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 statements describe polyatomic ions? Check all that apply. Polyatomic ions have many charges. Polyatomic ions have one overall charge. Polyatomic ions repel other ions to form ionic bonds. Polyatomic ions attract other ions to form ionic bonds.

When a car drives down a street, what evergy conversions are happening?

Thea dissolves 0.33 mole of glucose into 450 mL of water. What is the concentration of the solution?

How many ml of a 0.155 m kcl solution contain 2.55 g kcl?

Imagine that a rigid container is filled with a liquid, then closed and heated. What change would be observed? A) The liquid would expand. B) The liquid would change into a gas. C) The temperature of the liquid would not change.

A substance that speeds up the rate of a chemical reaction is called a. a catalyst. b. a lipid. c. a molecule. d. an element.

How many moles of Mgs203 are in 245g of the compound

A student was trying to obtain lithium by electrolysis of aqueous lithium chloride. Was he successful?

A Gouy balance is used to determine the magnetic susceptibility of a substance. A strong electromagnet is placed next to the sample, which is on a balance.

Is the bonds that cause gaseous Cl2 to become liquid when cooled intramolecular or intermolecular