Question

29) What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? ________ C3H6O2(l) + ________ O2(g) →________ CO2(g) + ________ H2O(l) A) 5 B) 7 C) 1 D) 3 29)

30) Which of the following underlined items is not an intensive property? A) the melting point of iron metal B) the color of copper hydroxide C) the amount of gold. D) the density of argon 30)

31) Rubidium belongs to the ________ group of the periodic table. A) alkali metal B) alkaline earth metal C) halogen D) noble gas 31)

32) Chlorine belongs to the ________ group of the periodic table. A) alkali metal B) alkaline earth metal C) halogen D) noble gas 32)

33) An element has two naturally occurring isotopes. One has an abundance of 37.4% and an isotopic mass of 184.953 amu, and the other has an abundance of 62.6% and a mass of 186.956 amu. What is the atomic weight of the element? A) 185.954 amu B) 186.956 amu C) 185.702 amu D) 186.207 amu 33)

34) A piece of metal ore weighs 7.25 g. When a student places it into a graduated cylinder containing water, the liquid level rises from 21.25 mL to 25.00 mL. What is the density of the ore? A) 1.93 g/mL B) 3.21 g/mL C) 0.141 g/mL D) 0.281 g/mL 34)

4 35) How many protons (p) and neutrons (n) are in an atom of 226 88 Ra? A) 138 p, 88 n B) 88 p, 226 n C) 226 p, 88 n D) 88 p, 138 n 35)

36) 1.00 mole of O2 contains the same number of molecules as A) 0.667 mole of O3. B) 1.00 mole of CH3CO2CH2Cl. C) 2.00 mole of CH3CH2OCH2Br. D) All of these 36)

37) What is the number of moles of 5.00 × 10 22 molecules of NaBr? A) 0.083 moles B) 1.0 moles C) 1.2046 moles D) 0.037 moles 37)

) 39) Na2S is named A) sodium(II) sulfide. B) sodium disulfide. C) sodium sulfide. D) sodium sulfur. 39) 40) The factor 10-3 corresponds to which prefix? A) centi B) deci C) deka D) milli 40)

41) A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 35.0 g of calcium fluoride? A) 18.0 g B) 15.0 g C) 1.99 g D) 7.70 g

Answer 1