1(False)
2(True)
3(False)
4(True)
5(True)
6(True)
Answer:
After 15minutes, the water in test tube with the exposed Elodea plant will become colourless. While the solution with the wrapped Elodea plant will remain slightly yellow as it is.
Explanation:
The carbon dioxide introduced into each tube will lead to development of yellow coloration in the solutions. The exposed plant will use up more carbondioxide from the ones introduced in it's solution during the process of photosynthesis. This will disapprove the hypothesis formulated by the student, thereby returning the pH if the solution to it's neutral state. This will reverse the color to colourless nature of the distilled water. While the wrapped Elodea plant will not be able to use the available carbondioxide, therefore the solution will remain slightly acidic and the yellow color will remain.
Answer:
hi
Explanation:
The mass of the actual tin will remain constant; however I assume you are comparing the mass of the reactant, tin, with the mass of the products. The increase in mass stems from the oxides of tin present due to its reaction with oxygen in the air:
Sn(s) + O2(g) → SnO2(s)
By working out the atomic mass of the tin and the relative formula mass of tin oxide, you can see why there is a mass increase; 119:151. As you can see here, for every 119g of tin reacted, there will be 151g of tin oxide, hence why you think the mass of the tin increased (by 32g).
Hope this helped!
The +1 is a charge, but really + means minus, and - means addition.