Why does helium raise you voice

What type of solution contains higher than normal amounts of osmotically active solutes?

Using the van der Waals equation, find the pressure exerted by 1 mole of Ar gas stored in a 1.42-liter container at 300 K. Given: a = 1.35L2 · atm/mol2, b = 0.0322 L/mol, and R = 0.08205 L · atm/K · mol

A part of your throat that acts like a gateway sending air into the lungs and food down into the stomach

Which of the following is a chemical property of water? boils at 100 °C Has a density of 1 gm/mL Is liquid at room temperature Reacts with pure sodium

1. A chemist prepares hydrogen fluoride by means of the following reaction: CaF2 + H2SO4 - > CaSO4 + 2HF The chemist uses 11 g of CaFz and an excess of H2SO4, and the reaction produces 2.2 g of HF. (a) Calculate the theoretical yield of HF.

Two components combine to create a binary ionic compound. Name one of them

True or false. The synthesis of giant molecules from components of repeating units is polymerization.

Which term names an environmental cost of fossil fuel consumption? A. cheap energy B. increased greenhouse gases C. renewable resource D. low pollution

Slowly heating butter in a pan until it changes from a solid to a liquid is an example of a physical change. True False

Action - reaction forces don't cancel each other. A. True B. False