Explanation:
As the reaction progresses, less surface area becomes available and, thus, the reaction slows down until eventually there is nothing left to react. Of course, there are ways to increase the reaction rate; namely by adding a catalyst (such as liver).
The question is incomplete, here is the complete question:
A chemistry student needs 75 g of thiophene foran experiment. He has available 0.50 kg of a 29.3% w/w solution of thiophene in carbon tetrachloride.
Calculate the mass of solution the student should use. If there's not enough solution, press the "No solution" button.
<u>Answer:</u> The mass of solution the student should use is 255.97 grams
<u>Explanation:</u>
We are given:
Mass of thiophene needed = 75 gram
29.3 % w/w thiophene solution
This means that 29.3 grams of thiophene is present in 100 grams of solution
Applying unitary method:
If 29.3 grams of thiophene is present in 100 grams of solution
So, 75 grams of thiophene will be present in = 
Given amount of solution = 0.50 kg = 500 grams (Conversion factor: 1 kg = 1000 g)
Hence, the mass of solution the student should use is 255.97 grams
Answer:
<em>a) The variable that we will change will be the different liquids.</em>
<em>b) The variable which will be kept same will be the ramp angle, the time for measuring in each experiment and the heat. </em>
Explanation:
In a scientific experiment, an independent variable is a variable which is changed by the researcher so that its effect on the dependent variable can be studied.
A dependent variable is a variable which is under study and might be influenced by changes in the independent variable.
It is best to study the effect of a single independent variable at a time so that we can easily infer the results.
<u><em>In the scenario discussed in the question, we would change the different liquids so that the time taken by each liquid to flow down the ramp can be studied.</em></u>
<u><em>We will keep the ramp angle, the time (of each experiment) and heat for each of the experiments the same so that a just conclusion can be drawn.</em></u>
The combines law of gas is:
P1 * V1 P2 * V2
---------- = -----------
T1 T2
So, you can obtain many equivalent valid forms depending on the variable that you solve for.
These are some examples:
Solve for T1:
T1 = T2 * (P1 * V1) / (P2 * V2)
Solve for V2:
V2 = V1 * (T2 / T1) * (P1 / P2)
Solve for P1:
P1 = P2 * (T1 / T2) * ( V2 / V1)
The electron configuration of Iron is:
[Ar] 3d⁶4s²
