How many moles of calcium (Ca) atoms are there in 77.4 g of Ca?

Which of the following would be the best empirical evidence of the cycling of water in a terrarium? A. Condensation droplets B. Healthy plants C. Dry soil D. Moving invertebrates

How many atoms are in Cu2MgHO

How would physical changes to Earth such as an iceberg or rising sea levels lead to physical changes in organisms?

1. Predict the charge each of the following atoms would have as an ion - if more than one charge is possible, include each different charge (use your cheat sheet). a. Cl b. Na c. Mg d. O e. Al f. Fe g. Cu h. Zn

The oxidation numbers of nitrogen in NH3, HNO3, and NO2 are, respectively: A) - 3, - 5, + 4 B) + 3, + 5, + 4 C) - 3, + 5, - 4 D) - 3, + 5, + 4 is it D?

Whats the difference between china and Europe

Iodine pentafluoride gas reacts with iodine fluoride gas producing iodine heptafluoride gas and iodine gas. What is the maximum number of grams of iodine gas that can be produced from a reaction of 10.0 g of iodine pentafluoride with 11.

What evidence of a chemical reaction might you see in dropping an Alka-Seltzer tablet into a glass of water?

State hess's law. how is it used

When the name of a molecule ends in - ose, the molecule is a