a solid x when heated gives up a brown gas. If x is soluble in excess sodium hydroxide solution but insoluble in excess ammonium hydroxide solition. What is X?

2H2 + O2 - - > 2H2O can be classified as what type of reaction? A. Both synthesis and combustion. B. Only synthesis. C. Only combustion. D. It cannot be classified.

A diamond is made of pure carbon. A 1.6-cm³ sample of diamond has a mass of 5.6 g. what is the density of carbon?

What are Kr and Xe. (elements) ?

Which of these best explains what happens when ice melts to form liquid water?

All elements have a unique atomic emission spectrum. In which of the following scenarios would this fact be most useful? A. when trying to determine a star's chemical composition B. when trying to determine how old an artifact is C.

As the average kinetic energy of the particles in a gas increases, which of the following occurs? The temperature of the gas increases. The temperature of the gas decreases. The number of particles increases. The number of particles decreases.

What is the type of strong chemical bond between carbon, hydrogen, and oxygen atoms in a single organic molecule?

0.100 mol of CaCO3 and 0.100 mol CaO are placed in an 10.0 L evacuated container and heated to 385 K. When equilibrium is reached the pressure of CO2 is 0.220 atm. 0.

What is true about the charges of transition metal ions?

A gas obeys the ideal-gas equation of state P V = N k T, where N = n NA is the number of molecules in the volume V at pressure P and temperature T and n is the number of gm-moles of the gas.