How many atoms are there in 2 moles of sodium?

A. 6.02 * 10^23 atoms

B. 1.2 * 10^24 atoms

C. 3.32 * 10^24 atoms

D. 2.4 * 10^25 atoms

(NOT A OR D)

Which is the best pure substance gold or air?

When a connector is marked with "al-cu," the connector is suitable for use with copper, copper-clad aluminum, and aluminum conductors?

Why is slate used for roofing shingles?

A mixture of 0.220 moles rn, 0.350 moles o2 and 0.640 moles ar has a total pressure of 2.95 atm. what is the pressure of o2? a mixture of 0.220 moles, 0.350 moles and 0.640 moles has a total pressure of 2.95. what is the pressure of? 0.649 atm 1.

Which equation represents a physical change? (1) H2O (s) + 6.01 kJ = = >H2O (l) (2) 2H2 (g) + O2 (g) = = >2H2O (g) + 483.6 kJ (3) H2 (g) + I2 (g) + 53.0 kJ = = >2HI (g) (4) N2 (g) + 2O2 (g) + 66.4 kJ = = > 2NO2 (g)

What did scientists observe using the earliest microscopes

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.

How are electromagnetic different than all other waves

Find the ratio of speeds of an electron and a negative hydrogen ion (one having an extra electron) accelerated through the same voltage, assuming non-relativistic final speeds. Take the mass of the hydrogen ion to be 1.67*10^{-27} kg.

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