9) 9.010 x 10-6

How many significant numbers are there?

Explain why c 12 6 and c 14 6 are istopes of carbon

What is the name of the species formed when a sodium atom loses an electron?

How can valence electrons be used to predict the type of compounds formed?

What is the most likely reason that nonmetals are electrical insulators?

A student measures the length of a 1.00 m standard bar. He obtains measurements of 0.99 m, 1.01 m, and 1.00 m. Which describes his measurements? A. precise but not accurate B. accurate but not precise C. neither precise nor accurate D.

Two students design an experiment to see if pushing or pulling a box across the floor is more effective. The first student pushes the box across the floor a distance of 20 feet and the second student times how long it takes.

15.00 g of NH4HS (s) is introduced into a 500. mL flask at 25 °C, the flask is sealed, and the system is allowed to reach equilibrium. What is the partial pressure of ammonia in this flask if Kp = 0.108 at 25 °C for: NH4HS (s) ⇄ NH3 (g) + H2S (g) ?

Among elements 1-18, which element or elements have the smallest effective nuclear charge if we use the equation zeff=z-s to calculate zeff? check all that apply.

Two clear solutions are placed in separate beakers. The first solution has a pH of 4, and the pH of the second solution is unknown. If the two solutions are mixed and the resulting pH is 5, the second solution must have

Based on its location on the periodic table, which element (s) have properties similar to N? Choose all that apply. * P C O Bi