If cobalt metal is mixed with excess sulfur and heated strongly, a sulfide is

produced that contains 55.06% cobalt by mass. Calculate the empirical

formula of the sulfide.

What is really occurring when you feel "cold flowing into you" when you go outside on a cold winter day? A. Cold is flowing into you from the air. B. Heat is flowing into you from the air. C. Cold is flowing into the air from you. D.

Energy states of atoms containing more than one electron arise from nucleus-electron and electron-electron interactions.

Aspirin was first synthesized in:

How is the concentration gradient of a substance important to diffusion?

Which of the following equations represents an unbalanced neutralization reaction equation? a) HBr + Ca (OH) 2 → CaBr2 + H2O b) SO2 + H2O → H2SO3 c) NaCl + H2O → HCl + NaOH d) Na + H2O → NaOH + H2

Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure.

When you light a fire place what energy transformation takes place

Correctly identify the generic formula for a synthesis reaction. a. AB + A+B b. A+B → AB c. CxHx + O2 → CO2 + H2O d. AB + C + AC + B e. AB + CD → AD + CB

Zinc phosphide, Zn3P2, is often used as a rat poison. Phosphorus has 5 valence electrons. How many valence electrons does each zinc atom lose?

Nonrenewable resources are?