chemistry ch.7
What is the oxidation number of hydrogen in H2O?
+1
What is the oxidation number of oxygen in H2O2?
-1
what is the oxidation number for hydrogen in compounds containing metals?
-1
What is the oxidation number of oxygen in CO2?
-2
What is the oxidation of a pure element?
0
What is the mass of 0.240 mol glucose, C6H12O6
0.240 x 180.24=43.2 g
The molar mass of NH3 is 17.03 g/mol. How many moles of NH3 are present in 107.1 g?
6.289 mol
The molar mass of CS2 is 76.15 g/mol. How many grams of CS2 are present in 10.00 mol?
761.5 g
The correct formula for ammonium phosphate is A. (NH4)3PO4. B. (NH4)2PO4. C. NH4PO4. D. NH4(PO4)2.
A. (NH4)3PO4.
The molecular formula for acetylene is C2H2. The molecular formula for benzene is C6H6. The empirical formula for both is A. CH. B. C2H2. C. C6H6. D. (CH)2.
A. CH.
C2H3O2^1-
Acetate
What is the formula for aluminum sulfate?
Al2SO4
NH4^1+
Ammonium
Which of the following shows the percentage composition of H2SO4? A. 2.5% H, 39.1% S, 58.5% O B. 2.1% H, 32.7% S, 65.2% O C. 28.6% H, 14.3% S, 57.1% O D. 33.3% H, 16.7% S, 50% O
B. 2.1% H, 32.7% S, 65.2% O
Which of the following is the correct formula for iron(III) sulfate? A. Fe3SO4 B. Fe3(SO4)2 C. Fe2(SO4)3 D. 3FeSO4
C. Fe2(SO4)3
Which of the following compounds has the highest percentage of oxygen? A. CH4O B. CO2 C. H2O D. Na2CO3
C. H2O
The empirical formula for a compound that is 1.2% H, 42.0% Cl, and 56.8% O is A. HClO. B. HClO2. C. HClO3. D. HClO4.
C. HClO3
When writing the formula for a compound that contains a polyatomic ion, A. write the anion's formula first. B. use superscripts to show the number of polyatomic ions present. C. use parentheses if the number of polyatomic ions is greater than 1. D. always place the polyatomic ion in parentheses.
C. use parentheses if the number of polyatomic ions is greater than 1.
ClO3^1-
Chlorate
Which of the following compounds does not contain a polyatomic ion? A. sodium carbonate B. sodium sulfate C. sodium sulfite D. sodium sulfide
D. sodium sulfide
OH^1-
Hydroxide
oxidation numbers
In order to indicate the general distribution of electrons among the bonded atoms in a molecular compound or a polyatomic ion
What type of compound cannot be represented by a molecular formula? Explain
Ionic compound because it is not made up of molecules
What is the formula for dinitrogen trioxide?
N2O2
Name the compound Ni(ClO3)2......
Nickel (II) chlorate
Name the compound N2O2 using the stock system....
Nitrogen (II) oxide
What is the formula for sulfur dichloride?
SCl2
What is the formula for the compound sulfur (II) chloride?
SCl2
In a stock system name such as iron (III) sulfate, the Roman numeral tells us.....
The charge on each Fe ion
percentage composition
The percentage by mass of each element in a compound
What are Stock system names based on?
What are Stock system names based on?
Name the compound Zn3(PO4)2.....
Zinc phosphate
The correct name for NH4CH3COO is A. ammonium carbonate. B. ammonium hydroxide. C. ammonium acetate. D. ammonium nitrate
ammonium acetate.
salt
an ionic compound composed of a cation and the anion from an acid is often referred to as a salt
oxidation states
are assigned to the atoms composing the compound or ion
.......are composed of metals and nonmetals, typically opposite sides of the periodic table.
binary ionic compounds
Name the compound CCl4 using the stock system...
carbon (IV) chloride
CO3^2-
carbonate
Changing a subscript in a correctly written chemical formula....
changes the formula so that it no longer represents the compound it previously represented
CrO4^2-
chromate
binary compounds
compounds composed of two elements
empirical formula
consists of the symbols for the elements combined in a compound. With subscripts showing the smallest whole-number mole ratio of the different atoms in the compound.
CN^1-
cyanide
Name the molecular compound N2O3.....
dinitrogen trioxide
What is the sum of the atomic masses of all the atoms in a formula for a compound?
formula mass
Grams-moles
grams x 1/molar mass = moles
HCO3^1-
hydrogen carbonate
The molar has of an element is the mass of one...
mole of the element
moles-molecules
moles x 6.022 x 10^23= molecules
moles-grams
moles x molar mass =grams
Ions formed from a single atom
monatomic ions
nomenclature
naming system
NO3^1-
nitrate
What is the stock system name for NO2?
nitrogen (II) Oxide
covalently bonded binary molecular compounds are typically composed of.....
nonmetals
formula mass
of any molecule, formula unit, or ion is the sum of the average atomic masses of all atoms represented in its formula
C2O4^2-
oxalate
MnO4^1-
permanganate
PO4^3-
phosphate
oxyanions
polyatomic ions that contain oxygen
SO4^2-
sulfate
Name the molecular compound for SO3....
sulfur trioxide
molar mass =
sum of all atomic mass
The subscripts in a chemical formula indicate....
the number of atoms that are combined in the compound