Which has the greater density? air at sea level air or at 20 km altitude?

Most of the record for the ancient Egyptians came from inscriptions on temple walls and paintings left behind on Tomb walls true or false

Identify the neutralization reaction. 2NH3 + H2SO4 ⟶ (NH4) 2SO4 2H3PO4 + 3Ba (OH) 2 ⟶ 6H2O + Ba (PO4) 2 2 NO2 ⟶ 2 O2 + N2 PO4 3Pb + 2H3PO4 ⟶ 3H2 + Pb3 (PO4) 2

A sample of diborane gas a substance that bursts into flame when exposed to air, has a pressure of 345 tore at a temperature of - 15C and a volume of 3.48 L.

the white tern bird that catches fish by plunging into the water. what physical features of the bird likely make this feeding behavior possible?

How many moles are in 23.4 g

Consider the model of the nitrogen atom. Which electron configuration matches this model? 1s22s22p2 1s22s22p3 1s22s22p4 1s22s22p5

In this experiment, you need to examine the idea of thermal energy transfer. Using a controlled experiment, .

What is the pressure of 2.3 moles of carbon dioxide gas stored in a 2 liter container at a temperature of 423 K? Given: a = 3.59 liters2 ∙ atmospheres/mole2, b = 0.0427 liters/mole, and R = 0.08205 liters∙atmospheres/K∙mole 37.22 atm 41.96 atm 79.

A bird is flying north at 18 m/s. A gust of wind from the North exerts an unbalanced force on the bird. What will happen to the bird's speed?

Calcium fluoride, CaF2, has a molar solubility of 2.1 x 10^-4 mol/L at pH = 7.00. By what factor does its molar solubility increase in a solution with pH = 3.00? The pKa of HF is 3.17 (A) 1.48 (B) 1.83 (C) 2.48 (D) 4.96