calvert gr6 lesson 36 science ionic bonds

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Write the formula for calcium chloride

CaCl

relate the properties of ionic compounds to the characteristics of ionic bonds

Ionic bonds are strong due to the attractions between oppositely charge ions This makes crystals of ionic compounds hard and brittle and causes the compounds to have high melting points because the ions are charged, they can conduct electricity when the compound is melted or dissolved

What are the symbols for the sodium and chloride ions

Na Cl

the formula for sodium sulfide is Na S. Explain what is formula means

Sodium sulfide consists of two sodium ions to every one sulfide ion

chemical formula

a combination of chemical symbols and numbers to represent a substance

ionic compound

a compound that consists of positive and negative ions

Contrast sodium and chloride ions, including how they form.

a sodium ion Na forms when a sodium atom loses one electron and becomes positively charged A chlorine ion Cl forms when a chlorine atom gains one electron and becomes negatively charged.

ion

an atom or group of atoms that has a positive or negative charge

polyatomic ion

an ion made of two or more atoms

crystal

an orderly three-dimensional arrangement of particles

What are the two basic ways in which ions form from atoms

atoms lose or gain electrons

What holds the ions together in sodium chloride.

attractions between positive and negative ions

Why is sodium chloride electrically neutral

because sodium loses an electron which chlorine gains.

How does an ion with a charge of 2+ form

by losing two electrons

what are the properties of ionic compounds

hard brittle crystals high melting points when dissolved in water or melted they conduct electricity

subscript

number written to the lower right of a chemical symbol, tells the number of atoms in a molecule or the ratio of elements in a compound

What is the name of the ionic compound with the formula K S

potassium sulfide

What are the specific charges that are involved

sodium ion has a 1+ charge Chlorine ion has a 1- charge

Ionic bonds form as a result of ....

the attraction between positive and negative ions

ionic bond

the attractive force between two ions of opposite charge

what happens when ionic compounds form

the ions come together in a way that balances out the charges on the ions. The chemical formula for the compound reflects this balance

What information is given by the formula of an ionic compound

the ratio of positive ions to negative ions

explain how you determined this formula

two chloride ions (Cl ) are needed to balance one calcium ion (Ca )


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