Identifique a equação que forma uma base:

a) 2NaOH+2SO=Na2SO4+H2O

b) 2NO2+2O=HNO2+HNO3

c) H2O+CaO=Ca (OH) 2

d) SO2+H2O=H2SO4

e) 2Mg+O2+2MgO

Which statements correctly describe the process of nuclear fusion? It happens only to large atoms. It occurs naturally in the Sun. It releases a large amount of energy. It bonds atoms together to create molecules.

A 76.0 mL aliquot of a 1.40 M solution is diluted to a total volume of 208 mL. A 104 mL portion of that solution is diluted by adding 153 mL of water. What is the final concentration?

In which of these samples do the molecules most likely have the least kinetic energy? solid iron at 25°C molten iron at 1600°C solid iron at 98°C iron vapor at 2900°C

What stores groundwater and let's ground water flow through it?!

What's is the percent composition by mass of oxygen in magnesium oxide, Mg0

The 4 main layers of the atmosphere are organized according to what?

Which layer of soil in the diagram contains clay and other particles of rock but little humus?

Sodium can achieve greater stability in its valence shell by

Resonance in air columns is used in which of these musical Instruments?

A student prepared a standard stock copper (II) sulfate solution with an absorbance value of 0.862. The student then decided to prepare a second solution containing copper (II) sulfate from the standard stock solution.