Chemistry multiple choice

Which of these pairs of elements would be most likely to form an ionic compound? A) P and Br B) Cu and K C) C and O D) O and Zn E) Al and Rb

D

Which of these quantities represents the largest mass? A) 2.0 × 102 mg B) 0.0010 kg C) 1.0 × 105 g D) 2.0 × 102 cg E) 10.0 dg

D

Which one of the following formulas of ionic compounds is the least likely to be correct? A) NH4Cl B) Ba(OH)2 C) Na2SO4 D) Ca2NO3 E) Cu(CN)2

D

An oxide ion, O2-, has A) 8 protons and 10 electrons. B) 10 protons and 8 electrons. C) 8 protons and 9 electrons. D) 8 protons and 7 electrons. E) 10 protons and 7 electrons.

A

Diiodine pentaoxide is used as an oxidizing agent that converts carbon monoxide to carbon dioxide. What is its chemical formula? A) I2O5 B) IO5 C) 2IO5 D) I5O2 E) (IO5)2

A

How many cubic inches are in 1.00 liter? (1 in = 2.54 cm) A) 61.0 in3 B) 155 in3 C) 394 in3 D) 1.64 × 104 in3 E) none of the above

A

The result of (3.8621 × 1.5630) - 5.98 is properly written as A) 0.06 B) 0.056 C) 0.0565 D) 0.05646 E) 0.056462

A

Which of the following cannot be separated into a simpler substance by chemical means? element emulsion compound homogeneous mixture heterogeneous mixture

A

Which of the following is not an S.I. base unit? A) meter B) ampere C) second D) gram E) Kelvin

D

9. How many milliliters is 0.0055 L? A) 0.55 mL B) 5.5 mL C) 0.5 mL D) 0.0000055 mL E) 182 mL

B

An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? A) 15 protons, 16 neutrons, 15 electrons B) 16 protons, 15 neutrons, 16 electrons C) 16 protons, 31 neutrons, 16 electrons D) 32 protons, 31 neutrons, 32 electrons E) 16 protons, 16 neutrons, 15 electrons

B

How many neutrons are there in an atom of lead whose mass number is 208? A) 82 B) 126 C) 208 D) 290 E) none of the above

B

Iron has a density of 7.87 g/cm3. What mass of iron would be required to cover a football playing surface of 120 yd × 60 yd to a depth of 1.0 mm? (1 in = 2.54 cm) A) 76 kg B) 47 Mg C) 7.6 × 105 g D) 4.7 × 108 g E) 1.9 × 107 g

B

Isopropyl alcohol, commonly known as rubbing alcohol, boils at 82.4°C. What is the boiling point in Kelvin? A) 387.6 K B) 355.6 K C) 323.6 K D) 190.8 K E) -190.8 K

B

Tetrasulfur dinitride decomposes explosively when heated. What is its formula? A) S2N4 B) S4N2 C) 4SN2 D) S4N E) S2N

B

The S.I. prefixes milli- and mega- represent, respectively: A) 106 and 10-6. B) 10-3 and 106. C) 103 and 10-6. D) 10-3 and 109. E) 10-6 and 10-3.

B

The speed needed to escape the pull of Earth's gravity is 11.3 km/s. What is this speed in mi/h? (1 mi = 1609 m) A) 65,500 mi/h B) 25,300 mi/h C) 18,200 mi/h D) 1090 mi/h E) 5.02 × 10-3 mi/h

B

What is the formula for the ionic compound formed by calcium ions and nitrate ions? A) Ca3N2 B) Ca(NO3)2 C) Ca2NO3 D) Ca2NO2 E) CaNO3

B

What term is a tentative explanation for observations that are made that result in the formulation of this concept? A) law B) hypothesis C) theory D) phenomena E) prediction

B

Which is the correct formula for copper (II) phosphate? A) Cu2PO4 B) Cu3(PO4)2 C) Cu2PO3 D) Cu(PO4)2 E) Cu(PO3)2

B

Which of the following is a nonmetal? A) lithium, Li, Z = 3 B) bromine, Br, Z = 35 C) mercury, Hg, Z = 80 D) bismuth, Bi, Z = 83 E) sodium, Na, Z = 11

B

Which of these elements is chemically similar to magnesium? A) sulfur B) calcium C) iron D) nickel E) potassium

B

A magnesium ion, Mg2+, has A) 12 protons and 13 electrons. B) 24 protons and 26 electrons. C) 12 protons and 10 electrons. D) 24 protons and 22 electrons. E) 12 protons and 14 electrons.

C

After an atom has gained an electron it becomes a/an ______ and has a _______ charge. A) anion, positive B) isotope, negative C) anion, negative D) cation, positive E) nucleus, positive

C

After carrying out the operations below, how many significant figures are appropriate to show in the result? (13.7 + 0.027) ÷ 8.221 A) 1 B) 2 C) 3 D) 4 E) 5

C

If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? A) solute B) compound C) homogeneous mixture D) heterogeneous mixture E) solvent

C

The average distance between the Earth and the moon is 240,000 miles. Express this distance in kilometers. (1 mi = 1609 m) A) 6.1 × 105 km B) 5.3 × 105 km C) 3.9 × l05 km D) 1.5 × 105 km E) 9.4 × 104 km

