Chemistry Homework Questions and Answers

A 475 mL sample of gas is collected over water at 27 degrees C and a total pressure of 675 mm Hg. if the vapor pressure of water at 27 degrees C is 26.7 torr. what is the volume of the gas at standard pressure? A rubber band is considered to be a solid,yet it changes its shape on streching.Why? Calculate the density of Ar(g) at -11 degrees Celsius and 675 mmHg Chemical bond Determine the molar mass of Freon -11 gas if a sample weighing 0.597 g occupies 100 cm^3 at 95 degrees Celsius, and 1,000 mmHg. How long has hydrogen been used as an energy source How would you use litmus paper to identify an acid and an alkali ? If ammonia and hydrogen chloride gas are release from the corner of the room which gas will reach the person first sitting in the centre of the room If I have substrate concentrations of 63, 125, 250 and 375 what are the 1/S of them and if I have initial rates of 258, 513, 685 and 855 what is the 1/V of them? In respiration where do we get glucose from?i know it\'s food but i need a specific answer!!!! Liquids and gases are called fluids.in what way do they differ from each other? On a cold day, a person takes in a breath of 450 mL of air at 86.6 kPa and -10 degrees C. what is the volume of this air in the lungs at 37 degrees C and 650 mm Hg? Qno.1) why do we prefer white cotton clothes in summer while dark woolen clothes in winter?Qno.2)name one liquidmetal and one non metal? The mass of 322 mL of hydrogen gas at 4.0 atm and -73 degrees C is 1.21 grams. what is the density of hydrogen gas at STP? The mass of 322 mL of hydrogen gas at 4.0 atm and –73°C is 1.21 grams. What is the density of hydrogen gas at STP? The smell of hot sizzling food reaches us several metres away,but to get the smell from cold food we have to go close.Why? What are the steps in balancing equations in chemistry for grade 7 What colour flame does barium produce? What colour flame does calcium produce? What colour flame does copper produce? What colour flame does lead produce? What colour flame does potassium produce? What colour flame does sodium produce? What is covalent bonding? What is ionic bonding? What is litmus paper? What is the advantage of compresible nature of gases? What is the vapor pressure at 30 degrees C of a solution of 9.26 g of benzene (C6H6, pure liquid vapor pressure is 155 torr) and 4.26 g of chloroform (CHCl3, pure liquid vapor pressure is 333 torr)? What reaction produces nylon? When was the bunsen burner invented and how was it made? Which law states that at a consistent temperature, the pressure of gas is inversly proportionate to its volume Which part of a bunsen burner is hottest? Who invented the bunsen burner? Why is soap use to treat a bee sting and vinegar used to treat a wasp sting Why does the smell of hot sizzling food reach you several metres away Why is rubber band a solid although it changes its shape when stretched? Ask a new question for this subject Back to subject index