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Preguntas del test (150)
1What is correct name of the compound whose formula is BF3 ?
- Aboron trifluoride
- Bboron fluoride
- Cmonoboron trifluorine
- Dboron(III) fluoride
- Enone of these
2The law of constant composition states:
- AMatter cannot be either created or destroyed in a chemical reaction.
- BThe nucleus is a dense region of positive charge that always contains protons and neutrons.
- CAll samples of a given compound have the same proportions of their constituent elements.
- DAll atoms of a given element have a constant composition and are different than atoms of any other element.
- Enone of the above
3How many protons and electrons are present in O2-?
- A8 protons and 8 electrons.
- B10 protons and 8 electrons.
- C8 protons and 10 electrons.
- D16 protons and 8 electrons.
- Enone of the above
4The correct number of significant figures in the number 865,000 is:
- A3
- B6
- C4
- Dambiguous
- Enone of these
5Group 8A elements are also called:
- Anoble gases.
- Bhalogens.
- Calkaline earth metals.
- Dalkali metals.
- Enone of the above
6Which of the following elements has an atomic number of 4?
- AH
- BC
- CHe
- DBe
- Enone of the above
7The wavelength of blue light is 0.00000045 m. Express this wavelength in scientific notation.
- A4.5x10^-6
- B4.5x10^6
- C4.5x10^-7
- D4.5x10^7
- E0.45x10^-7
8How many cm3 are there in 2.5 m3?
- A2.5x10^6
- B2.5x10^-2
- C2.5x10^2
- D2.5x10^-6
- Enone of these
9A pure substance is:
- Acomposed of two or more different types of atoms or molecules combined in variable proportions.
- Bcomposed of only one type of atom or molecule.
- Ccomposed of two or more regions with different compositions.
- Dcomposed of two or more different types of atoms or molecules that has constant composition.
- Enone of these
10How would you classify sugar?
- Apure substance-compound
- Bmixture-heterogeneous
- Cpure substance-element
- Dmixture-homogeneous
- Enone of these
11Which of the following species is a molecular element?
- Aneon
- Bsulfur
- Cchlorine
- Dcarbon dioxide
- Enone of these
12What is the name of CoS?
- Acobalt(II) sulfide
- Bcobalt sulfide
- Ccobalt monosulfide
- Dcobaltous sulfur
- Enone of these
13How many kilojoules are there in 95.0 Calories?
- A2.27x10^7
- B3.97x10^-4
- C397
- D22.7
- Enone of these
14The correct scientific notation for the number 0.00050210 is:
- A5.0210x10^4
- B5.021x10^-4
- C5.021X10^4
- D5.0210x10^-4
- Enone of these
15All of the following statements about different elements are true EXCEPT:
- ABarium is an alkaline earth metal.
- BManganese is a transition metal.
- CSulfur is considered a metalloid.
- DKrypton is one of the noble gases.
- EIodine is a halogen.
16
The correct number of significant figures in the number 4.0x10^-2 is:- A1
- B2
- C3
- Dambiguous
- Enone of these
17Which statement reflects the results of Rutherford's gold foil experiments?
- AMost all of the alpha particles were deflected back in the direction from which they came.
- BMany alpha particles sputtered gold atoms off of the surface of the foil.
- CMany alpha particles were deflected while passing through the foil.
- DMost all of the alpha particles passed directly through the foil.
- Enone of the above
18How many low dose 81 mg aspirin tablets can be made from 1.21 kg of aspirin?
- A1500 tablets
- B15,000 tablets
- C150,000 tablets
- D1210 tablets
- E12,100 tablets
19What is the formula for an ionic compound made of barium and nitrogen?
- ABa3N2
- BBa2N3
- CBaN
- DBa2N4
- Enone of these
20How many of each type of atoms are there in the formula NH4C2H3O2?
- AN = 4, H = 7, C = 2, O = 2
- BN = 1, H = 4, C = 2, O = 2
- CN = 1, H = 3, C = 2, O = 2
- DN = 1, H = 7, C = 2, O = 2
- Enone of these
21Which of the following is not part of Dalton's Atomic Theory?
- AEach element is composed of tiny indestructible particles called atoms.
- BAll atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements.
- CAtoms combine in simple, whole-number ratios to form compounds.
- DMost of the atom's mass and all of its positive charge is contained in a small core called the nucleus.
