Quiz
Chemistry 151 Final
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Perguntas do quiz (55)
1A 9.0 g sample of solid sodium bicarbonate completely decomposes into solid sodium hydroxide and carbon dioxide gas when heated. After the sodium hydroxide cools it has a mass of 4.74 g. According to the Law of Conservation of Mass, what mass of carbon dioxide must have been formed?
- Aa) 4.67 g
- Bb) 4.26 g
- Cc) 4.3 g
- Dd) 13.7 g
- Ee) none of the above
2A substance that can only be separated by chemical means is:
- Aan element
- Ba compound
- Ceither a compound or an element
- Da homogenous mixture
- Ea heterogeneous mixture
3Which of the following statement(s) is(are) not correct?
- Aa) The conversion of compounds into elements is a chemical change.
- Bb) The conversion of sugar into carbon and water is a chemical change.
- Cc) The conversion of liquid water into gaseous water is a chemical change.
- Dd) The conversion of elements into compounds is a chemical change.
- Ee) The evaporation of water is a physical change.
- Ff) d and e
4Which of the following is a mixture?
- Aa) sucrose (C12H22O11)
- Bb) solder (an alloy made of varying amounts of Sn and Pb)
- Cc) the diatomic gas bromine (Br2)
- Dd) both a and b
- Ee) both b and c
5If the distance between layers of silicon atoms in graphite is given as 823 pm, what is the distance in cm?
- A8.23 x 10^-10
- B8.23 x 10^-12
- C8.23 x 10^-7
- D8.23 x 10^-8
- E8.23 x 10^-6
6A 0.75 kg sample of methylene chloride has a density of 1.32 x 10^3 mg/cm^3. What is the volume in L of methylene chloride?
- A0.99 L
- B5.7 L
- C5.68 x 10^-1 L
- D5.7 x 10^-1
- E0.5682 L
7The British physicist who won the Nobel Peace prize in 1906 for the discovery of the electron was:
- AErnest Rutherford
- BJJ Thomson
- CRobert Millikan
- DJames Chadwick
8Which statement is not true of the nucleus of an atom?
- Aa) it contains the neutrons, protons and electrons
- Bb) it is at the center of an atom
- Cc) its overall charge is positive
- Dd) it contains most of the mass of an atom
- Ee) both a and d
9The number of protons in a neutral atom of a given element is equal to:
- Aa) the mass number
- Bb) the nuclear number
- Cc) the atomic number
- Dd) the number of electrons
- Ee) both b and c
- Ff) both c and d
10How many protons, neutrons and electrons are in the isotope of Ni+2 having a mass number of 57?
- A28p, 29n, 30e-
- B57p, 29n, 28e-
- C28p, 29n, 26e-
- D28p, 57n, 26e-
11The formulas of the phosphate ion, the ammonium ion and the perchlorate ion are represented by:
- APO4-3, NH4+, ClO3-
- BPO3-2, NH3+, ClO2-
- CPO4-3, NH4+, ClO4-
- DPO4-2, NH4+, ClO4-
12The formula for potassium sulfide is:
- AKS
- BKS2
- CK2SO4
- DK2S
13How many atoms of Ca are there in 2.11 g of Ca?
- A3.11 x 10^+22
- B8.75 x 10^-26
- C1.27 x 10^+24
- D3.11 x 10^+23
14Which of the following statements is true for acetic acid, C2H4O2?
- A2 mole C2H4O2 contains 2 moles C
- B3 mole C2H4O2 contains 8 moles H
- C5 mole C2H4O2 contains 10 moles O
- D1 mole C2H4O2 contains 1 moles C
15How many grams of oxygen are there in 25 g of Al2O3?
- A1.17 x 10^1 g
- B12 g
- C3.9 g
- D1.2 x 10^25 g
16What is the mass percentage of Cl in 1 mole C14H9Cl5?
- A50.02%
- B47.42%
- C10.01%
- D75.09%
17What is the percent yield of Cu in an experiment if the actual yield is 12.01 g and the theoretical yield is 14.15 g?
- A117.8%
- B84.87%
- C2.14%
- D71.09%
18A soluble molecular compound has the ability to conduct electricity.
- AVerdadeiro
- BFalso
19Which of the following is(are) example(s) of a weak electrolyte?
- Aa) HCl
- Bb) NH3
- Cc) KOH
- Dd) HCN
- Ee) b and c
- Ff) b and d
20When AgNO3 reacts with HCl the products are:
- Aa) H2 (g)
- Bb) nitric acid
- Cc) AgCl (s)
- Dd) AgCl (aq)
- Ee) b and c
- Ff) b and d
21What is the net ionic equation when HC2H3O2 reacts with NaOH?
- AHC2H3O2(aq) + NaOH(aq) -> C2H3O2Na(aq) + H2O(l)
- BH+(aq) + OH-(aq) -> H2O(l)
- CHC2H3O2(aq) + 2OH-(aq) -> C2H3O2-(aq) + 2 H2O(l)
- DHC2H3O2(aq) + OH-(aq) -> C2H3O2-(aq) + H2O(l)
22A Bronsted-Lowry acid/base reaction is best defined as:
- Aa combination reaction
- Ba redox reaction
- Ca loss of a proton
- Da proton transfer reaction
23A diprotic acid has ___ acidic protons.
