What do I remember from Chemistry Class? Formative assessment

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What do I remember from Chemistry Class? Formative assessment 1) There are 45 multiple choice questions. Read all questions carefully! This test should take you about 70 minutes.

1 What do I remember from Chemistry Class? Formative assessment 1) There are 45 multiple choice questions. Read all questions carefully! This test should take you about 70 minutes. 2) As there is NO penalty for incorrect answers, make sure you answer ALL questions! 3) Avogadro s number is 6.02 x ) This is a formative test. This DOES NOT COUNT FOR MARKS! This test is to give yourself and the instructor an indication of what your chemistry skill level is and what you need to work on. Now turn the page. Good luck! 1

2 1) 1400 m is equal to A) 14 cm C) 1.4 km B) 1.4 mm D) Mm 2) Which of the following has an indefinite number of significant figures? A) height = 1.85 m C) weight = 1.2 kg B) 60 sec = 1 min D) all of the above 3) 4.25 multiplied by 2.3 is A) C) 9.8 B) 9.78 D) 10 4) equals A) C) 4.12 B) D) 4.1 5) A mass is known to be 1.00 kg. Its mass is measured four times. Choose the letter corresponding to the correct examples of accurate and precise measurements Accurate measurements (kg) Precise measurements (kg) A) 0.90, 1.0, 1.2, , 1.01, 1.02, 1.02 B) 0.90, 1.0, 1.0, , 0.91, 0.91, 0.91 C) 0.91, 0.92, 0.94, , 0.87, 0.96, 1.15 D) 0.99, 1.00, 1.01, , 0.91, 1.20,

3 6) Choose the letter corresponding to the correct examples of qualitative and quantitative information Qualitative information Quantitative information A) Tall 6 5 / 200 cm B) Tall, short Very tall, very short C) 6 5 / 200 cm Tall, short D) 6 5 / 200 cm / cm Note: means feet means inches 7) Which of the following is an example of a heterogeneous mixture? A) tap water C) vinaigrette B) an iron nail D) flat beer 8) Which of the following is an example of a phase change A) melting C) burning B) dissolving D) filtration 9) The formula for disulfur hexaoxide is A) S2O4 C) S2O6 B) S3O6 D) S3O8 10) The mass of 1.15x10 21 atoms of K2CO3 is A) 2.64x10-1 g C) 7.23x10 4 g B) 1.59x10 23 g D) 1.38x10-2 g 11) What is the molar mass of Co(CH3COO)2? A) g/mol C) g/mol B) g/mol D) g/mol 3

4 12) What is the volume occupied by 2.3 mol of C3H8 gas? A) 0.10 L C) 9.7 L B) 52 L D) 2.3 L 13) The number of oxygen atoms in 2.80 L of SO2 at STP is A) 6.02x10 23 C) 7.52x10 22 B) 1.50x10 23 D) 4.52x ) Which of the following chemical reactions is an example of single replacement? A) 2H2 + O2 2H2O C) HCl + NaOH NaCl + H2O B) 2H2O2 2H2O + O2 D) 2NaCl + F2 2NaF + Cl2 15) Consider the following reaction: Al4C3 + H2O Al(OH)3 + CH4 The missing coefficients are: A) 1,12 4,3 C) 1,6 4,1 B) 0,6 4,3 D) 1,6 4,3 16) Aluminum oxide and sulfuric acid produce water and aluminum sulfate. When this reaction is written and balanced, the coefficients (from left to right) are: A) 2,3 3,2 C) 1,3 3,2 B) 1,3 3,1 D) 2,3, 3,2 17) 3A2B5 + 10C(DE2)3 6A(DE2)5 +? The coefficient and formula for the missing product is: A) 5C2B3 C) 25CB B) CB5 D) 3C2B5 18) CH4 + 2O2 CO2 + 2H2O + heat This equation represents a reaction which is: A) endothermic C) both endothermic and exothermic B) exothermic D) neither endothermic and exothermic 4

5 19) Consider the following reaction: 4CH3NO2 + 3O2 4CO2 + 6H2O +2N2 What mass of H2O is produced when g of CH3NO2 is reacted with excess O2? A) g C) g B) g D) g 20) Consider the following reaction: HCl + NaOH NaCl + H2O What is the concentration of NaOH if 12.0 ml of NaOH reacts completely with 8.9 ml of 1.50 M HCl? A) 0.64 M C) 1.1 M B) 0.91 M D) 2.0 M The following equation refers to question 21 and 22 3Cu + 8HNO3 3Cu(NO3)2 +2NO + 4H2O 21) If 45.0 g of Cu is reacted with 108 g of HNO3, what mass of the excess reactant will be left over? A) 4.18 g C) 4.89 g B) 4.50 g D) 6.12 g 22) If 45.0 g of Cu is reacted with 108 g of HNO3, what mass of NO will be produced? A) 4.89 g C) 27.0 g B) 12.9 g D) 51.4 g 23) What is the electron configuration for K? A) 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 C) 1s 2 1p 6 2s 2 2p 6 3s 2 3p 6 4s 1 B) 1s 2 2s 2 3p 6 4s 2 5p 6 6s 1 D) 1s 2 2p 8 3p 8 4p 1 24) How many valence electrons in an atom of Aluminum (Al)? A) 1 C) 3 B) 2 D) 5 5

