Which of the following is an example of a molecule? (A) CO₂ (carbon dioxide). (B) H₂O (water). (C) O₂ (oxygen in atmosphere). (D) NaCI (sodium chloride:table salt).?

How many moles of compound are present in 33 grams of KMnO4? Answer in units of mol.

The table below gives the numbers of protons, electrons, and neutrons in four atoms. | 39 Atom Number of protons Number of electrons Number of neutrons 3952 12 40 40 5 0 39 39 54 4404051 20 | Based on the information that is given, which atom in the

Salt is disstilled in a flask of tap water. Distilling the mixture cause the salt to seperate from the water. Which type of energy is required to begin the distilling process?

In the periodic table, the period number indicates A. the number of dots shown on the Lewis dot diagrams for elements in that period. B. the number of valence electrons for elements in that period. C.

How many moles of acetylene gas occupy a volume of 3.25 l at stp?

As transformações estão presente em nosso cotidiano, elas nunca param de acontecer, na sua maioria invisível a olho nu. Quais critérios é preciso observar para identificar se ocorreu transformação?

U human ear is measured in?

Is the earth older than any of the rock layers.

Problem page liquid hexane reacts with gaseous oxygen gas to produce gaseous carbon dioxide and gaseous water. what is the theoretical yield of water formed from the reaction of of hexane and of oxygen gas?

Calculate the mass percent of a NaCl solution in which 140g of NaCl is dissolved in 4.50L of water at 25C (density = 0.997g/mL).