Physical Science 6.3 Naming Binary Ionic Compounds and Writing Formulas Take notes on all Boldface stuff!

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Presentation transcript:

Physical Science 6.3 Naming Binary Ionic Compounds and Writing Formulas Take notes on all Boldface stuff!

Lime emits a bright light when heated to a high temperature Lime emits a bright light when heated to a high temperature. Limelight was used to produce a light that could be focused on a single spot on a stage. The flowerpots seen here were coated with a solution of lime and water. Two or more names for a compound can be confusing. Chemists use a single system for naming compounds.

Describing Ionic Compounds What information do the name and formula of an ionic compound provide? The name of an ionic compound must distinguish the compound from other ionic compounds containing the same elements. The formula of an ionic compound describes the ratio of the ions in the compound.

Describing Ionic Compounds These objects are coated with compounds of copper and oxygen. Based on the two colors of the coatings, copper and oxygen must form at least two compounds. There must be at least two names to distinguish red copper oxide from black copper oxide.

Describing Ionic Compounds Binary Ionic Compounds A compound made from only two elements is a binary compound. Naming binary ionic compounds, such as sodium chloride and cadmium iodide, is easy. The names have a predictable pattern: the name of the cation followed by the name of the anion.

Describing Ionic Compounds This table lists eight common anions. The name of an anion is formed by adding the suffix –ide to the stem of the name of the nonmetal.

Describing Ionic Compounds Metals With Multiple Ions Many transition metals form more than one type of ion. Many paint pigments contain compounds of transition metals.

Describing Ionic Compounds Copper(I) ion has a 1+ charge and a copper(II) ion has a 2+ charge. These ion names can distinguish red copper(I) oxide from black copper(II) oxide. The formula for “copper one oxide” is Cu2O because it takes two Cu1+ ions to balance the charge on an O2– ion. The formula for “copper two oxide” is CuO because it takes only one Cu2+ ion to balance the charge on an O2– ion.

Describing Ionic Compounds Writing Formulas for Ionic Compounds Use the name of an ionic compound to write its formula. The symbol of the cation is first, followed by the symbol of the anion. Use subscripts to show the ratio of the ions in the compound.

Describing Ionic Compounds Because all compounds are neutral, the total charges on the cations and anions must add up to zero. Suppose an atom that gains two electrons, such as sulfur, reacts with an atom that loses one electron, such as sodium. There must be two sodium ions (Na+) for each sulfide ion (S2–). The formula for sodium sulfide is Na2S. The 2– charge on one sulfide ion is balanced by the 1+ charges on two sodium ions.

Describing Ionic Compounds Writing Formulas for Ionic Compounds What is the formula for the ionic compound calcium chloride?

Describing Ionic Compounds Read and Understand What information are you given?

Describing Ionic Compounds Read and Understand What information are you given? The name of the compound is calcium chloride.

Describing Ionic Compounds Plan and Solve List the symbols and charges for the cation and anion.

Describing Ionic Compounds Plan and Solve List the symbols and charges for the cation and anion. Ca with a charge of 2+ and Cl with a charge of 1–

Describing Ionic Compounds Plan and Solve List the symbols and charges for the cation and anion. Ca with a charge of 2+ and Cl with a charge of 1– Determine the ratio of ions in the compound.

Describing Ionic Compounds Plan and Solve List the symbols and charges for the cation and anion. Ca with a charge of 2+ and Cl with a charge of 1– Determine the ratio of ions in the compound. It takes two 1– charges to balance the 2+ charge. There will be two chloride ions for each calcium ion.

Describing Ionic Compounds Plan and Solve List the symbols and charges for the cation and anion. Ca with a charge of 2+ and Cl with a charge of 1– Determine the ratio of ions in the compound. It takes two 1– charges to balance the 2+ charge. There will be two chloride ions for each calcium ion. Write the formula for calcium chloride.

Describing Ionic Compounds Plan and Solve List the symbols and charges for the cation and anion. Ca with a charge of 2+ and Cl with a charge of 1– Determine the ratio of ions in the compound. It takes two 1– charges to balance the 2+ charge. There will be two chloride ions for each calcium ion. Write the formula for calcium chloride. CaCl2

Describing Ionic Compounds Look Back and Check Is your answer reasonable?

Describing Ionic Compounds Look Back and Check Is your answer reasonable? Each calcium atom loses two electrons, and each chlorine atom gains one electron. So there should be a 1-to-2 ratio of calcium ions to chloride ions.

Describing Ionic Compounds 1. Write the formula for the compound calcium oxide.