Chemistry Trivia Questions — page 3
287 trivia questions with answers, all ages. Multiple-choice trivia with answers, sorted by topic and level. Reveal the answers below, pick one at random, or present them full-screen.
- 101.
Chemists often ascribe the macroscopic properties of solids to the underlying microscopic structure. Silicon carbide is almost as hard and brittle as diamond. The solid state structure of silicon carbide is often described as
- Aa molecular crystal
- Ba metallic crystal
- Can ionic crystal
- Da covalent or network crystal
Answer: a covalent or network crystal - 102.
A solution is prepared by dissolving 30.0 grams of Ni(NO3)2 in enough water to make 250 mL of solution. What is the molarity of this solution?
- A6.3 × 10^-3 molar
- B3.3 molar
- C0.496 molar
- D0.656 mol/L
Answer: 0.656 mol/L - 103.
Which net ionic equation below represents a possible reaction that takes place when a strip of magnesium metal is oxidized by a solution of chromium (III) nitrate?
- AMg(s) + Cr3+ → Mg2+ + Cr(s)
- B3Mg(s) + 2Cr(NO3)3(aq) → 3Mg2+(aq) + 2Cr(s) + NO3-(aq)
- CMg(s) + Cr(NO3)3(aq) → Mg2+(aq) + Cr3+(aq) + 3NO3-(aq)
- D3Mg(s) + 2Cr3+ → 3Mg2+ + 2Cr(s)
Answer: 3Mg(s) + 2Cr3+ → 3Mg2+ + 2Cr(s) - 104.
Which of the following geometries corresponds to a substance that has five sigma bonds and one nonbonding pair of electrons?
- AOctahedron
- BSquare planar
- CSquare pyramid
- DTetrahedron
Answer: Square pyramid - 105.
The ideal gas law is successful for most gases because
- Avolumes are small
- Broom temperature is high
- Cgases are dimers
- Dgas particles do not interact significantly
Answer: gas particles do not interact significantly - 106.
The magnetic moment (μI) of an unknown nuclide is 2.884 x 10^-27 J T-1. Given the nuclear spin is known to be 1, identify the unknown nuclide.
- A14N
- B19F
- C2H
- D6Li
Answer: 2H - 107.
The standard state for redox reactions includes
- Apartial pressures of gases are 1 atmosphere
- Ball of the above are true
- Cconcentrations of soluble species are 1 molar
- Dthe temperature is 25 °C
Answer: all of the above are true - 108.
Considering 0.1 M aqueous solutions of each of the following, which solution has the lowest pH?
- ANa3PO4
- BNa2CO3
- CNaCl
- DNa2S
Answer: NaCl - 109.
The rate, r, of a zero-order chemical reaction A → B can be expressed as which of the following?
- Ar = k ln[A]
- Br = k [A]^2
- Cr = k [A]
- Dr = k
Answer: r = k - 110.
Of the following oxo acids, which is predicted to be the strongest acid?
- AHClO3
- BHIO
- CHClO
- DHBrO
Answer: HClO3 - 111.
The solid-state structures of the principal allotropes of elemental boron are made up of which of the following structural units?
- AB4 tetrahedra
- BB6 octahedra
- CB8 cubes
- DB12 icosahedra
Answer: B12 icosahedra - 112.
The units for the rate of a chemical reaction are
- AL2 mol-2 s-1
- Bit depends on the particular reaction
- CL mol-1 s-1
- Dmol L-1 s-1
Answer: mol L-1 s-1 - 113.
Which of the following has an octet of electrons around the central atom?
- ASF6
- BNH4+
- CBF3
- DPF5
Answer: NH4+ - 114.
The number of allowed energy levels for the 55Mn nuclide are:
- A5
- B8
- C3
- D4
Answer: 3 - 115.
London dispersion forces are caused by
- Athe uneven electron-to-proton ratio found on individual atoms of a molecule
- Btemporary dipoles created by the position of electrons around the nuclei in a molecule
- Cthe electronegativity differences between the different atoms in a molecule
- Dthe three-dimensional intermolecular bonding present in all covalent substances
Answer: temporary dipoles created by the position of electrons around the nuclei in a molecule - 116.
Potassium-40 is a minor isotope found in naturally occurring potassium. It is radioactive and can be detected on simple radiation counters. How many protons, neutrons, and electrons does potassium-40 have when it is part of K2SO4?
- A21 neutrons, 19 protons, 19 electrons
- B21 neutrons, 19 protons, 18 electrons
- C20 neutrons, 19 protons, 19 electrons
- D19 neutrons, 19 protons, 19 electrons
Answer: 21 neutrons, 19 protons, 18 electrons - 117.
When will Kp and Kc have the same numerical value?
- AAt absolute zero for all reactions
- BWhen the reaction exhibits no change in pressure at constant volume
- CWhen the concentrations are at standard state
- DWhen the concentrations are all 1.00 molar
Answer: When the reaction exhibits no change in pressure at constant volume - 118.
