Trivia Race #3

1. Which model represents the law of conservation of matter?

2. Which of the following is insoluble in water? In other words, which one can be a precipitate? i) Ammonium chloride ii) Calcium chromate iii) Barium bromide iv) Copper II carbonate

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1. Which acid is the stronger acid? A. HCl B. HF 2. Which acid will have a higher pH? A. HCl B. HF NOTE: Must answer as a combination answer. Example: AA, AB, BB, or BA. #11

#12 What is the pH of a solution that has a hydronium ion concentration of [2.5 x ]? A B. 3.0 C. 2.6 D. 9.0

Not the same question: #13 What is the pOH of a solution that has a hydronium ion concentration of [2.5 x ]? A B. 3.0 C. 2.6 D. 9.0

#14 What is the hydroxide ion concentration of a solution that has a pOH of 8.8? A x B x C x D x 10 -8

#15 Consider four sealed, rigid containers with the following volumes: 50 mL, 100 mL, 250 mL and 500 mL. If each of these contains.25 moles of helium gas at standard temperature, which container would have the greatest pressure? A 50 mL B 100 mL C 250 mL D 500 mL

#16 Which substance would be least likely to dissolve in a polar solvent? A nonpolar molecule B acids C polar molecule D ionic compound

#17 When referring to the solubility of different substances, the phrase "like dissolves like" is often used as a guideline to select an appropriate solvent. The property referenced in "like dissolves like" is the — A mass of the molecule B size of the molecule C polarity of the molecule D temperature of the molecule

#18 If the temperature of a gas changes, but the number of moles and volume remain constant, which of the following values must also change? A density B pressure C number of atoms D mass

#19 How many electrons are in a Cd 3+ ion? A 112 B 51 C 48 D 45

#20 From which of the following atoms would it be the MOST difficult to remove an electron? A sodium B aluminum C sulfur D chlorine

#21 A sample of Element X is found to contain 72.15% of isotope type 1 ( amu) and 27.85% of isotope type 2 ( amu). Calculate the average atomic mass. A amu B amu C amu D amu

#22 The protons in Rutherford’s experiments were used to — A identify chemical properties B identify the melting point C determine molecular mass D bombard sheets of gold

#23 Which of the following atoms would have the largest ionic radius? A lithium B sodium C potassium D cesium

#24 A solution in which more solute is dissolved than is typically soluble at a given temperature is — A unsaturated B saturated C supersaturated D diluted

#25 What volume of 2.5M NaOH solution contains 3.25 mol of NaOH? A L B L C 1.30 L D 1.45 L

#26 Element X reacts with chlorine to form an ionic compound that has the formula XCl 2. To which group on the Periodic Table could element X belong? (A) Group 1 (B) Group 13 (C) Group 2 (D) Group 15

#27 Which general trend is found in Period 3 as the elements are considered in order of increasing atomic number? (A) increasing atomic radius (B) increasing electronegativity (C) decreasing atomic mass (D) decreasing first ionization energy

#28 Which of the following stated electrons were scattered throughout a positive mass? (A) Rutherford Model (B) Planck Model (C) Bohr Model (D) Plum Pudding Model

#29 Which conclusion is based on the “gold foil experiment” and the resulting model of the atom? (A) An atom is mainly empty space, and the nucleus has a positive charge. (B) An atom is mainly empty space, and the nucleus has a negative charge. (C) An atom has hardly any empty space, and the nucleus has a positive charge. (D) An atom has hardly any empty space, and the nucleus has a negative charge.

#30 Which of the following is a false statement: (A) Ernest Rutherford identified the nucleus of the atom. (B) Democritus thought that changes in matter resulted from atoms simply rearranging. (C) John Dalton believed that all atoms of the same element were all identical. (D) According to J.J. Thomson, atoms of elements are indivisible

#31 A bromine atom in the ground state will have an electron configuration of (A) [Ar] 4s 1 3d 10 4p 5 (B) [Ar] 4s 2 3d 9 4p 5 (C) [Ar] 4s 2 3d 10 4p 5 (D) [Ar] 4s 2 3d 9 4p 6