Chemistry Ch2 PRACTICE TEST

An unknown element X has the following isotopes: ²⁵X (80.5% abundant) and ²⁷X (19.5% abundant). What is the average atomic mass in amu of X?

25.4 amu

How many protons are in an atom of Co?

27

Write the chemical formula for silver chloride

AgCl

What is the mass number for an atom of xenon containing 54 protons and 75 neutrons?

129

How many protons (p) and electrons (e) are found in a Se²⁻ ion? A) 34 p, 36 e B) 34 p, 32 e C) 32 p, 34 e D) 36 p, 34 e E) 34 p, 34 e

A) 34 p, 36 e

Correct name for CaH2? A. calcium hydride B. calcium hydrate C. hydrogen calcide D. hydrocalcitic acid E. hydrogen calcite

A. calcium hydride

IUPAC name for ClO2? A. chlorine dioxide B. chlorine oxide C. chlorine (IV) oxide D. chlorine (II) oxide E. monochlorine dioxide

A. chlorine dioxide

Classify the following compounds as ionic or covalent: KCl, CrCl₃, Cl₂O. A) Ionic, covalent, covalent. B) Ionic, ionic, covalent. C) Covalent, covalent, ionic. D) Ionic, covalent, ionic.

B) Ionic, ionic, covalent.

Which of the following sets of elements and symbols is paired correctly? A) rubidium, Ru B) indium, In C) thallium, Tm D) francium, Fm E) astatine, As

B) indium, In

What is the correct IUPAC name for BaS?

Barium sulfide

Chemical formula for barium hydroxide? A. BaO B. Ba2(OH)3 C. Ba(OH)2 D. Ba2OH E. BaOH

C. Ba(OH)2

Chemical formula for calcium sulfite? A. CaSO2 B. CaSO3 C. CaSO4 D. Ca(SO3)2 E. Ca(SO4)2

CaSO3

Write the chemical formula for the chlorite ion

ClO2-

What is the correct IUPAC name for Cu₂S?

Copper (I) Sulfide

The halogens are found in Group ____ A) 1A (1) B) 2A (2) C) 6A (16) D) 7A (17) E) 8A (18)

D. 7A(17)

Which postulate(s) of Dalton's atomic theory of matter is/are NOT true? A) Atoms of a given element are identical B) Atoms are indestructible C) Atoms combine in simple ratios to form compounds D) Both (A) and (B)

D. Both A and B

Columns on the periodic table are known as A) Periods B) Halogens C) Metals D) Groups E) Metalloids

D. Groups

Chemical formula for dinitrogen tetroxide? A. N2O B. N2O2 C. N2O3 D. N2O4 E. N2O5

D. N2O4

IUPAC name for MgI2? A. magnesium dioxide B. magnesium diiodide C. magnesium (II) iodide D. magnesium iodide E. magnesium (I) iodide

D. magnesium iodide

What is the correct IUPAC name for S₂F₈?`

Disulfur Octafluoride

Which of the following is most likely to form a +2 ion? A) K B) Sc C) Al D) O E) Mg

E) Mg

Predict the chemical formula for the ionic compound formed by Fe³⁺ and O²⁻

Fe2O3

Chemical formula for chlorous acid? A. HClO4 B. HClO3 C. HClO2 D. HClO E. HCl

HClO2

What is the correct IUPAC name for Fe₃P₂?

Iron (II) phosphide

Predict the chemical formula for the ionic compound formed by the elements K and S

K2S

What is the correct IUPAC name for Mg₃(PO₄)₂?

Magnesium phosphate

Write the chemical formula for the ammonium ion

NH4+

What is the correct IUPAC name for HNO₃(aq)?

Nitric acid

What is the correct IUPAC name for HNO₂(aq)?

Nitrous acid

What is the correct IUPAC name for H₃PO₄(aq)?

Phosphoric acid

The empirical formula of a covalent compound is CH₂. Which of the following is NOT a possible chemical formula for this compound? A) C₅H₁₀ B) C₇H₁₄ C) C₆H₁₀ D) C₄H₈ E) C₃H₆

C. C6H10

The symbol Cd represents the element _____ A) carbon B) calcium C) cadmium D) californium E) cesium

C. Cadmium

Correct formula for potassium carbonate? A. KCO4 B. KCO3 C. K2CO3 D. K (CO3)2 E. K2CO4

C. K2CO3

Which scientist determined the charge of the electron? A) John Dalton B) J. J. Thomson C) Robert Millikan D) Ernest Rutherford E) James Chadwick

C. Robert Milikan

IUPAC name for (NH4)2CO3? A. ammonium tricarbonate B. diammonium tricarbonate C. ammonium carbonate D. ammonium tricarbonate E. diammonium monocarbonate

