into 2, the smallest possible integer coefficient for Cu⁺(aq) is 1:
Cu⁺(aq) ⇒ 1/2 Cu(s)<em> </em>+ 1/2 Cu²⁺(aq)
Hi,
The answer should be letter C.
Hope this helps!