A 2.5600 gram sample of a sulfur-containing compound is analyzed by precipitating the sulfur as BaSO4. If 1.1756 g of BaSO4 are obtained, what is the percentage of sulfur in the sample?

There are 7.11 x1024molecules in 100.0 cm3of a certain substance. a. What is the number of molecules in 1.09 cm3of the substance?7.75 x 1022moleculesb. What is the number of molecules in 2.24 x 104cm3of the substance?1.59 x 10 27moleculesc.

Will helium, neon, or argon atoms react with other atoms?

A miner develops cancer of the esophagus. ten years later

A molecule is polar when: a. electrons are shared equally among its atoms b. one region of the molecule has a small negative charge while another region has a small positive charge c. the molecule has no charged regions d.

Which particle contains the greatest number of electrons? 1. Na 2. Na+ 3. F 4. F-

You would know you were in the troposphere If? It were raining on you You were floating in space You were flying in a high altitude jet You were in the ozone later

A burning match is an example of a chemical change phase change nuclear change physical change

The table below shows the shapes of two samples, C and D, when placed in three containers of different shapes.

How many grams of KCl are produced when 60 grams of K are reacted?

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