CHM Exam 2 Chapter 5
Which is the correct formula for ammonium dichromate?
(NH4)2CR2O7
What is the difference between a molecular and an ionic compound?
*Ionic: contain 1 or more cations paired with 1 or more anions *Molecular: formed from 2 or more non-metals
How many hydrogen atoms are in the formula for ammonium phosphate, (NH4)3PO4?
12 - (4 X 3)= 12
What is the formula mass of sodium sulfite (Na2SO3)?
126.0 amu Multiply atomic mass of each element by the number of molecules and add up value of each Na (22.98 X 2) + O (15.9994 X 3) + S (32.056)
What is the total number of atoms in a molecule of glucose, C6H12O6?
24
How many nitrogen atoms are in the formula for ammonium phosphate, (NH4)3PO4?
3
What is the carbon to hydrogen mass ratio of methane (CH4)?
3:1
How many different kinds of atoms are in a molecule of penicillin, C14H20N2SO4?
5
The mass ratio of lead to sulfur in lead(II) sulfide is 270.0 g lead to 41.8 g sulfur. How much lead is required to completely react with 85.6 g of sulfur?
85.6 X (1 mol/32.07 g S) X (207.2 g Pb/ 1 mol)= 721 g
How do you name oxyanions?
According to their number of Oxygen atoms * More O atoms= -ate ending * Less O atoms= -ite ending
What is an oxyanion?
An anion containing 1 or more Oxygen atoms; polyatomic
What element is a diatomic gas at room temperature?
Chlorine
What is the difference between compounds and mixtures?
Compounds have fixed proportions while mixtures do not
How is the compound I2O5 named?
Diiodine pentoxide
What is the basic unit of ionic compounds
Formula units
The name of the compound HCl(g) is
Hydrochloric acid
The name of the compound HCN(aq) is
Hydrocyanic acid
Name the following polyatomic ions in their listed order: OH-, CO3 2-, and PO4 3
Hydroxide, carbonate, phosphate
Aluminum carbonate is considered which of the following?
Ionic compound
The name of the compound Fe2O3 is
Iron (III) oxide
What is the formula of the compound formed from lithium and nitrogen
Li3N
Give an example of an atomic element
Mercury
What is the correct formula for dinitrogen tetrahydride?
N2H4
What is the formula of the ammonium ion?
NH4+
Which of the following are polyatomic ions
NH4+, NO3- * Ion has to have a charge in order to be polyatomic*
Write the chemical formula of the compound containing 2 phosphorus atoms and 5 oxygen atoms.
P2O5
The name of the compound Pl3 is...
Phosphorous triiodide
The name of the compound AgCl is
Silver chloride
Identify the formulas of the following oxyanions in their correct order: sulfate ion and sulfite ion
Sulfate: SO2-4 Sulfite: SO2-3
Formula Mass
Sum of the atomic masses of all atoms in its chemical formula
What are the basic units of the compound sodium chloride?
molecule * Na (sodium) and Cl (chlorine)
What is the name of HNO2 (aq)?
nitrous acid
Molecules
the smallest identifiable units of chemical compounds