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Chemical Names and Formulas of Compounds: A Guide to Naming and Writing Chemical Formulas, Exams of Chemistry

Lincoln Christian UniversityChemistry

Magnesium donates two electrons, one to each florine, leaving it with a charge of 2+. Fluoride. Each fluorine atom receives an electron from ...

Typology: Exams

2021/2022

Uploaded on 09/12/2022

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2015-10-31
1
Chemical Names and Formulas
of Compounds
PowerPoint 4.2
How to Determine the
Chemical Name of an Ionic Compound
1. Name the metal ion, the cation.
2. Name the non-metal, the anion,
adding the suffix –ide.
3. Write the name of the
compounds, with the cation
first.
MgF2
Magnesium
Magnesium donates two electrons,
one to each florine, leaving it with a
charge of 2+.
Fluoride
Each fluorine atom receives an
electron from magnesium thereby
forming the fluoride anion.
Magnesium fluoride
pf3
pf4

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Download Chemical Names and Formulas of Compounds: A Guide to Naming and Writing Chemical Formulas and more Exams Chemistry in PDF only on Docsity!

Chemical Names and Formulas

of Compounds

PowerPoint 4.

How to Determine the

Chemical Name of an Ionic Compound

1. Name the metal ion, the cation.

2. Name the non-metal, the anion,

adding the suffix – ide.

3. Write the name of the

compounds, with the cation

first.

MgF 2

Magnesium

Magnesium donates two electrons, one to each florine, leaving it with a charge of 2+.

Fluoride

Each fluorine atom receives an electron from magnesium thereby forming the fluoride anion.

Magnesium fluoride

How to Determine the

Chemical Formula for an Ionic Compound

  1. Identify each ion and their respective charges.
  2. Determine the number of each ion needed to balance the positive and negative charges.
  3. Note the ratio of positive and negative ions
  4. Write the formula with the ratio in subscript numbers A “1” is not written in the formula.

Usually, the ratio is simplified if possible.

Magnesium and fluoride

Mg2+^ and F- Mg^2 +^ +2 = + 2 1 Mg2+ F-^ - 1 - 1 = - 2 2 F- There are 2 F-^ for each 1 Mg2+. MgF 2 Chemical equation, Mg^2 +^ + 2F-^ → MgF 2

How to Determine the

Chemical Formula for Ionic Compounds with

Multivalent Metals

Chromium (III) nitride Cr3+^ and N^3 - Cr3+^ +3 = +3 1 Cr3+ N^3 -^ - 3 = - 3 1 N^3 - There is 1 Cr3+^ for each 1 N^3 -. Cr 3 N 3 CrN “Chromium three nitride” Chemical equation, Cr3+^ + N^3 -^ → CrN

  1. Identify each ion and their respective charges.
  2. Determine the number of each ion needed to balance the positive and negative charges.
  3. Note the ratio of positive and negative ions
  4. Write the formula with the ratio in subscript numbers A “1” is not written in the formula. The ratio is typically simplified if possible.

Cr N

3 + 3 -^

Cross-Over rule CrN

  1. Identify each ion and their respective charges.

 Tip - If you don’t find the element on the Periodic

Table check the list of polyatomic ions.

  1. Determine the ratio of ions needed to balance the positive and negative charges.  The positive and negative charges must balance.

  2. Write the name of the compound with the cation first.  Place brackets around polyatomic ions if more than one is needed. Ammonium phosphate NH 4 +^ and PO 43 - PO 43 -^ 1(-3) = - 3 NH 4 +^ x(1) = + x = 3 There are 3 NH 4 +^ for each 1 PO 43 -. (NH 4 ) 3 PO 4

How to Determine the

Chemical Formula for Ionic Compounds

with Polyatomic Ions