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# Writing Formulas, Naming Compounds, and Balancing Equations.

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## Kimberly Cribb

on 23 April 2015

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#### Transcript of Writing Formulas, Naming Compounds, and Balancing Equations.

Writing Formulas, Naming Compounds, and Balancing Equations... Oh, My!
NORMALLY the CATION (positive charge) is listed first.

Writing formulas: Use the cross or swap-and-drop method.

Example: Write a formula using calcium and fluorine.

Step 1. Write the symbols for the cation and then anion.
Step 2. Write the oxidation number on top of the symbols.
Step 3. Cross the numbers only.

Write a formula using phosphorus and sulfur.

Example 19-1

Example 19-2

***Bonus material: Swap and drop using polyatomic ions (ions with more than one atom in them that act as if they are ONE atom). See the polyatomic ion chart.

***Write a formula using magnesium and nitrate

***Write a formula using potassium and phosphate

Naming compounds

Ionic compounds
May use
ROMAN NUMERALS
if the CATION has more than one oxidation number option. You only use the Roman numeral with the cation ion and not with the anion.

(Think... I = Roman number 1)

Change -ine endings to ide
on the second atom
Just- name the first atom

What is the empirical formula of these?
Naming Covalent Compounds
Use
Greek prefixes
! NO ROMAN NUMBERS!!
Memorize the prefixes on page 471.
Do not use “mono” with the first atom but only with the ones after the first atom.

Bonus: Naming compounds with polyatomic ions

Ammonium chloride ________________
Video Helps
19B

Evidences for chemical change or a chemical reaction– a chemical change happens when substances react to form new substances with new chemical and physical properties.

In chemical reactions the atoms are not destroyed but only rearranged.

Evidence of a reaction include:
1. a solid separates from a liquid mixture (called a precipitate)
2. a gas is produced by means other than evaporation
3. a color change is seen
4. the temperature of the mixture changes without heating or cooling it from the outside
5. light, sound, or other energy is produced

Demo
Chemical Equations:

Write the general form labeling the reactant and product sides.

How to balance chemical equations.
1. List each atom type.
2. Count the number of atoms on the reactant side and product side.
3. Start by using coefficients to help multiply each molecule to balance the number of atoms.
4. You can ONLY change the number of atoms by adding coefficients. You CANNOT add subscripts because this changes the molecule.
Example 19-3
Example 19-4
19C Types of chemical reactions

Composition, synthesis, combination ( S)

Decomposition reaction (DC)

Single replacement (SR)

Double replacement (DR)

Combustion (C)

What type of reactions are these?
(
Balance and Legos
)
Full transcript