3. How many moles of sodium are needed to react with sulfuric acid to produce 3.75 moles of

sodium sulfate according to the following (unbalanced) reaction:

Na + _ H2 (SO4) = __ Na2 (SO4) + __ Hz

A chunk of silver has a heat capacity of 42.8j and a mass of 181g calculate the specific heat of silver.

How will you know whether a solution is saturated or supersaturated?

Which of these statements describes the size of an atom? A. An atom is larger than a sheet of aluminum foil. B. An atom is small but can be seen with just our eyes. C. An atom is the size of a plastic building block. D.

When a mixture of PH3, P2, and H2 comes to equilibrium at 873 K according to the reaction 2PH3 (g) ←-→P2 (g) + 3H2 (g) Kp = 398 at 873 K, where Pp2 = 0.414 atm and PH2 = 0.827 atm.

Which of the following is the correct word equation for the reaction described below? Mercury (II) oxide breaks down when it is heated to form oxygen gas and liquid mercury.

Iodine-131 decays to form xenon-131. the half-life of this reaction is 8.07 days. from a 200-g sample of iodine-131, how much of the sample is xenon-131 after 16.14 days?

Complete the following statement by checking all that apply Creativity allows scientists to develop multiple approaches to solving problems. adapt to changes in scientific knowledge. look at old problems in new ways.

The atomic weight of hydrogen is 1.00794. a. True b. 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?