Chem 103 Tophat and Test Multiple Choice

One unit of barium hydroxide is dissolved in water and one unit of sulfuric acid is added. Which of the following describes the resulting properties? A) A precipitate will form and the solution will conduct electricity B) A precipitate will form and the solution will not conduct electricity C) No precipitate will form and the solution will conduct electricity D) No precipitate will form and the solution will not conduct electricity

B

What is the molecular formula for sodium phosphate, which is found in Pedia-Lax? A) NaPO4 B) Na3PO4 C) Na(PO4)2 D) Na(PO4)3

B

Which of the following statements is/are correct? 1) The magnitude of F increases with increasing distance between cation and ion 2) The magnitude of F increases with increasing charge of the cation and anion 3) The melting point of a salt is expected to increase with increasing magnitude of F 4) The melting point of a salt does not correlate with the magnitude of F A) 1 and 3 B) 2 and 3 C) 1, 2, and 4 D) 2 and 4

B

Which will make the light-bulb burn brighter? A) 1g NaCl in 1L water B) 2g NaCl in 1L water C) The two solutions above give identical conductivity

B

Write the atomic symbol for an element with 27 electrons and 31 neutrons A) Ga B) Co C) Ce D) Be

B

NaCl doesn't conduct electricity, will a molten salt conduct? A) No, because salts do not conduct B) Yes, because high temperatures allows electrons to flow through the salt crystals C) No, because salt crystals have no freely moving ion D) Yes, because the ions can move when in liquid form

D

Which of the following is not a molecule? A) CH4 B) NO C) CuO D) F2

C

What is the oxidation number of nitrogen in the nitrate ion? A) -5 B) -1 C) 7 D) 5 E) -7

D

A consideration aqueous solution of table salt (NaCl) is an example of A) strong electrolyte B) weak electrolyte C) nonelectrolyte

A

Will a strong acid solution such as HCl light up a light bulb? A) yes, it will conduct electricity B) no, it will not conduct electricity

A

How many moles of O atoms are present in 1 mole of calcium nitrate? A) 1 B) 3 C) 6 D) 18x10^23 E) 3.6x10^24

C

Determine the moles of Fe(s) that can be produced from the reaction of 17.5 mol Fe2O3(s) with 24.1 mol CO(g) Fe2O3(s) + 3CO(g) -> 2Fe(s) + 3CO2(g) A) 16.1 B) 35 C) 36.2 D) 41.6 E) 83.2

A

One other possible outcome for the alpha particles (2 neutrons and 2 protons) in the Rutherford experiment is that the particle might stick to the nucleus it collides with forming a new ion. If an alpha particle sticks to a 119 Au nucleus, what ion will be formed? A) 123/81 Tl 2+ B) 121/81 Tl 2+ C) 123/79 Au 2+ D) 121/79 Au 2+ E) 121/77 Ir 2+

A

What is the chemical formula of iron (II) sulfate? A) FeSO4 B) Fe2SO4 C) Fe2(SO4)3 D) Need more information

A

What is the molecular formula for magnesium carbonate? A) MgCO3 B) Mg2CO3 C) Mg(CO3)2 D) Mg3(CO3)2

A

Will a weak acid solution such as acetic acid light up a light bulb? A) yes, it will conduct electricity B) no, it won't conduct electricity

A

Will a weak base solution such as ammonia light up a light bulb? A) yes, it will conduct electricity B) no, it won't conduct electricity

A

A beaker contains 1 mole of the strong H2SO4 dissolved in water. In a titration experiment, base is slowly added to neutralize the solution. How many moles of the strong base NaOH are required to completely neutralize the H2SO4? A) 2 B) 1 C) .5 D) .25

B

Analysis of an unknown compound sampled from the smokestack of the coal-fired Charter Street Power Plant indicates 50% mass S and 50% mass O. What is the empirical formula? A) SO B) SO2 C) S2O D) SO3

B

Bubbles form in a pot of water at 100C. Is this an example of a chemical or physical change? A) chemical B) physical C) chemical and physical

B

Bubbles form in a pot of water at 100C. What are the bubbles made of? A) hot air B) gaseous water C) gaseous hydrogen and oxygen

B

Copper oxide reacts with hydrogen gas: CuO(s) + H2(g) -> Cu(s) + H2O (g) A) is an acid-base reaction; copper is the acid B) is a redox reaction, copper is reduced C) is a precipitation reaction in which copper is the precipitate D) is a combustion reaction; H is reduced

B

Examine the following two reactions and select the appropriate statement (1) Zn(s) + Mn(NO3)2(aq) -> Zn(NO3)2(aq) + Mn(s) (2) Co(s) + Pb(NO3)2(aq) -> Co(NO3)2(aq) + Pb(s) A) only 1 will occur B) only 2 will occur C) both 1 and 2 will occur D) neither will occur