- EAll of the above are part of the atomic theory.
22Carbon is considered which of the following?
- Aatomic element
- Bmolecular element
- Cmolecular compound
- Dionic compound
- Enone of these
23Choose the pair of names and formulas that does not match.
- Amagnesium nitrite: Mg(NO2)3
- Bcalcium carbonate: CaCO3
- Caluminum sulfate: Al2(SO4)3
- Dsodium hydrogen carbonate: NaHCO3
- Epotassium hydroxide: KOH
24What is the value of 27°C on the Kelvin temperature scale?
- A273
- B246
- C300
- D81
- Enone of these
25A 15.0 gram lead ball at 25.0°C was heated with 40.5 joules of heat. Given the specific heat of lead is 0.128 J/g·°C, what is the final temperature of the lead?
- A21.1°C
- B46.1°C
- C77.8°C
- D0.844°C
- Enone of these
26What is the correct formula for the hypochlorite polyatomic ion?
- AClO-
- BClO2-
- CClO3-
- DClO4-
- Enone of these
27In the number 48.93, which digit is estimated?
- A4
- B8
- C9
- D3
- ENone of these, all digits are certain.
28What is the oxygen-to-sulfur mass ratio of sulfur dioxide?
- A0.5
- B1.0
- C2.0
- D16
- Enone of these
29When an atom gains an electron, the resulting particle is called
- Aa proton
- Ban anion
- Ca cation
- Dan isotope
- Enone of the above
30From the following list of substances and heat capacities, choose the one that will have the lowest temperature after absorbing 100.0 kJ of heat. Assume identical masses of each substance start at the same initial temperature.
- Alead -0.128 J/g· °C
- Bcopper -0.385 J/g· °C
- Cethanol -2.42 J/g· °C
- Dwater -4.18 J/g· °C
- Enot enough information
31A lead ball has a mass of 55.0 grams and a density of 11.4 g/cm3. What is the volume of the ball?
- A0.207 mL
- B0.207 L
- C4.82 mL
- D4.82 L
- Enone of these
32How many inches are in 25.8 cm?
- A0.10
- B28.3
- C0.0984
- D10.2
- Enone of these
33The oxygen-to-hydrogen mass ratio of water is always 8.0 is an example of what fundamental law?
- ALaw of Constant Composition
- BLaw of Constant Mass Ratio
- CLaw of Conservation of Mass
- DLaw of Constant Whole Number Ratio
- Enone of these
34Group 7A elements are also called:
- Anoble gases
- Bhalogens
- Calkaline earth metals
- Dalkali metals
- Enone of these
35Which of the following is a molecular compound?
- Abarium sulfide
- Bcalcium acetate
- Cpotassium hydroxide
- Dnitrogen monoxide
- Enone of these
36How many protons and neutrons are in Cl-37?
- A20 protons, 17 neutrons
- B17 protons, 37 neutrons
- C17 protons, 20 neutrons
- D37 protons, 17 neutrons
- Enone of the above
37
If a particular process is endothermic, the reverse process must be a (an)- Achemical change.
- Bisothermal process.
- Cexothermic process.
- Dendothermic process.
- Enone of these
38Metals are located where on the periodic table?
- Aleft side
- Bright side
- Cmiddle
- Dzig-zag diagonal line
- Enone of the above
39Chlorine has two stable isotopes, Cl-35 and Cl-37. If their exact masses are 34.9689 amu and 36.9695 amu, respectively, what is the natural abundance of Cl-35? (The atomic mass of chlorine is 35.45 amu)
- A75.95%
- B24.05%
- C50.00%
- D35.00%
- E37.00%
40What is the value of 27°C on the Fahrenheit temperature scale?
- A-6.8
- B106
- C300
- D81
- Enone of these
41Which of the following statements is FALSE?
- AMatter may be a pure substance or it may be a mixture.
- BA pure substance may either be an element or a compound
- CA mixture may be either homogeneous or heterogeneous.
- DMixtures may be composed of two or more elements, two or more compounds, or a combination of both.
- EAll of these statements are true.
42What is the name of the compound made from lithium and oxygen?
- Alithium dioxide
- Blithium(I) oxide
- Coxygen lithide
- Dlithium oxide
- Enone of these
43Which of the statements about the discovery of electrons is FALSE?
