calvert gr6 lesson 36 science ionic bonds
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 )
