Chem. Chapter 2 Quiz
Predict the chemical formula for the ionic compound formed by the ions Al³⁺ and C₂H₃O₂⁻. A. Al(C₂H₃O₂)₃ B. AlC₂H₃O₂ C. Al(C₂H₃O₂)₂ D. Al₃C₂H₃O₂
A.
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.
A.
Which of the following does NOT describe the element bromine (Br)? A. A metalloid B. A nonmetal C. A main group element D. A halogen
A.
Write the chemical formula for dinitrogen tetraoxide. A. N₂O₄ B. N₂O₃ C. NO D. N₂O
A.
Atoms from which of the following pairs are most likely to form an ionic bond? A. Sodium and Potassium B. Titanium and Oxygen C. Sodium and Barium D. Nitrogen and Fluorine
B.
How many electrons are in a neutral ⁴¹Ca atom? A. 2 B. 20 C. 21 D. 41
B.
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)
B.
Which of the following is a covalent compound? A. RbCl B. CO C. MgS D. TiO
B.
Which of the following sets of elements and symbols is paired correctly? A. tin, Ti B. erbium, Er C. bismuth, B D. carbon, Ca
B.
Write the chemical formula for cesium carbonate. A. CsC₂ B. Cs₂CO₃ C. Cs₃CO₂ D. CsC
B.
A molecule has an empirical formula of CH, and its molar mass is known to be 26 g/mol. What is its molecular formula? A. CH B. CH₂ C. C₂H₂ D. C₃H₃
C.
How many electrons are in a neutral carbon-14 atom? A. 2 B. 4 C. 6 D. 14
C.
What is the correct IUPAC name for Cr₂O₃? A. Dichromium trioxide B. Chromium oxide C. Chromium(III) oxide D. Chromium(II) oxide
C.
Which of the following is best classified as an ionic compound? A. S₄N₄ B. SO₃ C. ZnS D. S₂F₁₀
C.
An unknown element X has the following isotopes: ¹⁴⁰X (89.00% abundant) and ¹⁴²X(11.00% abundant). What is the average atomic mass in amu of X? A. 140.00 amu B. 141.84 amu C. 142.00 amu D. 140.22 amu
D.
How many carbon atoms are in 25 molecules of benzene, C₆H₆? A. 6 B. 25 C. 36 D. 150
D.
Predict the chemical formula for the ionic compound formed by Cu²⁺ and P³⁻. A. Cu₃P₃ B. Cu₂P₂ C. CuP D. Cu₃P₂
D.
What does the mass number of an atom represent? A. number of neutrons in the atom B. number of protons in the atom C. total number of electrons and neutrons in the atom D. total number of protons and neutrons in the atom
D.
What is the correct IUPAC name for HNO₂(aq)? A. Hydronitric Acid B. Hydrogen Nitride C. Nitric Acid D. Nitrous Acid
D.
Which of the following elements would be chemically similar to selenium (Se)? A. Br B. Sc C. As D. S E. Ca
D.