1. Magnesium Bromide Step 1: Write out the charges for each ion (2pts)

Step 2: Do the charges cancel out? (1pts)

Step 3: Determine how many of each ion is needed to make the overall charge zero. (1pts)

Step 4: Write the correct formula, correct order and amount of each ion. (2pts)

2. Zinc Phosphide

Step 1: Write out the charges for each ion (2pts)

Step 2: Do the charges cancel out? (1pts)

Step 3: Determine how many of each ion is needed to make the overall charge zero. (1pts)

Step 4: Write the correct formula, correct order and amount of each ion. (2pts)

The compound formula can be determined from the charge of the constituent elements of the compound

There are several compounds :

ion compounds, covalent compounds, and polyatomic  

For ionic compounds consisting of cations (ions +) and anions (ions -)  

The naming is preceded by the cation then the anion with the -ide suffix added  

Generally for this ion compound consists of metal elements as cations and non-metals as anions  

1. Mg²⁺, Br⁻

2. no, +2(Mg) + -1(Br)=+2-1=+1

3. Mg²⁺ 1 ion, Br⁻ need 2 ion

4. MgBr₂, 1 Mg and 2 Br

1. Zn²⁺, P³⁻

2. no, +2(Zn)+ -3(P)=2-3=-1

3. Zn need 3 ion, P 2 ion

4. Zn₃P₂, 3 Zn and 2 P

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.