Which contains 3 significant figures.

A. 5.0x10^2

B. 500

C. 0.001

D. 1.00x10^-3

E. 0.00100

F. 395

Watch the animation, then check off the samples that will conduct electricity.

An aqueous solution has a mass of 490 grams containing 8.5 103 gram of calcium ions. The concentration of calcium ions in this solution is (1) 4.3 ppm (3) 17 ppm (2) 8.5 ppm (4) 34 ppm

How many grams of nitrogen are needed to produce 100 grams of ammonia gas?

Molarity is defined as the 1. moles of solute per kilogram of solvent 2. moles of solute per liter of solution 3. mass of a solution 4. volume of a solvent

A sucrose solution is prepared to a final concentration of 0.210 M. Convert this value into terms of g/L, molality, and mass % (molecular weight, MWsucrose = 342.296 g/mol; density, ρsol′n = 1.02 g/mL; mass of water, mwat = 948.1 g).

What is an example of making a qualified observation

With respect to composition, how is the compound made from hydrogen and oxygen different from mixtures of these two elements?

How should scientist respond when new evidence that challenges current is presented?

Consider the following reaction, equilibrium concentrations, and equilibrium constant at a particular temperature. Determine the equilibrium pressure of H2. D2 (g) + H2 (g) ⇌ 2 HD (g) Kp = 1.80 P (D2) eq = 1.1 * 10-3 atm P (HD) eq = 2.7 * 10-3 atm

Find δe for the change in state of 1.0 molh2o (l) at 79 ∘c to h2o (g) at 116 ∘c. the heat capacity of h2o (l) = 75.3 j/molk, heat capacity of h2o (g) = 25.0 j/molk, and the heat of vaporization of h2o is 40.7*103j/mol at 100 ∘c.