Which of the following is a chemical property of aluminum? A. it is easily malle

Question

Which of the following is a chemical property of aluminum? A. it is easily malleable b. it melts at 660 C c. it conducts electricity d. its density is 2.71 g/cm3 e. it dissolves in certain acids In addition to mass, which property of matter must be known to calculate its volume? a. specific heat b. temperature c. molecular weight d. density e. pressure What length of a cylindrical piece of tungsten wire having a radius of 3.71 mm has a mass of 61.3 g? The density of tungsten is 19.25 g/cm3. a. 7.36 x 10^-4 m b. 5.10 x 10^2 m c. 7.36 x 10^-2 m d. 1.36 x 10^-1 m e. 1.36 x 10^-3 m Which of the following is NOT a correct name - symbol combination? a. copper, Cu b. manganese, Mn c. lithium, Li d. arsenic, Ar e. gold, Au there are three isotopes of carbon differing with respect to a. electron configuration b. nuclear charge c. neutrons d. number of protons e. atomic number which of the following elements has the largest atomic mass? a. tantalum b. cobalt c. mercury d. argon e. oxygen which of the following molecules contains the alcohol functional group: a. c6h6 b. ch3OH c. ch4 d. ch3Och3 e. c2h2 the formulas of the carbonate ion, the ammonium ion and the chlorate ion are represented, respectively, as a. co3^2-, NH2-, ClO3- b. CO3^2-, NH4+, ClO3- c. CO2-, NH3+, ClO- d. P^3-, NH3+, ClO2- e. CO3^2-, NH3+, ClO2- the complete combustion of pentane yields carbon dioxide and water. When the equation __C5H12(l) + __O2(g) ? __CO2(g) + __H2O(l) is balanced, the ratio of the coefficient of CO2 to the coefficient of Ox is a. 8:5 b. 8:6 c. 6:5 d. 5:6 e. 5:8 what is the mass in grams of one propane, c3h8 molecule? a. 7.32 x 10^-23 g B) 2.64 x 10^25 g C) 44.0 g D) 42.0 g E) 1.99 x 10^-23 g How many moles of iron atoms are contained in 4.75 g of iron? a. 266 mol b. 0.0633 mole c. 0.0848 mol d. 0.132 mol e. 0.183 mol The analysis of an organic compound showed that it contained 0.882 mol of C, 0.0420 mol of H, 0.588 mol of O, and 0.294 mol of N. How many nitrogen atoms are there in the empirical formula for this compound? a.10 b. 7 c. 2 d. 4 e. 3 The empirical formula for a group of compounds is CHCl. Lindane, a powerful insecticide, is a member of this group. The molar mass of lindane is 290.8. How many atoms of carbon does a molecule of lindane contain? a.3 b.7 c.4 d.6 e.8 A molecular compound contains 92.3% carbon and 7.7% hydrogen by mass. If 0.810 mol of the compound weighs 63.18 g, what is its molecular formula? A) C8H8 b. c6h10 c/ c4h8 d. c6h6 e. ch Analysis of a compound containing only C and Cl revealed that it contains 33.33% C atoms by number and has a molar mass of 248.75 g/mol. What is the molecular formula of this compound? a. CCl2 b. C2Cl6 c. C2Cl4 d. CCl3 e. C3Cl6 Pure copper may be produced by the reaction of copper(I) sulfide with oxygen gas as follows: Cu2S(s) + O2(g) ? 2Cu(s) + SO2(g) If 0.330 kg of copper(I) sulfide reacts with excess oxygen, what mass of copper metal may be produced? a. 0.330 kg b. 0.0659 kg c. 0.132 kg d. 0.264 kg e. 0.660 kg

Explanation / Answer

the answers are

e. it dissolves in certain acids

d. density

c. 7.36 x 10^-2 m

d. arsenic, Ar

c. neutrons

c. mercury

b. ch3OH

b. CO3^2-, NH4+, ClO3-

e. 5:8

C) 44.0 g

c. 0.0848 mol

d. 4

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