A sample of an unknown material appears to weigh 290 N in air and 160N when immersed in alcohol of specific gravity 0.700. What is the volume of the material? What is the density of the material?

On the surface of water, hydrogen cannot attach to air. Therefore the ions are pulled inward below the surface of the water. What happens in this type of situation? O nothing happens a high surface tension of the liquid a strong pull of the oxygen ion inward O a weakening of the bonds

Seawater has a salinity of 3.5%, meaning that if you boil away a kilogram of seawater, when you're finished you'll have 35 g of solids (mostly NaCI) left in the pot. When dissolved, sodium chloride dissociates into separate Na+ and CI-ions. Calculate the osmotic pressure difference between seawater and fresh water. Assume for simplicity that all the dissolved salts in seawater are N aCl.

ト Estimate the density of an alloy made from 4.1 kg of silver and 1.7 kg of gold. The density of silver is 10,490 kg/m³ and the density of gold is 19,300 kg/m3. 近。 SNSV f5 f8 ロ/京 64 2$ OL 5 因 9. 8. 9. Y.

A tank with a volume of 0.100 m3 contains helium gas at a pressure of 150 atm. How many balloons can the tank fill if each balloon is a ball with a diameter of 0.300 m and a pressure of 1.20 atm?

Two large tanks, each holding 100L of liquid, are interconnected by pipes, with the liquid flowing from tank A into tank B at a rate of 3L/min and from B into A at a rate of 1L/min. The liquid inside each tank is kept well stirred. A brine solution with a concentration of 0.1kg/L of salt flows into tank A at a rate of 6L/min. The (diluted) solution flows out of the system from tank A at 4L/min and from tank B at 2L/min. If initially, tank A contains pure water and tank B contains 10kg of salt, determine the mass of salt in each tank at time t≥0. What is the solution to the system? x(t)=                                     y(t)=

An irregular sample of zinc has a mass of 23.21 g.  This sample is carefully placed in a graduated cylinder of water with an initial volume of 18.75 mL.  What is the final volume of the water and zinc?  The density of zinc is 7.140 g∙cm–3.

Janice is grilling a steak for her July 4th barbecue dinner. The steak initially weighs 300 grams and is 25 mm thick. After grilling it for a while, she considers the steak done, and measures it again: it now weighs 215 grams, and is 15 mm thick. For both the cooked and uncooked steak, she uses the thumb-test to determine the done-ness, i.e. she uses her thumb (area ~5cm2) to push down with a force of 5 N. The uncooked steak compresses by 7 mm, and the cooked steak by 2 mm. The change in elasticity of the steak on cooking is due partly to the loss of water volume (so that existing bonds get closer together) and partly to the creation of new bonds. Assume all of the difference in raw vs. cooked steak thickness is due to water loss that makes it thinner (25 mm thick in the uncooked steak, versus 15 mm thick in the cooked steak), and that the other dimensions of the steak (length and width) have not changed. By what percentage has the steak's volume decreased from the original value?…

There is a liquid mixture at 20 ° C of 40% acetic acid and 60% by mass of water. Calculate the density of the mixture

A gas has an initial volume of 2.4 L at a pressure of 1.5 atm and a temperature of 273 K. The pressure of the gas increases to 4.5 atm, and the temperature of the gas What is the final volume of the gas? 0.70 L increases to 313 K. 0.92 L 6.3 L 8.3 L Subrit Save and Exit Mark this and teturn ContentViewers/AssessmentViewer/Activit.