Explanation

polarimeter detects whether one or both enantiomers are present in a sample.

It consists of:

a light source

a polarizer

a sample cell

a detector

an analyzer.

Explanation

The copper Test measures the amount of ceruloplasmin in our blood.

Ceruloplasmin is a protein that stores and carries copper into your bloodstream.

Explanation

Otto Von Bismarck, a German diplomat, masterminded the unification of Germany in 1871 and

served as the first Chancellor of the German Empire until 1890.

Explanation

Incorrect:  I looked at me in the mirror

Correct: I looked at myself in the mirror

The reflexive pronoun and reflexive pronoun for singular first person 'I' is 'myself'.

Explanation

The correct sentence is:

"Either of the plans is workable."

 "Either" is singular, so it takes a singular verb ("is").

The second option is incorrect because "either" should be followed by "is," not "are."

Explanation

Know is a verb.

Knew is the second form

while

known is the third form of Know.

Passive Voice = Object + is/am/are + third of verb + to + subject.

Explanation

incorrect: They said to us, "Are you leaving tomorrow."?

correct: They asked us if we were leaving the next day

Rules:

Said changes to asked.

Remove inverted commas. 

Make it simple from interrogative.

Add if.

Tomorrow changes to the next day. 

Explanation

incorrect: All along the centuries, there have been wars

correct: All over the centuries, there have been wars

Over the centuries is one of the most popular phrases in English.

Explanation

incorrect: A third of the prisoners is from Spain

correct: A third of the prisoners are from Spain

Generally, a third of something takes a singular noun/verb.

Explanation

Passive voice: Did you do it on purpose?

Active voice: Was it done by you on purpose

 (was /were) + subject + V3 + Optional Agents.