What is the mole fraction of oxygen gas in air (see table 5.3 in the textbook) ? express your answer using two significant figures?

Which instrument would be used to measure the mass of a small stone? I 1. graduated cylinder 2. Celsius thermometer 3. triple-beam balance 4. metric ruler

A mixture of He, He, Ne, Ne, and Ar Ar has a pressure of 18.8 atm 18.8 atm at 28.0 °C. If the partial pressure of He He is 2.94 atm 2.94 atm and the partial pressure of Ar Ar is 4.27 atm, 4.27 atm, what is the partial pressure of Ne? Ne?

The table below shows some physical properties of two unknown samples. Physical Properties Sample Mass Solubility (in water) C 200 g 36 g/mL D 500 g 180 g/mL What would best support whether the two samples are of the same substance or not?

Which condition is necessary for water droplets to condense and form clouds? dry air, ice crystals in air, tiny particles in air, rising temperatures

he solution is said to be an ideal solution, only when the intermolecular forces of attraction between A-A, B - B and A - B are nearly equal. True False

Describe What kind of ions do metals form? What kind of ions do nonmetals form?

A car is driven through streets treated with salt and then parked in a warm garage. a) How will the rate of rusting compare with a car that has not been driven in the streets treated with salt but left parked outside?

Amalgam is an alloy that contains mercury and other metals. Which of these atoms would most likely form metallic bonds with mercury? Check all that apply. bromine copper hydrogen iodine silver tin

Which fossil fuel is the most widely consumed in the United States? A. petroleum B. natural gas C. peat D. coal

Why is the use of natural gas as a full becoming more common