Which of the following reactions shows a chemical change producing a gas? A. 2CH2OH(1) + 302(9) ► 2002(g) + 4H2O()
B. H2(g) + O2(g) → H20(1)
C. NaCl(s) - NaCl(aq)
D. 2AgNO3(aq) + CaBr2(aq) → 2AgBr(s) + Ca(NO3)2(aq)

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

What is the most important factor in determining climates.

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory