If you start with 5 molecules of O2 in the reaction 2Mg+O2--> 2MgO, how much Mg will you need?

a.

4

c.

8

b.

5

d.

10

A certain voltage is applied to a copper wire and to a germanium wire of the same thickness and length. how will the current in the two wires compare?

Which of the following correctly compares UV rays and x-rays? A) X-rays have the same wavelength as UV rays. B) UV rays have the same energy as X-rays. C) X-rays have a higher frequency. D) UV rays have lower energy.

Are natural gas, oil and coal are all considered to be fossil fuels?

What happens to a system in dynamic equilibrium when it is disturbed in some way?

What are the major storage reservoirs of carbon

Which of the following statement is not true? A) The sun is involved in producing tides B) There can be two high tides in one location during a single day C) Only the oceans have tides D) If there is a high tide, there will be a low tide

A solution which has a concentration that exceeds its predicted solubility at a certain temperature and pressure would be -

Convert 4.992*1010 g to each of the following units. B. Mg c. mg D. metric tons

The ideal gas law shows us how a gas will behave under many conditions. The formula is: P V = n R T Where P = pressure, V = volume, n = amount of the substance, R = ideal gas constant, and T = temperature.

The Suns ultraviolent Rays can cause skin damage including sunburn and even skin