6 25) Which of the following is the most probable Lewis electron dot diagram for a compound of nitrogen and hydrogen? A) C) H B) H : N : H D) H 26) How many elements belong to the halogen family? A) 4 C) 6 B) 5 D) 8 27) A beaker contains a mixture of Ca 2+, Fe 2+, and Sr 2+. Which of the following compounds would precipitate only one of the ions present? A) NaCl C) Na2S B) Na2SO4 D) NaOH 28) Which of the following is NOT a type of Van der Waals force? A) London forces C) covalent bonds B) hydrogen bonds D) dipole-dipole forces 29) Why is CH4 a nonpolar molecule? A) its bonds are all nonpolar C) C and H have the same electronegativity B) it doesn t have covalent bonds D) its bond dipoles cancel out 30) Molarity is defined as: A) Moles of solute / litres of solvent C) Moles of solute / litres of solution B) Mass of solute / litres of solvent D) Mass of solute / litres of solution 31) What is the concentration of CO3 2- present in 1.5 M Na2CO3? A) 0.75 M C) 3.0 M B) 1.5 M D) 4.5 M 6

7 32) What is the concentration of K + formed when mol of K2SO4 is put into 40.0 ml? A) 6.3x10-2 M C) 6.3x10-5 M B) 1.3x10-1 M D) 1.3x10-4 M 33) What is the [NaCl] when 2.56 g of NaCl is dissolved in 1.4 L? A) 3.1x10-2 M C) 1.8 M B) 1.6x10 1 M D) 6.1x10-2 M 34) What is the concentration of Li + when 30.0 ml of 1.00 M LiBr is added to 40.0 ml of 2.00 M KCl? A) M C) M B) M D) M 35) What is the Cl - concentration when ml of 1.00 M NaCl is mixed with ml of 1.5 M CaCl2? A) 1.17 M C) 2.33 M B) 3.33 M D) 1.67 M 36) Which of the following is NOT an organic molecule? A) HCOOH C) C3H5OH B) SO2 D) C5H9Br 37) Which of the following is the correct structure for 2-bromo-1-butanol? A) C) B) D) 7

8 38) What is the correct name for the following molecule? C-C-C C-C-C-C-C-C-C Cl C-C-C A) 3-chloro-3,5-dipropylheptane C) 4-chloro-4-ethyl-6-propyloctane B) 3-chloro-5-ethyl-3-propyloctane D) 4-chloro-4,6-diethylnonane 39) Which of the following is a structural isomer of 4-ethyl-2-methylheptane A) 2,2,3-trimethylhexane C) 4,4-dipropylheptane B) 3-ethyl-2,2,4-trimethylpentane D) 3-ethyl-2,2,5,5-tetramethylhexane 40) What is the functional group present on the following molecule? O C-C-C-C-C \ O-C-C A) carboxylic acid C) ether B) amide D) ester 41) Which of the following shows the 0.100M solutions arranged from the solution with the lowest ph to solution with the highest ph? a) Na2CO3, KCH3COO -, HBr b) Na2CO3 HBr, KCH3COO -, c) HBr, KCH3COO -, Na2CO3 d) none of the above 42) The [H3O + ] of a solution is 2.6x10-5 M. What is the poh of the solution? a) 4.59 b) 4.6 c) 9.41 d) 9.4 8

9 43) 25.0mL of 0.100M sulphuric acid solution is mixed with 50.0mL of 0.100M potassium hydroxide solution. The resulting solution will be a) neutral b) acidic c) basic d) none of the above 44) Consider the following equilibrium system:2kclo3(s) <-> 2KCl(s) + 3O2(g) Which of the following is the equilibrium constant expression? A. Keq = [O2] 3 B. Keq = 1 C. Keq = [KClO3] 2 D. Keq = [KCl] 2 [O2] 3 [O2] 3 [KCl] 2 [O2] 3 [KClO3] 2 9

2 nd Semester Study Guide 2017

Chemistry 2 nd Semester Study Guide 2017 Name: KEY Unit 6: Chemical Reactions and Balancing 1. Draw the remaining product 2. Write a balanced equation for the following reaction: The reaction between sodium