Why elements in the same group have the same charge

Which of the following substances is an Arrhenius acid? BF3 HCN NH3 Mg (OH) 2

A solution has a [H+] = 0.00025. What is the pH of this solution?

What could J. J. Thomson conclude from his experiments? Atoms are mostly empty space. Most of the mass of the atom is concentrated in the center. Atoms must balance positive and negative particles. Atoms are indivisible.

Where would electrons in the d sublevel be found? Only in the n = 3 energy level in energy levels 3 possibly in any energy level

A car of m = 1200. Kg collides with a tree while traveling 60. oo mph. The collision occurs over a time perido of 0.0500 seconds. Determined the margnitude of the force exerted on the car as it comes to rest during the collision (1 m/s = 2.24 mph

If 5.0mL of HC2H30 require 4.96mL of 0.9581 M NaOH to just consume the HC2H302, what is the concentration of the HC2H3O2? If necessary, show the calculation on a separate sheet of paper, scan, and submit with your lab report.

How many formula units of CaSO4 are in 17g of CaSO4?

Which of these would be an appropriate way to describe the concentration of orange candies? Check all that apply the number of orange candies divided by total number of candies the mass of orange candies divided by total mass of candies the volume

A 8.00 L tank at 26.9 C is filled with 5.53 g of dinitrogen difluoride gas and 17.3 g of sulfur hexafluoride gas. You can assume both gases behave as ideal gases under these conditions.

What type of wave is sound? a. gamma b. pressure c. electromagnetic d. light