- ABecause atoms are neutral, the existence of a negatively charged particle implied there must be a positively charged component of an atom.
- BThomson proposed that electrons were small particles held within a positively charged sphere.
- CRutherford proved the plum-pudding model correct.
- DThe negatively charged electron is located outside the nucleus.
- EAll of the above statements are true.
44Which of the following statements about energy is FALSE?
- AAn object possessing energy can do work on another object.
- BEnergy can neither be created nor destroyed.
- CEnergy is the single main component of the universe.
- DEnergy is the capacity to do work.
- EAll of these statements are true
45If a solid piece of shiny sodium metal is exposed to chlorine gas, a large amount of heat is released and the white solid sodium chloride (table salt) forms. Based on this information, which of the following statements is true?
- AThis process represents a physical change.
- BMass is lost during this process.
- CSodium chloride is an element.
- DThis process was exothermic.
- Enone of these
46
What is the correct formula for a potassium ion with 18 electrons?- AP+
- BK+
- CK-
- DP-
- Enone of the above
47How many grams are in 1.48x10^7 μg?
- A1.48x10^3
- B1.48x10^13
- C1.48
- D14.8
- Enone of these
48The atomic mass unit is defined as:
- Athe mass of the hydrogen atom containing only one proton.
- Bthe mass of electrons found in a carbon atom containing six protons and neutrons.
- C1/12 the mass of a carbon atom containing six protons and six neutrons.
- D1/14 the mass of a nitrogen atom containing 7 protons and 7 neutrons.
- Enone of these
49Which of the following items is a physical property?
- Athe corrosive action of acid rain on granite
- Bthe odor of spearmint gum
- Cthe combustion of gasoline
- Dthe tarnishing of a copper statue
- Enone of these
50
The correct number of significant figures in the number 0.027090 is:- A7
- B6
- C5
- Dambiguous
- Enone of these
51How many moles of Cu are in 1.48 x 1025 Cu atoms?
- A0.0408
- B24.6
- C1.54 x 10^25
- D6.022 x 10^23
- Enone of these
52
How many moles of iron are contained in 1.75 kg of iron?- A3.13 x 10^-2
- B3.13 x 10^-4
- C31.3
- D3.13 x 10^4
- Enone of these
53How many grams of water are made from the reaction of 4.0 grams of hydrogen gas?
Given the reaction: 2H2 + O2 → 2H2O- A18
- B72
- C36
- D4.5
- Enot enough information
54Which one of the following is the correct orbital diagram for nitrogen?
- A↑↓ ↑↓ ↓ ↓ ↑
- B↑↓ ↓↓ ↑ ↓ ↑
- C↑↓ ↓↓ ↑ ↑ ↑
- D↑↓ ↑↓ ↑ ↑ ↑
- Enone of these
55One mole of ammonium nitrate contains:
- A3 moles of hydrogen
- B2 moles of oxygen
- C2 moles of nitrogen
- D1 mole of nitrogen
- Enone of these
56What is the net ionic equation for the reaction of hydrochloric acid with potassium hydroxide?
- AH+ + Cl- + K+ + OH- → H2O + K+ + Cl-
- BHCl + KOH → H2O + KCl
- CH+ + OH- → H2O
- D2H+ + 2Cl- + K2+ + 2OH-→ H2O + K2+ + 2Cl-
- Enone of these
57A tricycle factory uses the following items to produce one tricycle: 3 tires, 1 frame, and 2 pedals. If the factory has available 270 tires, 90 frames, and 170 pedals, which item would limit the amount of complete tricycles that can be assembled?
- Atires
- Bframes
- Cpedals
- Dboth tires and frames are limiting
- Enot enough information
58How many moles of fluorine are in 3.2 moles of xenon hexafluoride?
- A22.4
- B12.8
- C19.2
- D16
- Enone of these
59Identify the oxidation-reduction reactions among the following:
1. Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s)
2. 2Na (s) + Cl2 (aq) → 2NaCl (s)
3. 2Mg (s) + O2 (g) → 2MgO- A1 and 2 only
- B1 and 3 only
- C2 and 3 only
- DAll of 1, 2, and 3
- ENone of 1, 2, and 3
60What is the correct order of the electromagnetic spectrum from shortest wavelength to longest?
