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Chapter 5 - The Structure of Matter
3 - Compound Names and Formulas Questions
16
Science
9th Grade
11/15/2010

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Cards

Term
Names of _______ include the elements of which they are composed.
Definition
Cations
Term
Names of _______ are altered names of elements. Give an example.
Definition
Element name: Flourine, F
Ion name: Flouride, F-
Term
Some compounds such as transition metals are made up of the same ions but the cations have different charges. What must follow the cation name to make this distinction? Give an example.
Definition

Roman numerals showing the cation's charge.

Copper(I) ion, CU+

Copper(II) ion, CU2+

Term
Ionic compounds have a total charge of what?
Definition
Zero
Term
What is the cation charge of Fe2O3 if one oxide ion has a charge of 2-? 
Definition
The three oxide ions would then total 6- and since the ionic compound charge must be zero, then the two Fe ions must be 6+ so each Fe ion has a 3+ charge.
Term

Using Tables 3, 4 and 5 from pgs 158-160, write the Ionic formulas for the following:

lithium oxide

beryllium chloride

titanium(III) nitride

cobalt(III) hydroxide

Definition

Li2O

BeCl2

TiN

Co(OH)3

Term
How are covalent compounds named?
Definition

Numerical prefixes tell how many atoms of each element are in the molecule.

Whichever  element is farther to the right in the periodic table is named second and ends in -ide.

Term

List the prefixes used in naming covalent compounds.

Definition

1. mono-      6. hexa-

2. di-            7. hepta-

3. tri-            8. octa-

4. tetra-        9. nona-

5. penta-      10. deca-

Term
A compound's simplest formula is it's _________________.
Definition
Empirical formula
Term
Name 3 different compounds that have the same empirical formula.
Definition
Formaldehyde, acetic acid, and glucose all have the empirical formula of CH20
Term
What kind of formula differentiates between compounds which have the same empirical formula?
Definition
Molecular formula
Term
Can a compound's molecular and empirical formulas be the same?
Definition
Yes for example water is the same H2O
Term
Why must roman numerals be included in the names of some compounds?
Definition
Compounds with the same elements but which have different charges on their cations must show the cations' charge as roman numerals following the cation element name.
Term
When naming ionic compounds, which comes first, the cation or the anion?
Definition
The cation, then the anion.
Term
One type of formula tells relative numbers of atoms whereas the other type tells the actual numbers of atoms; what are the names of the formulas and which is which?
Definition
Empirical tells relative numbers and molecular tells actual numbers.
Term
What type of compounds have both empirical and molecular formulas?
Definition
Covalent compounds
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