Air has 21% oxygen by volume. Oxygen has a density of 1.31 g/L. What is the volume in liters of a room that holds enough air to contain 55 kg of oxygen

Eric needs a metal that he can bend and shape easily but that will not conduct electricity well. He will need to melt the metal, but his melting equipment can only reach 750°C.

Gaseous ethane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water. Suppose 9.32 g of ethane is mixed with 12. g of oxygen. Calculate the minimum mass of ethane that could be left over by the chemical reaction.

Can nonsmokers hold their breath longer than people who smoke? Write the independent variable, the dependent variable, and the hypothesis.

Explain why ions become solvated in aqueous solution.

9) How do you know a chemical change has occurred? a. New bonds have formed or bonds have broken. b. The matter has had a change in state. c. The temperature has changed. d. All of the above e. Only a and c are indicators of a chemical change.

Which of these is NOT a colloid? a. Blood b. Fog c. Mountain Dew Soda d. Milk

What range of PaO2 should be maintained in infants to minimize the risk of retinopathy of prematurity (ROP) ?

Is wood a compound, element or mixture

What compound is formed when CO2 is bubbled through water? Show the reaction.

A chemical formula written above or below the yield sign indicates: a. that a gas is formed. b. that the substance is used as a catalyst. c. that heat must be supplied. d. a reversible reaction.