B

A beaker contains 2 units of NaOH dissolved in water. In a titration, acid is slowly added to neutralize the solution. How many units of the strong acid H2SO4 are required to completely neutralize the NaOH? A) 2 B) 1.5 C) 1 D) .5

C

A new element is discovered with 117 protons in the nucleus. One would predict it would have chemical properties similar to A) alkali metals B) alkaline Earth metals C) Halogens D) noble gases

C

An unknown solid is either KBr or NaNO3. If an aqueous solution of this solid is prepared, which of the following reagents can be added to distinguish between the two compounds? A) NaCl(aq) B) Na2SO4(aq) C) Pb(NO3)2(aq) D) Li3PO4(aq) E) AgI(s)

C

Compare the melting points of NaCl, Al2O3, and CsBr. Note that Na and Cl are smaller atoms than Cs and Br. Which one is the correct order? A) NaCl < CsBr < Al2O3 B) Al2O3 < CsBr < NaCl C) CsBr < NaCl < Al2O3 D) All the same

C

Fluorine (Z=9) is a halogen. Halogens often react to form anions of charge -1. How many electrons and protons are found inside a fluoride ion? A) 9 protons and 8 electrons B) 8 protons and 9 electrons C) 9 protons and 10 electrons D) 9 protons and 11 electrons

C

Some common oxides from the second period are Li2O, BeO, B2O3, and CO2 Based on these data, what is the formula of a common oxide of Indium? A) In2O B) InO C) In2O3 D) InO2

C

The correlation between atmospheric CO2 levels and average surface temperatures allows one to conclude: A) increased surface temperatures cause the observed increases in CO2 concentration B) increased atmospheric CO2 levels cause the observed increase in temperature C) there is an interesting correlation between temperatures and CO2 levels that should be further investigated

C

What are the oxidation numbers of P and O in strontium phosphate? A) P: -3 O: -2 B) P: +3 O: -2 C) P: +5 O: -2 D) both are 0

C

What fraction of the total mass of methane (CH4) is due to hydrogen atoms? A) 4/5 B) 1/2 C) 1/4 D) 1/5

C

What is the oxidation number of chlorine in the perchlorate ion (ClO4-)? A) -5 B) -1 C) 7 D) 4 E) -7

C

When lead (II) nitrate is combined with potassium iodide, a precipitate is formed. Predict the formula of the precipitate. A) KPb B) PbI C) PbI2 D) Pb(NO3)2

C

Which ions are present in strontium phosphate? A) Sr2+, P3+, and O2- B) Sr2+, P3-, and O2- C) Sr2+ and PO43- D) both are 0

C

Which of the following is a salt? A) CH4 B) NO C) BaCl2 D) F2

C

Which of the following reactions proceeds? 1) Ni(s) + 2AgNO3 (aq) -> Ni(NO3)2 (aq) + 2Ag(s) 2) Ni(s) + 2NaNO3 (aq) -> Ni(NO3)2 (aq) +2Na(s) A) neither B) both C) only reaction 1 D) only reaction 2

C

Aluminum metal will react with bromine to yield aluminum bromide. How many moles of Br2 will react with one mole of Al metal? A) .5 B) 1 C) 1.33 D) 1.5

D

In a chemical reaction, 2.04 g V combined with 1.93 g S to form a pure compound. What is the empirical formula of the compound? A) VS B) VS2 C) V2S D) V2S3 E) V3S2

D

What is the chemical formula of iron sulfate? A) FeSo4 B) Fe2So4 C) Fe2(SO4)3 D) Need more information

D

When considering exactly 10 g of 6Li and exactly 10 g 7Li which of the following statements is true? A) There are more moles of 7Li atoms B) There will be exactly the same number of atoms of each C) There is a greater mass of 6Li atoms D) There are more atoms of 6Li compared to 7Li E) The volume of the 7Li sample is greater than the volume of 6Li

D

Which of the following compounds are salts? I) H2S II) MgO III) H2O2 IV) FeCl3 A) I and II B) III and IV C) I and III D) II and IV

D

Which of the following elements clearly has more than one large peak in its mass spectrum? A) oxygen B) fluorine C) sulfur D) chlorine

D

If the electron cloud were the size of Camp Randall stadium, then the nucleus would be the size of a A) bus B) football player C) football D) ping pong ball E) bumble bee

E

If two more shakes of Ca3(PO4)2 (s) are added to the beaker (with precipitate already formed), which of the following statements is true? A) the amount of solid in the beaker remains constant B) the amount of solid in the beaker decreases C) the number of ions in the solution increases D) the number of ions in the solution decreases E) the conductivity of the solution remains constant

E

The combustion of an unknown hydrocarbon produces .0813 H2O and .0542 mol CO2. Determine the molecular formula of this unknown compound. A) CH1.5 B) C2H3 C) C4H10 D) C2H5 E) C2H6

E