It should be the answer b but I’m not to sure
Answer:
I think it's B " Constraints are more important than criteria ".
A law is statement about an observed concept. A theory involves the explanation of scientific concepts or principles. A hypothesis is the predicted explanation about some concepts that has to be tested in order to prove it to be right. An observation is the observing the results of a scientific experiment carried out to test an hypothesis.
Here the given statement 'A chemist mixes sodium with water and witnesses a violent reaction between the metal and water,' can be classified as an observation as it explains what the chemists observes as a result of his chemical experiment or test..
The correct answer is D.
Increasing the pressure shifts the position of equilibrium towards the side with fewer gas molecules.