Answer:
D) Evaluating it with experimentation and argument.
Explanation:
If you don't have enough observational evidence, then you can't really strengthen your scientific knowledge, because you haven't collected enough information to answer the questions you're asking.
If you only have a few scientists working on a question, it will take longer to find an answer. With more people working on a concept, it can be solved in more time.
It can be good to create new hypotheses, but only if you've already tested your original hypothesis (with experimentation and argument), and it turned out to be wrong. Once you've rejected your first hypothesis, only then should you make a new one.
Using the method chromatography
<h2>Answer:</h2>
The<u> diffusion </u>occurs in room.
- <u>Oder molecules move from their highest concentration to lowest concentration.</u>
<h3>Explanation:</h3>
Diffusion is a process by which molecules move down their concentration gradient. The process does not require any membrane.
So corner with perfume has high concentration of odor molecules. Hence they move to other corner with low concentration of molecules.
Answer: A volume of 1.16 L hydrogen is produced at a pressure of 2 atm and a temperature of 298 K.
Explanation:
Given: Mass of Mg = 2.3 g
Pressure = 2 atm
Temperature = 298 K
The reaction equation is as follows.
This shows that 1 mole of Mg gives 1 mole of 
.
Hence, moles of Mg for the given mass is calculated as follows.
Hence, 0.095 moles of Mg will give 0.095 moles of .
Formula used to calculate volume is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into the above formula as follows.
Thus, we can conclude that a volume of 1.16 L hydrogen is produced at a pressure of 2 atm and a temperature of 298 K.
