Which substance accounts for nearly 80 percent of Earth's atmosphere?

A. oxygen

B. nitrogen

C. carbon dioxide

D. argon

If a sample of copper with a density of 8.90 g/cm3 has a mass of 798 g, what is its volume? 89.7 mL 0.0111 mL 7.10 x 103 mL

What is 0.00550 g converted to mg

The first order rate constant for the conversion of cyclobutane to ethylene at 1000.°C is 87 1/s. Cyclobutane â 2 ethylene (a) what is the half-life of this reaction at 1000.°C (b) If you started with 4.

Which of these represents a synthesis reaction? A. AgNO3 + HCl - > AgCl + HNO3 B. Zn + 2HCl - > ZnCl2 + H2 C. N2 + 3H2 - > 2NH3 D. 2KClO3 - > 2KCl + 3O2

3. A compound was analyzed and found to contain 9.8 g of nitrogen, 0.70 g of hydrogen, and 33.6 g of oxygen. What is the empirical formula of the compound?

A type of rock that undergoes changes because of heat and pressure

How many milliliters of a 1.25 molar HCL solution would be needed to react completely with 60 g of calcium metal Ca+2HCl - - > CaCl2 + H2

What mass of copper is required to replace silver from 4. oog ogre silver nitrate dissolved in water

What kind of bond would two nonmetals typically make?

Which statement best applies collision theory to preventing a dangerous reaction from occurring? Store the reactants together at a low pressure. Keep all sparks or flames away from the reactants. Store the reactants together at a low temperature.