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StraighterLine |! Chemistry |! Exam |! 1 |!
(Chpt. |! 1-3) |! with |! answers
Which |! of |! the |! following |! is |! a |! tentative |! explanation |! for |! a |! set |! of |! observations? a. |! Law b. |! Hypothesis c. |! Theory d. |! Phenomena e. |! Prediction |! - |! Correct |! answer |! ✔b. |! Hypothesis Which |! of |! the |! following |! cannot |! be |! separated |! into |! simpler |! substances |! by |! chemical |! means? a. |! Element b. |! Emulsion c. |! Compound d. |! Homogeneous |! mixture e. |! Heterogeneous |! mixture |! - |! Correct |! answer |! ✔a. |! Element Which |! of |! the |! following |! is |! an |! extensive |! property? a. |! Density b. |! Temperature c. |! Mass
d. |! Specific |! Heat e. |! Pressure |! - |! Correct |! answer |! ✔C. |! Mass 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 |! - |! Correct |! answer |! ✔c. |! Broiling |! a |! stake |! on |! a |! grill Which |! one |! of |! these |! represents |! a |! physical |! change? a. |! Water, |! when |! heated, |! forms |! steam. b. |! Bleach |! turns |! hair |! yellow. c. |! Sugar, |! when |! heated, |! becomes |! brown. d. |! Milk |! turns |! sour. e. |! Apples, |! when |! exposed |! to |! air, |! turn |! brown. |! - |! Correct |! answer |! ✔a. |! Water, |! when |! heated, |! forms |! steam. How |! many |! significant |! figures |! does |! the |! sum |! 8.5201 |! + |! 1.93 |! contain? |! - |! Correct |! answer |! ✔ 4 The |! city |! of |! Los |! Angeles |! is |! now |! approximately |! 2400 |! miles |! south |! of |! Anchorage, |! Alaska. |! It |! is |! moving |! slowly |! northward |! as |! the |! San |! Andreas |! fault |! slides |! along. |! If |! Los |! Angeles |! is |! to |! arrive |! near |! Anchorage |! in |! 76 |! million |! years,
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II
III
IV
Which |! of |! the |! following |! are |! isotopes |! of |! the |! same |! element? Select |! one: a. |! I |! & |! II b. |! I |! & |! IV c. |! II |! & |! IV d. |! III |! & |! IV e. |! I |! & |! III |! - |! Correct |! answer |! ✔e. |! I |! & |! III Which |! of |! these |! elements |! is |! chemically |! similar |! to |! potassium? a. |! calcium b. |! arsenic c. |! phosphorus d. |! cerium e. |! cesium |! - |! Correct |! answer |! ✔e. |! cesium
The |! alkali |! metal |! elements |! are |! found |! in |! _______ |! of |! the |! periodic |! table. |! - |! Correct |! answer |! ✔group |! 1A Rutherford's |! experiment |! with |! alpha |! particle |! scattering |! by |! gold |! foil |! established |! that |! - |! Correct |! answer |! ✔protons |! are |! not |! evenly |! distributed |! throughout |! an |! atom. The |! chemical |! name |! for |! ClO3- |! is |! "chlorate |! ion". |! What |! is |! the |! common |! name |! for |! HClO3? |! - |! Correct |! answer |! ✔chloric |! acid Which |! one |! of |! the |! following |! formulas |! of |! ionic |! compounds |! is |! the |! least |! likely |! to |! be |! correct? a. |! NH4Cl b. |! Ba(OH) c. |! Na2SO d. |! Ca2NO e. |! Cu(CN)2 |! - |! Correct |! answer |! ✔d. |! Ca2NO Iron(III) |! chloride |! hexahydrate |! is |! used |! as |! a |! coagulant |! for |! sewage |! and |! industrial |! wastes. |! What |! is |! its |! formula? a. |! Fe(Cl·6H2O) b. |! Fe3Cl·6H2O c. |! FeCl3(H2O) d. |! Fe3Cl(H2O)
Balance |! the |! following |! equation:B2O3(s) |! + |! HF(l) |! → |! BF3(g) |! + |! H2O(l) a. |! B2O3(s) |! + |! 6HF(l) |! → |! 2BF3(g) |! + |! 3H2O(l) b. |! B2O3(s) |! + |! H6F6 |! (l) |! → |! B2F6(g) |! + |! H6O3(l) c. |! B2O3(s) |! + |! 2HF(l) |! → |! 2BF3(g) |! + |! H2O(l) d. |! B2O3(s) |! + |! 3HF(l) |! → |! 2BF3(g) |! + |! 3H2O(l) e. |! B2O3(s) |! + |! 6HF(l) |! → |! 2BF3(g) |! + |! 6H2O(l) |! - |! Correct |! answer |! ✔a. |! B2O3(s) |! + |! 6HF(l) |! → |! 2BF3(g) |! + |! 3H2O(l) How |! many |! moles |! of |! aspirin, |! C9H8O4, |! are |! in |! a |! tablet |! that |! contains |! 325 |! mg |! of |! aspirin? a. |! 0.00180 |! moles b. |! 0.555 |! moles c. |! 0.467 |! moles d. |! 0.357 |! moles e. |! 2.80 |! moles |! - |! Correct |! answer |! ✔a. |! 0.00180 |! moles |! (turn |! 325 |! into |! grams |! and |! divide |! by |! molecular |! weight) Which |! is |! a |! representation |! of |! a |! balanced |! chemical |! equation |! for |! the |! reaction |! of |! nitrogen |! gas |! and |! chlorine |! gas |! to |! form |! nitrogen |! trichloride? |! - |! Correct |! answer |! ✔C What |! mass |! of |! Cr |! can |! be |! produced |! by |! the |! reaction |! of |! 44.1 |! g |! of |! Cr2O3 |! with |! 35.0 |! g |! of |! Al |! according |! to |! the |! following |! chemical |! equation? 2Al |! + |! Cr2O3 |! → |! Al2O3 |! + |! 2Cr
a. |! 15.1 |! g b. |! 30.2 |! g c. |! 67.4 |! g d. |! 99.9g e. |! 104 |! g |! - |! Correct |! answer |! ✔b. |! 30. How |! many |! grams |! of |! lead(II) |! chloride |! is |! produced |! if |! 13.87 |! g |! lead(II) |! nitrate |! combines |! with |! excess |! hydrochloric |! acid |! to |! produce |! lead(II) |! chloride |! and |! nitric |! acid? a. |! 5.82 |! g b. |! 14.33 |! g c. |! 0.086 |! g d. |! 11.64 |! g e. |! 16.52 |! g |! - |! Correct |! answer |! ✔d. |! 11.64 |! g How |! many |! grams |! of |! water |! could |! be |! made |! from |! 5.0 |! mol |! H2 |! and |! 3.0 |! mol |! O2? a. |! 90. |! g b. |! 36 |! g c. |! 42 |! g d. |! 45 |! g e. |! 108 |! g |! - |! Correct |! answer |! ✔a. |! 90 |! g
