The diagram shows a voltaic cell. The reaction occurs at 1 atmosphere and 298 K. Zn(s) + Pb (aq) Zri (aq) + Pb (s
When the switch is closed, the cell voltage (E) is
1
+0.63 V
2
+0.89 V
3
-0.63 V
4.
-0.89 v

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?