A particular atom of calcium has 20 protons, 21 neutrons, and 19 electrons. what is the electrical charge on this atom?

For the skeletal chemical equation Fe2P (s) + S (s) → P4S10 (s) + FeS (s) what is the coefficient of P4S10 in the balanced equation? (Balance the equation with the smallest possible whole number coefficients.) 1. 6 2. 18 3. 9 4. 2 5. 5 6. 10 7. 3 8.

How much does 1.5 x 10" atoms of neon weigh?

The space shuttle Endeavor is launched to an altitude of 400,000 m above the surface of the Earth. The shuttle travels at an average rate of 750 m/s. How long will it take for Endeavor to reach its orbit? Question 4 options: 0.53 s 533.

1) How many grams of CO are needed to react with an excess of Fe2O3 to produce 225.5 gFe? Numbers after symbols are subscripts unless there is a ^ to show it is an exponent ... Fe2O3 (s) + 3CO (g) - - > 3 CO2 (g) + 2 Fe (s) ...

What is the charge of an ion that contains 10 electrons, 13 protons, and 15 neutrons

In the reaction, Zn + HCl-> ZnCl2 + H2, 25 grams Zn are reacted with 17.5 grams HCl. How many grams of H2 will be produced? A. 0.382 g of H2 B. 0.479 g of H2 C. 0.7865 g of H2 D. 0.484 g of H2

Is nail varnish soluble?

What is the periodic trend for atomic size from top and bottom in a group? From left to right in a period?

Which planets' orbits is the belt located between the main asteroid belt?

For the baeyer-villiger oxidation of cyclohexyl methyl ketone