Chlorine is often used to oxidize other substances. It makes a good bleach because it can oxidize many colored compounds. If chlorine is not available, what other substance can be used for oxidizing substances?
- AKMnO4
- BAl
- CZn
- DH2S
Answer: KMnO4 - 119.
A student has a liter of a 0.100 M solution of a strong acid. To prepare a buffer, this should be mixed with
- Aa strong acid
- Ba weak acid
- Ca strong base
- Da weak base
Answer: a weak base - 120.
The molecule with a tetrahedral shape is
- APCl4F
- BCBr4
- CCO2
- DBF3
Answer: CBr4 - 121.
Which of the following statements is not a reason why tetramethylsilane is used as a 1H chemical shift reference.
- AIts protons are quite strongly shielded.
- BIt dissolves in most organic solvents.
- CIts 1H spectrum is a singlet.
- DMost organic compounds do not contain silicon atoms.
Answer: Most organic compounds do not contain silicon atoms. - 122.
Determine the H+(aq) concentration in 1.0 M phenol, C6H5OH, solution. (The Ka for phenol is 1 × 10^-10.)
- A1 × 10^-10 M
- B1 × 10^-3 M
- C1 × 10^-9 M
- D1 × 10^-5 M
Answer: 1 × 10^-5 M - 123.
What is the molar mass of a monoprotic weak acid that requires 26.3 mL of 0.122 M KOH to neutralize 0.682 gram of the acid?
- A147 g mol-1
- B682 g mol-1
- C212 g mol-1
- D4.70 g mol-1
Answer: 212 g mol-1 - 124.
Which of the following molecules is a strong electrolyte when dissolved in water?
- APCl5
- BCH3COOH
- CHC2H3O2
- DHBr
Answer: HBr - 125.
The oxidation number of chlorine in the perchlorate ion, ClO4–, is
- A2
- B-1
- C7
- D-3
Answer: 7 - 126.
Twenty-five milligrams of sucrose (C12H22O11) are dissolved in enough water to make 1.00 liter of solution. What is the molality of the solution?
- A1.36
- B7.3 × 10^-5
- C73.1
- D7.31 × 10^-2
Answer: 7.3 × 10^-5 - 127.
The relationship between the vapor pressure of a liquid and the heat of vaporization is expressed in the
- AGibbs free energy equation
- BRydberg equation
- CClausius-Clapeyron equation
- DArrhenius equation
Answer: Clausius-Clapeyron equation - 128.
The fact that the infrared absorption frequency of deuterium chloride (DCl) is shifted from that of hydrogen chloride (HCl) is due to the differences in their
- Adipole moment
- Bforce constant
- Celectron distribution
- Dreduced mass
Answer: reduced mass - 129.
Which of the following is expected to have the highest electronegativity?
- AW
- BFe
- CS
- DAg
Answer: S - 130.
Of the following atoms, which has the lowest electron affinity?
- AF
- BO
- CSi
- DCa
Answer: Ca - 131.
A sealed, rigid container contains three gases: 28.0 g of nitrogen, 40.0 g of argon, and 36.0 g of water vapor. If the total pressure exerted by the gases is 2.0 atm, what is the partial pressure of the nitrogen?
- A0.50 atm
- B0.40 atm
- C2.0 atm
- D0.33 atm
Answer: 0.50 atm - 132.
What is the NMR frequency of 31P in a 20.0 T magnetic field?
- A54.91 MHz
- B239.2 MHz
- C345.0 MHz
- D2167 MHz
Answer: 345.0 MHz - 133.
S(s) + O2(g) → SO2(g)
- Aadding O2 will change the equilibrium constant
- Bthis reaction goes to completion
- CQ must be close to 1.0 since there is one mole of gas on each side of the equation
- Deither S(s) or O2(g) will be completely used up
Answer: Q must be close to 1.0 since there is one mole of gas on each side of the equation - 134.
The molecular geometry of thionyl chloride, SOCl2, is best described as
- Atrigonal pyramidal
- Btrigonal planar
- CT-shaped
- Dtetrahedral
Answer: trigonal pyramidal - 135.
The Arrhenius equation may be used to determine
- Athe shelf life of a consumer product or drug
- Bthe rate constant at various temperatures
- Call of the above
- Dthe activation energy of a reaction
Answer: all of the above - 136.
PCl3(g) + Cl2(g) ↔ PCl5(g) ΔH = -92.5 kJ/mol In which of the following ways could the reaction above be manipulated to create more product?
- AIncreasing the pressure
- BIncreasing the temperature
- CDecreasing the concentration of PCl3
- DNone of the above
Answer: Increasing the pressure - 137.
A large positive value for the standard Gibbs free energy change (ΔG°) for a reaction means
- Aan extremely fast chemical reaction
- Bnone of the above
- Ca reaction with a very large increase in entropy
- Dthe reaction is thermodynamically favored with virtual complete conversion of reactants to products
Answer: none of the above
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