Electrochemistry Word Problems Worksheet With Answers printable pdf download

Electrochemistry Word Problems Worksheet With Answers

Name : __________________ Science- 8 Period __________ Date: _______________________

Chemistry Unit Review

1. The atomic number for Phosphorous is 15. What does this tell you about Phosphorous?

Has 15 protons

Has 15 electrons

2. What is the number of neutrons in a neutral atom of Rubidium?

3. Describe the most reactive and least reactive families of the Periodic Table of Elements.

Group 1 (hydrogen family) is the most reactive because they have only 1 valence

electron it wants to give up really bad

Group 18 (helium family; Noble Gases) is least reactive because they have 8

valence electrons making its outer shell full…they do not want more or to give up

any

4. How many valence electrons exist in an electrically neutral atom of Aluminum? What does this

tell you about the Boron Family that contains Aluminum?

Everyone contains 3 valence electrons and will react in similar ways

5. Describe possible evidence that would suggest that a chemical change has occurred?

(max 3 checks)

change in color

light given off

temperature change

new substance formed

gas given off

bubbles

smell given off

precipitate

6. How many protons are in one molecule of NH

? How many protons would there be in two

molecules of NH

(7+1+1+1+1) 11

2 x 11 = 22

7. Describe the chemical formula: 4NaHCO

4 molecules of a compound containing 1 atom of sodium, 1 atom of hydrogen, 1

atom of carbon, and 3 atoms of oxygen

8. List and describe the 3 subatomic particles of an atom. Include location, mass, and charge.

Proton: + charge; mass = 1 amu; nucleus

Neutron: no charge; mass = 1 amu; nucleus

Electron: - charge, mass ≈ 0; electron cloud

9. Name 3 elements that have similar chemical properties to Cesium.

Hydrogen

Sodium (or potassium,

Lithium

rubidium, francium)

Electrochemistry Word Problems Worksheet With Answers