C

The mass of a sample is 550 milligrams. Which of the following expresses that mass in kilograms? A) 5.5 × 108 kg B) 5.5 × 105 kg C) 5.5 × 10-4 kg D) 5.5 × 10-6 kg E) 5.5 × 10-1 kg

C

The number 1.050 × 109 has how many significant figures? A) 2 B) 3 C) 4 D) 9 E) 13

C

What is the volume of a container that contains 14.3 g of a substance having a density of 0.988 g/cm3? A) 14.1 cm3 B) 0.0691 cm3 C) 14.5 cm3 D) 141 cm3 E) 691 cm3

C

Which of the following is a chemical change? A) boiling water B) melting wax C) broiling a steak on a grill D) condensing water vapor into rainfall E) carving a piece of wood

C

Which of the following is a metalloid? A) carbon, C, Z = 6 B) sulfur, S, Z = 16 C) germanium, Ge, Z = 32 D) iridium, Ir, Z = 77 E) bromine, Br, Z = 35

C

Which of the following is the empirical formula for hexane, C6H14? A) C12H28 B) C6H14 C) C3H7 D) CH2.3 E) C0.43H

C

10. Silicon, which makes up approximately 25% of the Earth's crust by mass, is used widely in the modern electronics industry. It has three naturally occurring isotopes, 28Si, 29Si, and 30Si. Calculate the atomic mass of silicon. Isotope Isotopic Mass (amu) Abundance % 28Si 27.976927 92.23 29Si 28.976495 4.67 30Si 29.973770 3.10 A) 29.2252 amu B) 28.9757 amu C) 28.7260 amu D) 28.0855 amu E) 27.9801 amu

D

How many mm3 are in 16.7cm3? A) 1.67 × 10-5 mm3 B) 1.67 × 10-8 mm3 C) 1.67 × 107 mm3 D) 1.67 × 104 mm3 E) 1.67 × 10-4 mm3

D

If normal body temperature is 98.6 °F then what is this in Celsius? A) 34°C B) 35.5°C C) 36.4°C D) 37°C E) 38.7°C

D

Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants. It has two naturally occurring isotopes, 6Li (isotopic mass = 6.015121 amu) and 7Li (isotopic mass = 7.016003 amu). Lithium has an atomic mass of 6.9409 amu. What is the percent abundance of lithium-6? A) 92.50% B) 86.66% C) 46.16% D) 7.503% E) 6.080%

D

Radio waves travel at the speed of light which is 3.00 × 108 m/s. How many minutes does it take for a radio message to reach Earth from Saturn if Saturn is 7.9 × 108 km from Earth? A) 4.4 × 10-2 min B) 1.6 × 105 min C) 4.0 × 1015 min D) 44 min E) 2.6 min

D

The chemical formula for iron (II) nitrate is A) Fe2(NO3)3. B) Ir(NO2)2. C) Fe2N3. D) Fe(NO3)2. E) Fe(NO2)2.

D

The elements in a column of the periodic table are known as A) metalloids. B) a period. C) noble gases. D) a group. E) nonmetals.

D

Which of the following does not have a uniform composition throughout? A) element B) compound C) homogeneous mixture D) heterogeneous mixture E) solvent

D

Which of the following is a molecular formula for CH? A) C2H6 B) C3H9 C) C4H10 D) C6H6 E) None of the answers are correct.

D

A dose of medication was prescribed to be 35 microliters. Which of the following expresses that volume in centiliters? A) 3.5 × 105 cL B) 3.5 × 104 cL C) 3.5 cL D) 3.5 × 10-4 cL E) 3.5 × 10-3 cL

E

Atoms X, Y, Z, and R have the following nuclear compositions: Which two are isotopes? A) X & Y B) X & R C) Y & R D) Z & R E) X & Z

E

How many micrograms are in 65.3 kg? A) 0.653 g B) 6.53 × 107 g C) 6.53 × 104 g D) 6.53 × 10-8 g E) 6.53 × 1010 g

E

If you have a graduated cylinder containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of 7.95 g is dropped into the cylinder, what is the density of this metal? A) 0.0835 g/mL B) 0.513 g/mL C) 0.0718 g/mL D) 10.0 g/mL E) 9.97 × 10-2 g/mL

E

Select the answer that expresses the result of this calculation with the correct number of significant figures. A) 13.3568 B) 13.357 C) 13.36 D) 13.4 E) 13

E

The chemical name for ClO3- is "chlorate ion." What is the common name for HClO3? A) hydrochloric acid B) chloroform C) hydrogen trioxychloride D) chlorous acid E) chloric acid

E

The diameter of Earth is 12.7 Mm. Express this diameter in centimeters. A) 1.27 × 105 cm B) 1.27 × 106 cm C) 1.27 × 107 cm D) 1.27 × 108 cm E) 1.27 × 109 cm

E

What is the name of Mn(CO3)2? A) manganese carbide B) magnesium (IV) carbonate C) manganese (II) carbonate D) magnesium (II) carbonate E) manganese (IV) carbonate

E

What is the name of P4Se3? A) phosphorus selenide B) phosphorus triselenide C) tetraphosphorus selenide D) phosphoric selenide E) tetraphosphorus triselenide

E

Which of these is an example of a physical property? A) corrosiveness of sulfuric acid B) toxicity of cyanide C) flammability of gasoline D) neutralization of stomach acid with an antacid E) lead becomes a liquid when heated to 601°C

E