chemistry ch.7

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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


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