Two moles of oxygen gas is reacted with hydrogen gas to produce water in this reaction: 2 H2 + O2 → 2 H2O In the lab you actually made 33.1 grams of water. What is the percent yield? 218.10% 91.80% 45.87% 54.50%

Why does the rate of a chemical reaction typically decrease over time? A. The pressure decreases as the product is formed. B. The temperature decreases as the reaction continues. C. The effect of the catalyst decreases as the reaction continues. D.

Who suggested the Billiar d Ball what were his conclusions about the structure of an atom?

Describe the formation of an ion feom a metal and nonmetal in terms of the octet rule?

Why is it necessary to heat the unknown metal carbonate before dissolving it in water? (Gravimetric Analysis of a Carbon Kit)

In which of these situations would light slow down? A. from plastic to air B. from ice to water C. from a vacuum to air D. from glass to air

Calculate the pH for an acid that has a [H+] of 5.8 x10^-11 M.

Complete the lewis dot structure for h2co (in which both h atoms are bonded to c).

Do substances have to be cold to freeze?

Which statement is true of the carbon atoms that make up a diamond? A. They can slip past one another slowly. B. They are always vibrating in place. C. They vibrate only when they are heated. D. They are locked in place and do not move at all.

A 48.3 mL sample of gas in a cylinder is warmed from 22 C, 87 C to 0.0 C what is the final temperature