- AGamma Rays → X-rays → Ultraviolet Radiation → Visible Light → Infrared Radiation → Microwaves → Radio Waves
- BVisible Light → Infrared Radiation → Microwaves → Radio Waves → Gamma Rays → X-rays → Ultraviolet Radiation
- CRadio Waves → X-rays → Ultraviolet Radiation → Visible Light → Infrared Radiation → Microwaves → Gamma Rays
- DGamma Rays → X-rays → Visible Light → Ultraviolet Radiation → Infrared Radiation → Microwaves → Radio Waves
- EGamma Rays → X-rays → Infrared Radiation → Visible Light → Ultraviolet Radiation → Microwaves → Radio Waves
61How many hydrogen atoms are in 35.0 grams of hydrogen gas?
- A4.25 x 10^25
- B2.09 x 10^25
- C2.12 x 10^25
- D1.04 x 10^25
- E6.022
62Which of the following compounds is INSOLUBLE?
- Apotassium acetate
- Blithium carbonate
- Cmagnesium bromide
- Daluminum sulfide
- Enone of these
63If you had an aqueous mixture that contained Ag+, K+, and Pb+2 cations, how many different solids could precipitate if a chloride solution was added?
- A1
- B2
- C3
- D4
- Eno solids will precipitate
64How many grams of chlorine gas are needed to make 117 grams of sodium chloride?
Given the reaction: 2Na + Cl2 → 2NaCl- A71.0
- B142
- C35.5
- D48.2
- Enot enough information
65What type of a reaction occurs when a potassium nitrate solution is mixed with a barium acetate solution?
- Aprecipitation
- Bacid-base neutralization
- Coxidation-reduction
- Dgas evolution
- Eno reaction
66An iron ore sample is found to be 35.00% Fe by mass. How many grams of ore is needed to obtain 454.0 grams of Fe?
- A1297
- B158.9
- C295.1
- D350.0
- Enone of these
67
In comparing 1 mole of carbon atoms to one mole of magnesium atoms, which statement is true?- AThe mass of 1 mole of carbon is greater than the mass of 1 mole of magnesium.
- BThe mass of 1 mole of magnesium is greater than the mass of 1 mole of carbon.
- CThe mass of 1 mole of carbon is the same as the mass of 1 mole of magnesium.
- DThere are more atoms in 1 mole of magnesium than in 1 mole of carbon.
- Enone of these
68What is the correct value for Avogadro's number?
- A6.022 x 10^23
- B6.022 x 10^33
- C6.022 x 10^22
- D6.022 x 10^2.3
- Enone of these
69How many electrons are unpaired in the orbitals of nitrogen?
- A14
- B5
- C9
- D3
- Enone of these
70Given that 4NH3 + 5O2 → 4NO + 6H2O, if 3.00 mol NH3 were made to react with excess of oxygen gas, the amount of H2O formed would be,
- A2.00 mol
- B3.00 mol
- C4.50 mol
- D6.00 mol
- Enone of these
71In order to determine the limiting reactant in a particular reaction, one must know each of the following EXCEPT
- Athe mass of each reactant present
- Bthe molar mass of each reactant present
- Cthe coefficient of each reactant in a balanced equation
- Dthe mass of each product formed
72Considering the following precipitation reaction:
Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq)
Which ion(s) would not be present in the net ionic equation?- APb2+, NO3-
- BK+, NO3-
- CK+, Pb2+
- DK+, I-
- EAll the above ions are in the net ionic equation.
73Which of the following statements about balancing reactions is FALSE?
- AIf there is no coefficient or subscript, a one is implied.
- BWhen coefficients are added the type of compounds is changed in the chemical reaction.
- CSubscripts are multiplied by the coefficients to determine the number of atoms in a compound.
- DCoefficients are added to compounds to ensure both sides of the reaction have equal numbers of each atom.
- EAll of these statements are true.
74What is the theoretical yield of waffles if you have 5 cups of flour, 9 eggs and 3 tbs of oil?
Given: 2 cups flour + 3 eggs + 1 tbs oil → 4 waffles- A10
- B12
- C8
- D4
- Enot enough information
75Which of the following statements is false?
- AThe limiting reactant is completely consumed in a chemical reaction.
- BThe theoretical yield is the amount of product that can be made based on the amount of limiting reagent.
- CThe actual yield is the amount of product actually produced by a chemical reaction.
- DThe percent yield = Actual Yield / Theoretical Yield x 100%
- EAll of these are true statements.
