Which of these is a compound a sugar b window cleaner c nitrogen d silver

I'm pretty sure (C) Nitrogen is a compound.

The answer is A. Sugar.

C. Nitrogen and D. Silver  are an elements. Compounds are made of elements so that's why you can cross those out.  B. Window cleaner is a mix of compounds so it's considered a mixture.

Sugar aka Glucose is the only one that is a compound. The compound for sugar is C6H12O6.

Hope this helps!

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.