Answer:
Here's what I get
Explanation:
(g) Titration curves
I can't draw two curves on the same graph, but I can draw two separate curves for you.
The graph in part (d) had an equivalence point at 20 mL.
In the second titration, the NaOH was twice as concentrated, so the volume to equivalence point would be half as much — 10 mL.
The two titration curves are below.
(h) Evidence of reaction
HCl and NaOH are both colourless.
They don't evolve a gas or form a precipitate when they react.
The student probably noticed that the Erlenmeyer flask warmed up — a sign of a chemical change.
A and B are most closely on the diagram because if you look at A and D is on another side of the diagram than A is. B is on the same side as A. According to “Present time” A B and D are at the top of a arrow but it seems B is a little further down from the arrow if you look closely. This doesn’t change the fact that it’s closer to A.
The soap cannot be expected as a good rust remover, as it lacks the presence of strong acids, or petroleum products, to dissolve the rust.
<h3>What is rusting?</h3>
Rusting is the process of the formation of iron compounds with the reaction of iron with oxygen and water.
The rust can be removed with the acid and petroleum products, as their reaction dissolves the oxygen compounds.
The soap alone cannot be considered a good rust remover, as it lacks the presence of strong acids or petroleum products to dissolve the rust.
Learn more about rusting, here:
brainly.com/question/688285
none of the above. is the answer
Answer:
Mass of hydrogen produced =2.28 g
Explanation:
Given data:
Mass of tin = 67.3 g
Mass of hydrogen produced = ?
Solution:
Chemical equation:
Sn + 2H₂O → SnO₂+ 2H₂
Number of moles of Sn:
Number of moles = mass/ molar mass
Number of moles = 67.3 g/ 118.71 g/mol
Number of moles = 0.57 mol
Now we will compare the moles of tin with hydrogen from balance chemical equation.
Sn : H₂
1 : 2
0.57 : 2×0.57 = 1.14
Mass of hydrogen:
Mass = number of moles ×molar mass
Mass = 1.14 mol × 2 g/mol
Mass = 2.28 g