76
What is the element in which at least one electron is in the d-orbital?- AAr
- BK
- CCa
- DSc
- Enone of these
77How many electrons can exist in an orbital?
- A1
- B2
- C3
- D4
- Enone of these
78How many waffles can be made from 1 dozen eggs, assuming you have enough of all other ingredients?
Given: 2 cups of flour + 3 eggs + 1tbs oil → 4 waffles- A48
- B12
- C4
- D16
- Enot enough information
79What do the alkali metals all have in common?
- AThey all undergo similar reactions.
- BThey all have similar physical properties.
- CThey all form +1 ions.
- DThey all have the same number of valence electrons.
- Eall of these
80When the equation, ___N2 + ___H2 → ___NH3 is balanced, the coefficient of hydrogen is:
- A1
- B2
- C3
- D4
- Enone of these
81Which ingredient is the limiting reactant if you have 5 cups of flour, 9 eggs and 3 tbs of oil?
Given: 2 cups flour + 3 eggs + 1tbs oil → 4 waffles- Aflour
- Beggs
- Coil
- Dwaffles
- Enot enough information
82How many moles of chlorine gas are needed to make 0.6 moles of sodium chloride?
Given the reaction: 2Na + Cl2 → 2NaCl- A0.6
- B0.3
- C1.2
- D3.6
- Enot enough information
83What happens to an atom when it absorbs energy?
- AThe atom stores the energy for later use.
- BThe extra energy increases the speed of the electrons in their orbitals.
- CThe atom re-emits the energy as heat.
- DThe atom re-emits the energy as light.
- Enone of these
84The principal quantum number (n):
- Aspecifies the 3-D shape of the orbital.
- Bspecifies the subshell of the orbital.
- Cspecifies the maximum number of electrons.
- Dspecifies the principal shell of the orbital.
- Enone of these
85If a sample of carbon dioxide contains 3.8 moles of oxygen atoms, how many moles of carbon dioxide are in the sample?
- A1.9
- B3.8
- C7.6
- D11.4
- Enone of these
86An aqueous solution is:
- Aany liquid with another compound dissolved in it.
- Ban ionic compound with water dissolved in it.
- Cwater with a molecular compound dissolved in it.
- Dwater with another compound dissolved in it.
- Enone of these
87How many atoms are in 5.80 moles of He?
- A6.02 x 10^23
- B1.03 x 10^23
- C4.00
- D3.49 x 10^24
- Enone of these
88How many atoms are in 15.6 grams of silicon?
- A2.64 x 10^26
- B3.34 x 10^23
- C0.555
- D438
- Enone of these
89What must be supplied for most decomposition reactions to happen?
- Aenergy
- Bheat
- Celectrical current
- Dlight
- Eany of these
90How many valence electrons are in a chlorine atom?
- A1
- B17
- C10
- D7
- Enone of these
91How many grams of NO2 are theoretically produced if we start with 1.20 moles of S and 9.90 moles of HNO3?
Reaction: S + 6HNO3 → H2SO4 + 6NO2 + 2H2O- A7.20
- B331
- C455
- D786
- Enot enough information
92Which of the following statements about writing molecular, complete and net ionic equations is FALSE?
- AA molecular equation is a chemical equation showing the complete, neutral formulas for every compound in a reaction.
- BA complete ionic equation is a chemical equation showing all of the species as they are actually present in solution.
- CA net ionic equation is an equation showing only the species that actually change during the reaction.
- DA spectator ion remains unchanged in the reaction and appears on both sides of the equation.
- EAll of the statements are true.
93
In writing the chemical equation for a precipitation reaction, what abbreviation of the physical state must appear with one of the products?- A(s)
- B(g)
- C(l)
- D(w)
- Enone of these
94What type of reaction is the generic equation AB + CD → AD + CB?
- Asynthesis/combination
- Bdecomposition
- Csingle displacement
- Ddouble-displacement
- Enone of these
95What type of a reaction occurs when a sodium hydroxide solution is mixed with an acetic acid solution?
- Aprecipitation
- Bacid-base neutralization
- Coxidation-reduction
- Dgas evolution
- Eno reaction
96What is the mass in grams of 5.40 moles of lithium?
- A6.94
- B37.5
- C1.29
- D3.25 x 1024
- Enone of these
97How many molecules of sulfur trioxide are in 78.0 grams?
