How many electrons are present in 4He2+?

1. 6

2. 4

3. 1

4. 2

5. 0

6. None of these

7. 3

8. 5

How many significant figures are in 11.005 g

Calculate the [H3O+] of solutions a and b; calculate the [OH-] solutions c and d. 9. pH = 2.76 10. pH = 3.65 11. pOH = 3.65 12. POH = 6.87

How many moles are in 15.0 grams of lithium

A copper (cu) atom has 29 neutrons, 29 protons, and 29 electrons. What is the overall charge of the copper atom?

A chemist places a 100 g cube of each of the metals listed in the table on a separate hot plate. All of the hot plates are identical. Each hot plate is set on medium heat, and all of the cubes have the same initial temperature.

Find the acceleration if a car goes from 40 to 50 mph in 5 seconds

What is the percent by mass of nahco3 in a solution containing 10 g of nahco3 dissolved in 400 ml of h2o?

Consider the reaction: 2clf3 (g) + 2nh3 (g) → n2 (g) + 6hf (g) + cl2 (g) when calculating the δh°rxn, why is the δhf° for n2 not important?

12.5 g of copper are reacted with an excess of chlorine gas, and 25.4 g of copper (II) chloride are obtained. Calculate the theoretical yield and the percent yield.

Section 20.1 the meaning of oxidation and reduction answer key