chapter 7 Flashcards
(31 cards)
what is a chemical formula?
indicates the relative number of atoms of each kind in a chemical compound.
what does the chemical formula for an ionic compound represent and how does it relate to cations and anions?
the chemical formula for an ionic compound shows one formula unit the simplest ratio of cations and anions.
what are monoatomic ions?
ions formed from a single atom are known as monoatomic ions.
the non-metals of group ____,_____, and ______ gain electrons to form anions.
15,16, and 17.
how are monoatomic cations identified?
first the ending of the element’s name is dropped then -ide is added to the root name.
what are binary compounds?
compounds composed of two different elements.
in __________ the total number of positive charges and negative charges must be equal.
Binary compounds.
what is the stock system of nomenclature?
a system used to distinguish ins formed by such elements that form two or more cations with different charges.
TRUE OR FALSE
The stock system of nomenclature uses roman numericals to indicate an ion’s charge.
True.
write the representation of ionic compounds.
ionic compounds=cations + anions
Group ___ and ___ lose electrons to form cations.
1,2
How to write Formula units?
1) Write the symbols of the ions side by side, placing the cation first.
2) Cross over the charges, using the absolute value of each ion’s charge as the subscript for the other ion.
3) Simplify the subscripts by dividing them by their largest common factor to get the smallest whole-number ratio of ions.
How are binary ionic compounds named?
By combining the names of the positive and negative ions.
The name of the cation is given first then the name of the anion. 𝐴𝑙2𝑂3
What are the two ways of naming molecular compound?
1) Stock system.
2) Prefix system
What does the prefix system use to indicate the number of atoms in a single molecule?
Prefixes.
Slide 9, practice page 197, table 1-3, slide 11, table 2.1, slide 30
The strategy of naming compounds.
Start by identifying what type of compound it is.
2. If 1 metal is (+ve) and 1 nonmetal (-ve), follow ionic compound naming rules.
3. If 2 nonmetals (-), follow covalent compound naming rules.
What is the rule for naming molecular compounds?
Prefix+ Name of the nonmetal + prefix+ name of the nonmetal ends with ide.
What is an acid?
A type of molecular compound.
What is an acid?
A type of molecular compound.
What are the two types of acids?
Binary acids and Oxyacids.
Binary acids that contain ____ often dissolve in water to produce acids. These solutions are named by adding the prefixes _____ to the name of the compound and then replacing the suffix ide with ___.
Hydrogen, hydro, ic
What are oxidation numbers useful for?
Naming compounds.
Writing formulas.
Balancing chemical equations.
Assigning oxidation numbers.
Page 232.