- A5.87 x 10^23
- B7.33 x 10^23
- C3.76 x 10^27
- D0.974
- Enone of these
98Which subshell letter corresponds to a spherical orbital?
- As
- Bp
- Cd
- Df
- Enot enough information
99
What is the limiting reactant for the following reaction given we have 3.4 moles of Ca(NO3)2 and 2.4 moles of Li3PO4?
Reaction: 3Ca(NO3)2 + 2Li3PO4 → 6LiNO3 + Ca3(PO4)2- ACa(NO3)2
- BLi3PO4
- CLi NO3
- DCa3(PO4)2
- Enot enough information
100What is the gas produced when hydrochloric acid is reacted with ammonium carbonate?
- Aammonia
- Bchlorine
- Chydrogen
- Dcarbon dioxide
- Enone of these
101A sample of helium gas initially at 37.0 °C, 785 torr and 2.00 L was heated to 58.0 °C while the volume expanded to 3.24 L. What is the final pressure in atm?
- A1.79
- B517
- C0.681
- Dnone of these
- E3.21
102How many liters of O2 (g) are needed to react completely with 56.0 L of CH4 (g) at STP to produce CO2 (g) and H2O (g)?
Given: CH4 (g) + 2O2 (g) → CO2 (g) + H2O (g)- A56.0 L
- Bnone of these
- C84.0 L
- D28.0 L
- E112. L
103The opposite process of freezing is:
- Asublimation
- Bcondensation
- Cevaporation
- Dboiling
- Enone of these
104Which Lewis structure below correctly represents KCl?
- AK CL 8 electron dots no brackets
- BK+ CL 4 electron dots brackets -
- Cnone of these
- DK 8 electron dots no brackets CL 8 electron dots no brackets
- EK+ CL 8 electron dots brackets -
105A balloon originally had a volume of 0.439 L at 44 °C and a pressure of 729 torr. To what temperature must the balloon be cooled to reduce its volume to 378 mL if the pressure remained constant?
- A273 °C
- BNone of these
- C0 °C
- D38 °C
- E95 °C
106Increasing the intermolecular forces of a liquid will do which of the following?
- Aall of these
- Bdecrease the evaporation rate
- Cincrease the viscosity
- Ddecrease the vapor pressure
- Eincrease the surface tension
107When you make ice cubes:
- Anone of these
- Bit is an endothermic process.
- Cit is an exothermic process.
- Dthe process is referred to scientifically as sublimation.
- Ethe heat of vaporization must be removed.
108
If the volume of a gas container at 32.0 °C changes from 1.55 L to 755 mL, what will the final temperature be?- A353 °C
- Bnone of these
- C149 °C
- D273 °C
- E-124 °C
109Which molecule listed below has a nonpolar covalent bond?
- AH2
- Bnone of the compounds
- Call of the compounds
- DNaCl
- EH2O
110What problem could happen if deep sea divers used pure oxygen in their tanks?
- Ahypoxia
- Boxygen toxicity
- Cnitrogen narcosis
- Dnone of these
- Erapture of oxygen
111Which Lewis structure below correctly represents the compound formed between magnesium and sulfur?
- AMg+ [S(8 dots)] -
- BMg+ [S(8 dots)] -2 Mg+
- C[S(8 dots0]- Mg+2 [S(8 dots)] -
- DMg+2 [S(8 dots)] -2
- Enone of these
1121 atm is equal to:
- Aall of these
- B101,325 Pa.
- C760 torr.
- D760 mm Hg.
- E14.7 psi.
113Which set shows the correct resonance structures for SeO2?
- ASeO2 does not have a resonance structure.
- BO=Se-O <> O-Se=O (no underlined Se's)
- CO-Se-O <> O=Se=O
- DO=Se-O <> O-Se=O (Underlined Se's)
- EO=Se=O <> O triplebond Se-O <> O-Se triplebond O
114What is the angle between electron groups in the trigonal planar electron geometry?
- A180 °
- B109.5 °
- C90 °
- Dnot enough information
- E120 °
115Which of the following statements about pressure is FALSE?
- AThe atmosphere has a pressure as the components of air collide with surfaces.
- BA deep well dug in the ground must have the pump located at the bottom of well in order to have the water come to the surface.
- CBy creating a pressure difference, the atmospheric pressure can push liquid up a straw.
- DAll of these statements are true.
