Which part of a chemical formula indicates the number of copies of molecules or compounds?

Express 602 X 10^21 in scientific notation

How much diluent do you need to add to a 2 gm vial of Rocephin to get a concentration of 250 mg/ml? Disregard the space the powder may occupy.

What is unusual about aluminium oxide?

Oil floats on the surface of water but mercury sinks. why?

At what pH do you think acids become too dangerous to touch? Basis? Explain your answers.

How to find h30 in 0.08m

Nitroglycerin (c3h5n3o9) is a powerful explosive. its decomposition may be represented by 4c3h5n3o9 → 6n2 12co2 10h2o o2 this reaction generates a large amount of heat and gaseous products.

A 3-column table with four rows. The first column has entries Liquid A, Liquid B, Liquid C, Liquid D. The second column titled mass has entries 160 grams, 173 grams, 198 grams, 220 grams.

Which option correctly describes the influence of electronegativity difference on bond character?

How do I write a balanced half-reaction describing the reduction of gaseous dioxygen to aqueous oxide anions?