Molecules, Compounds, and Chemical Equations Clicker Questions Chapter 3 Molecules, Compounds, and Chemical Equations Allison Soult University of Kentucky

The two compounds have different formulas. There are two compounds of Ni and O. The green colored oxide of nickel has a Ni:O mass ratio of 3.67:1 and a Ni:O atom ratio of 1:1. The black colored oxide of nickel has a Ni:O mass ratio of 2.45:1. Which of the following is correct? The two compounds have different formulas. The two compounds have nickel ions with different charges. The Ni:O atom ratio of the black oxide is 2:3. This is an example of the Law of Multiple Proportions. All of the above are correct. Answer: e

Which of the following compounds exhibits both ionic and covalent bonding? SO2 CF4 NaCl Na2SO4 P4O10 Answer: d

Which of the following would NOT be classified as a molecular compound? NH4C2H3O2 NH3 Answer: d

Which of the following is the correct formula for aluminum bromide? AlBr Al3Br AlBr3 Al3Br3 Answer: c

What is the IUPAC name for FeCl3? iron chloride iron trichloride iron(III) chloride iron chloride(III) Answer: c

What is the formula for potassium carbonate? KCO3 K(CO3)2 K2CO3 KCO6 Answer: c

The picture was red on sunny days and blue on rainy days. A toy used to predict the weather had a picture containing CoCl2. It worked on the following reversible reaction: CoCl2 + 6 H2O  CoCl2 ∙ 6 H2O Which of the following statements is correct? The picture was red on sunny days and blue on rainy days. The picture was blue on sunny days and red on rainy days. Answer: b

Which of the following correctly matches the formula with its name? P2O5, phosphorus pentoxide H2O, dihydrogen monoxide NaNO3, monosodium nitrate K2O, dipotassium monoxide Fe2O3, iron(II) oxide Answer: b

What is the name of the oxyacid formed from sulfite (SO32−)? hydrosulfuric acid sulfuric acid hydrosulfurous acid sulfurous acid hydrogen sulfide acid Answer: d

What is the molar mass of calcium phosphate? 310.18 g/mole 230.02 g/mole 324.99 g/mole 135.05 g/mole 214.18 g/mole Answer: a

Which sample represents the greatest number of moles? 44.01 g CO2 1.0 moles C3H8 6.022 x 1023 molecules C4H10 18.02 g H2O All of the samples have the same number of moles. Answer: e

Which of the following contains the largest number of molecules? 10.0 g CH4 10.0 g C2H6 10.0 g SO2 10.0 g Xe Answer: a

Which of the following contains the largest mass percent hydrogen? 10.0 g CH4 10.0 g C2H6 10.0 g H2O 10.0 g H2S Answer: a

Calculate the number of carbon atoms in 25 Calculate the number of carbon atoms in 25.0 grams of isopropyl alcohol (C3H8O). 1.25 C atoms 15.0 C atoms 2.51 x 1023 C atoms 7.52 x 1023 C atoms 2.07 x 10–24 C atoms Answer: d

An unknown compound contains the following percents by mass: C: 60 An unknown compound contains the following percents by mass: C: 60.86%, H: 5.83%, O: 23.16%, and N: 10.14%. Find the empirical formula. C6H8O2N2 C7H8O2N C6H8O2N C8H8O2N C8H8ON Answer: b

What is the empirical formula of a compound containing C, H, and O if combustion of 3.69 g of the compound yields 5.40 g of CO2 and 2.22 g of H2O? CH3O C2H3O CHO C2H3O2 CH2O Answer: e

What are the coefficients for the decomposition of nitroglycerin? __ C3H5N3O9  __ N2 + __ CO2 + __ H2O + __ O2 2,3,6,2,1 2,3,6,5,1 4,6,12,10,12 4,3,12,10,1 4,6,12,10,1 Answer: e

The mass of the reactants is equal to the mass of the products. Which of the following statements is true about a balanced chemical reaction? The mass of the reactants is equal to the mass of the products. The number of each type of atom is the same in the reactants and in the products. The moles of each type of atom is the same in the reactants and in the products. All of the above. Answer: d

Hydrocarbons are composed of just the elements carbon and hydrogen Hydrocarbons are composed of just the elements carbon and hydrogen. Which of the following compounds has all single bonds? naphthalene, C10H8 propane, C3H8 ethyne, C2H2 ethene, C2H4 Answer: b