- EPressure is caused by gas molecules colliding with surfaces.
116Which molecule below has hydrogen bonding?
- ACH4
- BHCl
- CCH3CH2OH
- Dall of these
- EH2SO4
117A mothball can change directly from its solid phase to its gaseous phase. This process is known as:
- Asublimation
- Bdeposition
- Cnone of these
- Dcondensation
- Emelting
118
Lewis theory predicts that the formula for a compound between barium and sulfur is:- ABaS2
- BBaS3
- Cnone of these
- DBa2S
- EBaS
119Which state of matter has a low density and is not easily compressed?
- Aliquids
- Bgases
- Cnone of these
- Dsolids
- Eboth solids and liquids
120What is the initial temperature of a gas if the volume changed from 1.00 L to 1.10 L and the final temperature was determined to be 255.0
°C?- A207 °C
- B232 °C
- Cnone of these
- D-41 °C
- E480 °C
121How many moles of NaF are in 34.2 grams of a 45.5% by mass NaF solution?
- A0.814
- B0.371
- C15.6
- D75.2
- Enone of these
122What is the equivalent pressure of 0.905 atm in units of mm Hg?
- A840
- Bnone of these
- C0.905
- D688
- E13.3
123Divers often inflate heavy duty balloons attached to salvage items on the sea floor. If a balloon is filled to a volume of 3.00L at a pressure of 2.50 atm, what is the volume of the balloon when it reaches the surface?
- A5.50 L
- B7.50 L
- C1.20 L
- Dnone of these
- E0.833 L
1241 torr is equal to:
- AAll of these.
- B1 Pa.
- C760 mm Hg.
- D1 mm Hg.
- E14.7 psi.
125What are the ion concentrations in a 0.12 M solution of AlCl3?
- A0.36 M Al3+ ions and 0.12 M Cl- ions
- B0.12 M Al3+ ions and 0.36 M Cl- ions
- Cnone of these
- D0.040 M Al3+ ions and 0.040 M Cl- ions
- E0.12 M Al3+ ions and 0.040 M Cl- ions
126Which of the following compounds is a strong electrolyte?
- ANaC2H3O2
- BNaCl
- CNH4Cl
- DHCl
- Eall of these
127What is the mass percent of a solution prepared by dissolving 18.9 grams of solid into 39.5 grams of water?
- Anone of these
- BThe identity of the compound must be known.
- C58.4%
- D32.4%
- E47.8%
128A situation where two opposite processes are occurring at equal rates, and no net change is taking place, is called:
- Avaporization
- Bdynamic equilibrium
- Ccondensation
- Devaporation
- Enone of these
129Which intermolecular force is common to all polar molecules but not nonpolar molecules?
- AX-forces
- Bdipole-dipole forces
- Cnone of these
- Ddispersion forces
- Ehydrogen bonding
130What is the molecular geometry of ozone, O3?
- Abent
- Bnot enough information
- Ctrigonal pyramidal
- Dlinear
- Etetrahedral
131The tragedy at Lake Nyos in Cameroon, West Africa, was caused by:
- Anone of these
- Bthe release of excessive amounts of carbon dioxide that had been dissolved in the water at the bottom of the lake.
- Cthe release of excessive amounts of oxygen gas that had been dissolved in the water at the bottom of the lake.
- Dthe release of excessive amounts of nitrogen gas that had been dissolved in the water at the bottom of the lake.
- Ethe release of excess water stored in the volcanic lake which flooded the village below.
132What happens to the volume of a gas when you double the number of moles of gas while keeping the temperature and pressure constant?
- Anone of these
- BThe volume decreases, but more information is needed.
- CThe volume increases, but more information is needed.
- DThe volume is halved.
- EThe volume doubles.
133A solution is saturated in both nitrogen gas (N2) and sodium iodide (NaI) at 50 °C. When the solution is cooled to 25 °C, which of the following is most likely to occur?
- Anot enough information
- BNothing will happen.
- CSome nitrogen gas bubbles out of solution
- DBoth some nitrogen gas bubbles out of solution and some sodium iodide will precipitate out of solution will happen.
- ESome sodium iodide will precipitate out of solution.
134What is the third most abundant component of dry air?
- Aoxygen
- Bnitrogen
- Csmog
- Dargon
- Ecarbon dioxide
135What is the correct Lewis structure for water?
