Question 1 of 30 You read a report on a scientific study that does not use double-blind design,
in which neither the researcher nor the patients knew who received the drug
and who received the placebo. What should you be concerned about with
regard to the results of the study?
O A. Ethical violations may have occurred.
B. A conflict of interest might have distorted the results.
C. The study might not have had a large enough sample to be
reliable.
D. The results may have been affected by bias.
SUBMIT

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .

fe 55.85 g/mol and h2o 18.02 g/mol.