University:
Kentucky State University
Course:
CHE 101 | General Chemistry I
Academic year:

2024
Views:

436

Pages:

3
Author:

Lily Callahan

**Department of Chemistry** **General Chemistry, Chem. 101** **First Exam** **#2** **Name:** **Student ID No.:** **Lecture time:** **Instructor:** **Serial No.:** **Periodic Table** [Image of the periodic table with elements and atomic numbers] **Useful Information** * °F = (9/5)°C + 32 * °C = (°F - 32) * 5/9 * 1 mile = 5280 feet * 1 foot = 12 inches * 1 inch = 2.54 cm * 1 pound (lb) = 453.59237 g * Avogadro's number = 6.022 x 10^23 **Choose the correct answer and put your choices in the suitable places in the table below.** | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | | | | | | | | | | | | | | | | | 1-Below is a list of common prefixes used in the SI and metric systems. abbreviation and meaning. Which set contains an error? will each is an a) mega-m 106 b) micro- µ 106 c) deci- d 10¹ d) kilo- k 10³ 2- Which of the following represents 0.0000009853 g in scientific notations? a) 9.853 x 10° g b) 9.853 x 10" g c) 9.853 x 10 g 6 3- Round 0.1605585 to four significant figures. a) 0.1615 b)0.1605 c)0.1606 4- Convert 10 micrometers to inches a) 5.5× 103 b) 7.1× 10 5- Convert-200 °F to Kelvin. a) -128.89 b) 144.26 6- An atom of the "Si isotope contains: a) 14 electrons +14 protons +15 neutrons b) 15 electrons +15 protons +14 neutrons d) 0.1615 c) 3.9x 10 c) -71.60 d) 9.853 × 107 g d) 6.8× 10 d) 179.82 c)14 electrons +15 protons +14 neutrons d) 14 electrons +14 protons +29 neutrons 7- Which of the following concepts refers to degree of agreement among several measurements of the same quantity? a) Accuracy b) Precision c) Random errors 8- Which of the following statements is incorrect? a) Ions that possess a negative charge are called anions. b) lons that possess a positive charge are called cations. c) Covalent bonds result from attraction between oppositely charged ions d) A molecule of potassium chloride, KCl, consists of one K'ion and one Clion 9- What is the formula for manganese(III) oxide? a) Mn₂O b) MnO 10- What is the name of Na₂SO₄? a) Sodium sulfite b) Sodium sulfate c) MnOj d) Mn2O3 d) Systematic errors c) Sodium (II) sulfite d) Sodium (II) sulfate 11-The following formula represents nitrous acid a) H₂NO, b) HNO3 c) HNO2 d) HNO2 12- What are the percent compositions of Ethyne (C₂H₂) (molar mass 26.04 g/mol)? a) 92% Carbon and 8% Hydrogen b) 82% Carbon and 18% Hydrogen c) 83% Carbon and 17% Hydrogen d) 90% Carbon and 10% Hydrogen 13- The empirical formula for a compound that contains 37.69g Na and 62.31g Fluorine is: a) NaF3 b) Na₂F c) NaF d) NaF2 14- How many Ge atoms are in 4.0g Ge? a) 2.3x 102 b) 4.3 × 1023 c) 3.3 x 1022 d) 5.2 x 1022 15- How many grams of KBrO3(Mwt. 167 g/mol)are required to prepare 0.07 moles of Br2 according to the following reaction: KBrO3+5KBr+6HNO3→ 6KNO3 + 3Br2+3H2O a) 3.7 g b) 3.9 g c) 3.3 g d) 3.5 g 16- In the reaction: Zn+2HCl→ZnCl2+H2 35.0 g of Zn are reacted with 18.5 g of HCl. How many grams of H₂ will be produced? a)0.50g b) 1.08g c) 0.25g d)1.12g