- AH- O (underlined and overlined) - H
- BH- O (8 electrons) - H
- CH (6 electrons) - O (underlined and overlined) - H (6 electrons)
- DH=O (underlined and overlined) = H
- Enone of these
136What molarity should the stock solution be if you want to dilute 25.0 mL to 2.00 L and have the final concentration be 0.103 M?
- A0.243 M
- B4.12 M
- C8.24 M
- D0.206 M
- Enone of these
137Which intermolecular force is the strongest?
- Anone of these
- Bdispersion forces
- Cdipole-dipole forces
- DX-forces
- Ehydrogen bonding
138What is the volume of 21.0 g of nitrogen gas at STP?
- A16.8 L
- BNone of these
- C33.6 L
- D11.2 L
- E22.4 L
139The Lewis structure [6 dots O - 2 dots N = 6 dots O], represents
- ANO2-
- BNO2+-
- Cnone of these
- Dboth NO2+ and NO2-
- ENO2
140A 3.76 g sample of a noble gas is stored in a 2.00 L vessel at 874 torr and 25
°C. What is the noble gas?- AAr
- Bnot enough information
- CKr
- DHe
- ENe
141The central atom in the chlorate anion, ClO3- is surrounded by
- Atwo bonding and two unshared pairs of electrons.
- Bnone of these.
- Cone bonding and three unshared pairs of electrons.
- Dtwo double bonds and no unshared pairs of electrons.
- Ethree bonding and one unshared pair of electrons.
142The oxygen in the air we breathe is classified as:
- Athe solute in a heterogeneous gas-liquid mixture.
- Bnone of these
- Cthe solvent in a simple mixture.
- Dthe solute in a homogeneous gas mixture.
- Ethe solvent in a homogeneous gas mixture.
143Suppose a balloon was released from the ground and rose to such a height that both the atmospheric pressure and atmospheric temperature decreased. Which statement is true?
- AThe temperature change acts to increase the balloon's volume.
- BThe pressure change acts to decrease the balloon's volume.
- Cnone of these
- DBoth the temperature and pressure changes act to decrease the balloon's volume.
- EBoth the temperature and pressure changes act to increase the balloon's volume.
144What is the correct Lewis structure for N2?
- A6 dots N - 6 dots N
- Bnone of these
- C4 dots N = 4 dots N
- DN-N
- E2 dots N triple bond 2 dots N
145To solve problems using Boyle's Law, which mathematical equation should be used?
- Ap1/v1 = p2/v2
- Bp1v1=p2v2
- Cp1/v2=p2/v1
- Dp2v1=p1v2
- Enone of these
146The vapor pressure of water at 20.0 °C is 17.5 mm Hg. If the pressure of a gas collected over water was measured to be 453.0 mm Hg. What is the pressure of the pure gas?
- A0.573 atm
- B0.619 atm
- C0.596 atm
- Dnone of these
- E0.0230 atm
147What is the molality of a solution made by dissolving 14.7g of C6H12O6
into 150.0 mL of water? Assume the density of water is 1.00 g/ml.- A0.544
- Bnone of these
- C10.2
- D0.0816
- E0.980
148Ammonia gas decomposes according to the equation: 2NH3(g) → N2(g) + 3H2(g) If 15.0 L of nitrogen is formed at STP, how many liters of hydrogen will be produced (also measured at STP)?
- A15.0 L
- B30.0 L
- C45.0 L
- D90.0 L
- Enot enough information
149When sufficient quantity of heat has been added to reach the boiling point of a solution, what happens to any additional heat added?
- AAdditional heat alters the viscosity and the surface tension of the liquid which raises the vapor pressure and increases the boiling point which is why you must continually heat the solution.
- BAdditional heat raises the temperature of the liquid which in turn increases the rate at which boiling occurs.
- CNone of these are correct statements.
- DAdditional heat lowers the intermolecular forces of the liquid which in turn increases the volatility of the liquid.
- EAdditional heat is used to maintain the boiling of the liquid as the process is endothermic and requires continued input of energy.
150How many grams of KCl are needed to make 50.0 mL of 2.45 KCl?
- A1.52
- Bnone of these
- C9.13
- D91.3
- E0.123
Información
- Descripción
- Test sobre Sin título, creado por ryman1991 el 02/05/2016.
- Autor
- ryman1991
- Idioma
- English
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