- Amany
- B2
- C3
- D4
- Ed
24The gas formed when Na2S reacts with H2SO4 is:
- ASO3
- BSO2
- CH2S
- DCl2
25What are the oxidation sates of each element in KClO2?
- AK=+1, Cl=+5, O=-2
- BK=-1, Cl=+5, O=-2
- CK=+1, Cl=-5, O=-2
- DK=+1, Cl=+5, O=+2
26CuCl2(aq) + Mg(s) -> MgCl2(aq) + Cu(s) is an example of a:
- Aa) combination reaction
- Bb) combustion reaction
- Cc) displacement reaction
- Dd) redox reaction
- Ee) b and d
- Ff) c and d
27The kinetic energy of a 151 lb person with a velocity of 2.0 m/s is: (given 1lb=0.4536kg)
- Aa) 1.4 x 10^2 J
- Bb) 1.4 x 10^-2 kgm^2/s^2
- Cc) 1.4 x 10^-2 J
- Dd) 1.4 x 10^2 kgm^2/s^2
- Ee) a and d
- Ff) b and c
28Calculate the quantity of heat required (q) to raise the temperature of a 0.103 g sample of Cu by 10.0°C given a specific heat of 0.384 J/g°C.
- A0.0396 J
- B03.84 J
- C0.3955 J
- D0.396 x 10^3 kJ
- E0.396 J
29Internal energy, U is best defined as:
- Athe sum of the kinetic and potential energies of all particles making up a substance
- Bthe total sum of all energies contained within a system
- Cpositional energy
- Dthe energy contained within the nucleus of an atom
30What is true of the relationship between the energy, the frequency and the wavelength of light:
- Aas energy increases, frequency decreases and wavelength decreases
- Bas energy decreases, frequency decreases and wavelength decreases
- Cas energy increases, frequency increases and wavelength decreases
31When an electron transitions from the n=1 to the n=4 energy level light is emitted.
- AVerdadeiro
- BFalso
32Which transition below best describes the absorption of the longest possible wavelength of light?
- An=1 to n=6
- Bn=2 to n=1
- Cn=7 to n=8
- Dn=8 to n=7
33The value of the principal quantum number is referring to:
- Athe shape of an atom
- Bthe energy level of an electron
- Cthe number of electrons in an atom
- Dthe size of the electron
34An electron having n=3 and a l=2 must be in the:
- A3p subshell
- B3d subshell
- C3s subshell
- D3f subshell
35A 2p subshell contains how many orbitals?
- A1
- B2
- C3
- D5
36When l=4, n must have a minimum value of :
- A4
- B5
- C6
- D1
37According to the energy order building up principle which statement(s) below is never correct.
- Aa) 3p fills after 3s
- Bb) 4s fills before 3d
- Cc) 2s fills after 1s
- Dd) 5s fills before 4p
- Ee) a and d
- Ff) b and d
38Choose the correct statement below in terms of atomic size.
- ATe<Ag<Ru<Rb<Cs
- BRu<Ag<Te<Rb<Cs
- CCs<Ag<Te<Rb<Cs
- DCs<Rb<Ru<Ag<Te
39Ionization energy refers to the amount of energy required to add an electron to the valence shell of a gasoline atom.
- AVerdadeiro
- BFalso
40Which species would you expect to have the greatest ionization energy associated with it?
- AAl+2
- BAl+1
- CAl
- DAl+3
41How many electrons are shared when the ionic compound MgS2 is formed?
- A0
- B2
- C3
- D1
42Which of the following is correct in terms of ionic radii:
- ATe-2<At-1<Cl-<S-2<P-3
- BS-2<Cl-<At-1<P-3<Te-2
- CCl-<S-2<P-3<Te-2<At-1
- DP-3<Te-2<At-1<Cl-<S-2
43Which of the following would you expect to have the highest melting point?
- ABaS
- BLiCl
- CAl2O3
- DMgCl2
44Which noble gas is Ca+2 isoelectronic with?
- ANe
- BAr
- CKr
- DXe
45Which is the most electronegative atom?
- ACl
- BH
- CO
- DF
46Which atoms are most likely to form triple bonds?
- AC, N, O and Cl
- BC and P
- CC and O
- DC, N and S
47Which bond is most polar?
- AHCl
- BHBr
- CHO
- DHI
48How many resonance Lewis electron dot structures does O3 have?
- A1
- B2
- C3
- D4
49Which bond would require the most energy to break?
- AH-C
- BC=C
- CC≡C
- DC-C
50The molecule CO2 is a polar molecule.
- AVerdadeiro
- BFalso
51Which of the following describes the bond angles if a central atom has 5 groups around it?
- A90° and 180°
- B90°, 120° and 180°
- C120°
- D90°
52What is the name of the molecular geometry about the central atom in PCl3?
- Atrigonal pyramidal
- Btetrahedral
- Cbent
- Ddistorted tetrahedron
53Which of the following is a nonpolar molecule?
- AKrF2
- BAsF3
- CSF2
- DCH3F
54What is the hybridization about the Xe atom in XeF4?
- Asp3
- Bsp
- Csp3d
- Dsp3d2
55Which statement below is most accurate with regard to the total number of σ and π bonds in HCOCH3?
- A5 σ and 2 π bonds
- B7 σ bonds
- C6 σ and 1 π bonds
- D1 π bond
Informações
- Descrição
- A quiz made up of multiple choice questions from my exams.
- Autor
- mmchamp95
- Idioma
- English
- Visualizações
- 36
- Etiquetas
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