C. ammonium carbonate

Chemical formula for silver sulfide? A. AgSO4 B. Ag2SO4 C. AgSO3 D. Ag2SO3 E. Ag2S

E. Ag2S

Which of the following is a main group element? A) Yttrium B) Osmium C) Holmium D) Californium E) Bismuth

E. Bismuth

Chemical formula for hydrofluoric acid? A. HFO4 B. HFO3 C. HFO2 D. H2FO4 E. HF

E. HF

Chemical formula for potassium dichromate? A. K2(CrO4)2 B. K4(CrO4)2 C. K(CrO4)2 D. KCr2O7 E. K2Cr2O7

E. K2Cr2O7

Write the chemical formula for sodium sulfite

Na2SO3

Write the chemical formula for tetraphosphorus hexasulfide

P4S6

How many oxygen atoms are in 25 molecules of dinitrogen tetroxide, N₂O₄?

100 atoms

IUPAC name for ICl3? A. iodine trichloride B. iodine chloride C. iodine (III) chloride D. iodine (I) chloride E. monoiodine trichloride

A. iodine trichloride

IUPAC name for H3PO3 as an acid? A. phosphorous acid B. hydrophosphoric acid C. hydrophosphorous acid D. phosphoric acid E. hypophosphorous acid

A. phosphorous acid

IUPAC name for ZnSO4? A. Zinc sulfate B. zinc (I) sulfate C. zinc monosulfate D. monozinc monosulfate E. zinc sulfite

A. zinc sulfate

What element with a mass number of 100 has 56 neutrons in its nucleus? A) Fermium (Fm) B) Ruthenium (Ru) C) Barium (Ba) D) Copernicium (Cn) E) Radium (Ra)

B. Ruthenium

IUPAC name for HBrO2 as an acid? A. perbromic acid B. bromous acid C. perbromous acid D. bromic acid E. hypobromic acid

B. bromous acid

IUPAC name for HI as an acid? A. periodous acid B. hydroiodic acid C. iodic acid D. hypoiodous acid E. hypoiodica acid

B. hydroiodic acid

What is the IUPAC name for SF4? A. monosulfur tetrafluoride B. sulfur tetrafluoride C. sulfur (I) fluoride D. sulfur (IV) fluoride E. sulfur fluoride

B. sulfur tetrafluoride

Rutherford's gold foil experiment determined that A) neutrons are in the nucleus. B) electrons have a negative charge. C) most of the space in an atom is empty except for a concentrated area called the nucleus. D) protons and neutrons have about the same mass. E) neutrons have no charge.

C. most of the space in an atom is empty except for a concentrated area called the nucleus.

Chemical formula for periodic acid? A. HIO4 B. HIO3 C. HIO2 D. HIO E. HI

HIO4

Write the chemical formula for nitric acid

HNO3

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? A) The presence of different isotopes B) The presence of different isomers. C) The formation of different ions. D) The presence of different allotropes. E) The presence of different amounts of protons.

A. The presence of different isotopes

Glucose is an important biological molecule with the molecular formula C₆H₁₂O₆. What is its empirical formula? A) CHO B) CH₂O C) C₂HO₂ D) C₆H₁₂O₆ E) Not enough info

B. CH2O

Which two particles of the atom have nearly identical masses? A) Proton and electron B) Proton and neutron C) Neutron and electron D) No two particles have similar masses

B. Proton and neutron

The nucleus of an atom contains: A) Protons and electrons B) Protons and neutrons C) Electrons and neutrons D) Protons, neutrons and electrons E) Electrons only

B. Protons and neutrons

IUPAC name for K2O? A. potassium peroxide B. dipotassium monoxide C. potassium oxide D. dipotassium oxide E. potassium (II) oxide

C. potassium oxide

IUPAC name for SO3? A. Sulfur (VI) oxide B. sulfur (III) oxide C. sulfur trioxide D. sulfur oxide E. monosulfur trioxide

C. sulfur trioxide

The element symbol for potassium is _____ A) P B) Po C) K D) Kr E) Pa

C.K

Chemical formula for sodium hypochlorite? A. NaCl B. NaClO4 C. NaClO3 D. Na2ClO2 E. NaOCl

E. NaOCl

What does the mass number of an atom represent? A) number of neutrons in the atom B) number of protons in the atom C) atomic mass of the element D) total number of electrons and neutrons in the atom E) total number of protons and neutrons in the atom

E. Total number of protons and neutrons in the atom

What is the formula for an ionic compound containing Ba²⁺ ions and Cl⁻ ions? A) BaCl B) Ba₂Cl C) BaCl₂ D) BaCl₃ E) Ba₃Cl

BaCl2

IUPAC name for H2S as an acid? A. sulfuric acid B. sulfurous acid C. hydrosulfuric acid D. hydrosulfurous acid E. disulfuric acid

C. hydrosulfuric acid