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%

Sodium reacts with chlorine gas to produce sodium chloride if 10 moles of chlorine reacts with 5 moles of sodium, which reactant will be the limiting reactant

Type of Compound? Electrolyte or Non-electrolyte? NaCl CO2 Al2O3 H2O2 CaF2

A compound has 39 g of potassium and 78 g of selenium. What is the mass ratio of potassium and selenium in the compound

Why is a standard system of measurement important? A. Scientists want to share measurement data that they can understand. B. Each country wants its own set of measurement standards. C.

The pH of a neutral solution is below 7 above 7 7 7.5

Increasing the temperature increases the rate of a many reactions by:

2A balloon filled with helium occupies 20.0 L at 1.50 atm and 25°C. How many moles of helium will there be in the balloon at STP? A. 22.4 moles B. 1.12 moles C. 0.0446 moles D. 0.893 moles E. 1.23 moles F. 4.55 moles

1. Which has a larger radius Ca atom or Ca+2 ion? 2. Which has a greater radius F atom or F - ion? 3. Which is the correct way of understanding the trend for Ionic radius Vs. Atomic radius?

For which of the following activities might you want to hire a chemist? A. examining the structure of plant cells B. building a fence C. building a wood storage shed D.

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