Homework #2 -Chem

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Predict the chemical formula for the ionic compound formed by NH₄⁺ and PO₄³⁻

(NH₄)₃PO₄

How many oxygen atoms are in 32 molecules of dinitrogen tetroxide, N₂O₄?

128

What is the mass number for an atom of Xenon containing 54 protons and 80 neutrons?

134

How many protons are in an atom of Fe?

26

How many hydrogen atoms are in three formula units of ammonium benzoate, C₆H₅COONH₄?

27

What is the atomic number for an element whose mass number is 78 and contains 46 neutrons?

32

What is the mass number of Zinc-68?

68

Predict the chemical formula for the ionic compound formed by the elements Al and I.

AlI₃

Provide the correct IUPAC name for AlBr₃.

Aluminum Bromide

Provide the correct IUPAC name for AlI₃

Aluminum Iodide

Provide the correct IUPAC name for Al₂O₃.

Aluminum Oxide

Predict the chemical formula for the ionic compound formed by the ions Ba²⁺ and C₂H₃O₂⁻.

Ba(C₂H₃O₂)₂

Write the chemical formula for Barium Hydroxide Octahydrate

Ba(OH)₂•8H₂O

Provide the correct IUPAC name for BaCl₂.

Barium Chloride

Write the chemical formula for Carbon Tetrafluoride

CF₄

Glucose is an important biological molecule with the molecular formula C₆H₁₂O₆. What is its empirical formula?

CH₂O

Write the chemical formula for Carbon Disulfide

CS₂

Predict the chemical formula for the ionic compound formed by the ions Ca²⁺ and CO₃²⁻

CaCO₃

Write the chemical formula for Calcium Chloride Dihydrate

CaCl₂•2H₂O

Provide the correct IUPAC name for CaH₂.

Calcium Hydride

Provide the correct IUPAC name for CrBr₃.

Chromium (III) Bromide

Provide the correct IUPAC name for CrF₄.

Chromium (IV) Fluoride

Which of the following compounds does NOT exhibit covalent (molecular) bonding?

CoCl₂

Provide the correct IUPAC name for CoCl₂.

Cobalt (II) Chloride

Provide the correct IUPAC name for CoO.

Cobalt (II) Oxide

Provide the correct IUPAC name for CoS.

Cobalt (II) Sulfide

Provide the correct IUPAC name for Cu₃P.

Copper (I) Phosphide

Write the chemical formula for Chromium (III) Cyanide

Cr(CN)₃

Write the chemical formula for Chromium (III) Phosphate.

CrPO₄

Predict the chemical formula for the ionic compound formed by the elements Cs and P.

Cs₃P

Predict the chemical formula for the ionic compound formed by the ions Cu²⁺ and Cl⁻.

CuCl₂

Predict the chemical formula for the ionic compound formed by Cu²⁺ and P³⁻

Cu₃P₂

Write the empirical formula corresponding to C₆H₄Cl₂

C₃H₂Cl

Write the empirical formula corresponding to C₈H₁₀

C₄H₅

Write the chemical formula for Acetic Acid

HC₂H₃O₂

Write the chemical formula for Nitric Acid

HNO₃

Write the chemical formula for Carbonic Acid

H₂CO₃

Write the chemical formula for Sulfuric Acid

H₂SO₄

Which has the incorrect name-formula combination?

Iodine Trifluoride - IF

Classify the following compound as covalent (molecular) or ionic: LiBr

Ionic

Write the chemical formula for Iridium (III) Bromide Tetrahydrate

IrBr₃•4H₂O

Provide the correct IUPAC name for IrO₂.

Iridium (IV) Oxide

Provide the correct IUPAC name for Fe₃P₂.

Iron (II) Phosphide

Which has the incorrect name-formula combination?

Iron (III) Hydroxide - Fe₃OH

Provide the correct IUPAC name for Pb₃N₂.

Lead (II) Nitride

Which has the correct name-formula combination?

Manganese (II) Sulfide - MnS

Provide the correct IUPAC name for (Hg₂)₃P₂

Mercury (I) Phosphide

Provide the correct IUPAC name for Hg₂S.

Mercury (I) Sulfide

Provide the correct IUPAC name for HgCl₂.

Mercury (II) Chloride

Classify the following compound as covalent (molecular) or ionic: P₂O₅

Molecular

Write the chemical formula for Nitrogen Trichloride

NCl₃

Predict the chemical formula for the ionic compound formed by the ions Na⁺ and SO₄²⁻.

Na₂SO₄

Provide the correct IUPAC name for NiN.

Nickel (III) Nitride

Write the chemical formula for Dinitrogen Monoxide

N₂O

Which two particles of the atom have nearly identical masses?

Proton and Neutron

The nucleus of an atom contains?

Protons and Neutrons

Write the chemical formula for Diphosphorus Pentoxide

P₂O₅

Provide the correct IUPAC name for Rb₃N.

Rubidium Nitride

What element with a mass number of 100 has 56 neutrons in its nucleus?

Ruthenium (Ru)

Write the chemical formula for Sulfur Tetraiodide

SI₄

Provide the correct IUPAC name for Ag₂O

Silver Oxide

Which is not one of Dalton's Hypotheses of atomic theory?

The atoms of one element are the same as atoms of another element.

The Millikan Oil drop experiment determined?

The charge of the electron.

The Cathode ray tube experiment determined?

The existence of electrons.

When methane is completely combusted in oxygen forming carbon dioxide and water, how does the mass of the reactant gases compare to the products?

The masses of the reactants and products are equal.

The atomic mass of Germanium (Ge) on the periodic table is 72.630 amu. Which of the following best explains why the atomic mass is a fraction between 72 and 73?

The presence of different isotopes.

Atoms from which of the following pairs are most likely to form an ionic bond?

Titanium and Oxygen

What does the mass number of an atom represent?

Total number of Protons and Neutrons in the atom.

What is the atomic symbol and mass number for an atom containing 50 protons and 64 neutrons?

¹¹⁴Sn

There are two naturally occurring isotopes of Europium, ¹⁵¹Eu (151.0 amu) and ¹⁵³Eu (153.0 amu). If the atomic mass of Eu is 151.96, what is the approximate natural abundance of ¹⁵¹Eu?

50%

An unknown element X has the following isotopes: ⁵²X (84.50% abundant), ⁴⁹X (8.00% abundant), ⁵⁰X (7.50% abundant). What is the approximate atomic mass of X?

51.6 amu

Write the chemical formula for Chromium (VI) Sulfate.

Cr(SO₄)₃

In an experiment, the reaction of 100.0g of Iodine produced 144.9g of a compound formed from Iodine and Fluorine. a. What mass of Fluorine was consumed in the reaction? b. What is the mass ratio of Iodine to Fluorine in the compound? c. Given that the mass ratio of Iodine to Fluorine is 2.23, what is the mass in grams of this compound would be expected to form in the same experiment if you started with 85.2g of Iodine?

a. 44.9 g b. 2.23 c. 123.4g

The empirical formula of a covalent compound is CH₂. Which of the following is NOT a possible chemical formula for this compound?

C₆H₁₀

Provide the correct IUPAC name for CoN.

Cobalt (III) Nitride


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