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Chem Exam
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Preguntas del test (58)
1Which species has 12 protons, 10 electrons and 12 neutrons?
- Amagnesium atom, Mg
- Bneon ion, Ne2+
- Cmagnesium ion, Mg2+
- Dmagnesium ion, Mg2-
2Which of the following correctly describes the difference between a strong acid and a weak acid?
- AAll solutions of weak acids are poor conductors of electricity but solutions of strong acids are always good conductors of electricity.
- BConcentrated solutions can only be prepared from strong acids.
- CThe degree of ionisation of strong acids is greater than for weak acids.
- DWeak acids are less soluble than strong acids.
3Which of the following pure substances contains covalent bonds?
- AMgCl2
- BH2O2
- CZnO
- DAl
4Equal volumes of three different 1.0 mol L-1 solutions are combined. Upon mixing the colourless mixture turned cloudy white. Which of the following three solutions would give this result?
- Acopper nitrate, sodium sulfate and potassium carbonate
- Bsodium sulfate, ammonium nitrate and potassium iodide
- Cbarium nitrate, calcium chloride and potassium iodide
- Dbarium nitrate, potassium sulfate and sodium chloride
5Which is the correct IUPAC name
- A2,3-methyl-but-3-ene
- B2,3-dimethyl-but-3-ene
- Ctrans-2,3-dimethyl-but-1-ene
- D2,3-dimethyl-but-1-ene
6Choose the correct statement about the compounds CH3CH2CH2CH3 and (CH3)3CH.
- AThey would have identical physical properties
- BThey are isomers
- CCH3CH2CH2CH3 is an alkane and (CH3)3CH is an alkene.
- DThey are unsaturated hydrocarbons
7Acid + base ------> [blank_start]salt + H2O[blank_end]
Acid + carbonate ------> [blank_start]salt + H2O + CO2[blank_end]
Acid + metal ------> [blank_start]salt + H2[blank_end]
Metal carbonate + heat ------> [blank_start]metal oxide + CO2[blank_end]- Asalt + H2O
- Bsalt + H2O + CO2
- Csalt + H2
- Dmetal oxide + CO2
- Esalt + H2O + CO2
- Fsalt + H2O
- Gsalt + H2
- Hmetal oxide + CO2
- Isalt + H2
- Jsalt + H2O
- Ksalt + H2O + CO2
- Lmetal oxide + CO2
- Mmetal oxide + CO2
- Nsalt + H2O
- Osalt + H2O + CO2
- Psalt + H2
8acid + base =
- Asalt + H2O
- Bsalt + H2O + CO2
- Csalt + CO2
- Dsalt + H2
9acid + carbonate =
- Asalt + H2O + CO2
- Bsalt + H2O
- Csalt + H2
- DCO2 + H2O
10acid + metal =
- Asalt + H2
- Bsalt + H2O
- Csalt + H2O + CO2
- Dmetal oxide + CO2
11acid + metal hydroxide =
- Asalt + H2O
- Bsalt + H2O + CO2
- CH2
- Dmetal oxide + CO2
12metal carbonate + heat =
- Ametal oxide + CO2
- Bsalt + H2
- Csalt + H2O + CO2
- Dsalt + H2O
13Select the acids
- AHCl
- BH2SO4
- CHNO3
- DNaOH
- ECaCO3
- FMgO
- GKOH
- HLiOH
- IH2CO3
- JCH3COOH
14Select the bases
- ANaOH
- BLiOH
- CKOH
- DHCl
- EH2SO4
- FHNO3
- GCH3COOH
- HCaCO3
- ICaO
- JMgCO3
15Select the carbonates
- ACaCO3
- BNa2CO3
- CMgCO3
- D(NH4)2CO3
- EMgO
- FFeO
- GHNO3
- HH2CO3
- IKOH
16Select the metal oxides
- AMgO
- BFeO
- CFe2O3
- DCaO
- ECaCO3
- FNa2CO3
- GLiOH
- HKOH
- INaOH
17Polysaccharides are comprised of monosaccharides linked by [blank_start]glycosidic[blank_end] bonds
Proteins are comprised of amino acids linked by [blank_start]peptide[blank_end] or amide bonds
DNA is comprised of nucleotides linked by [blank_start]phosphodiester[blank_end] bonds- Aglycosidic
- Bpeptide
- Cphosphodiester
18DNA is made of repeating units called monomers. Each monomer consists of the same 3 components, which are (in alphabetical order):
1. [blank_start]deoxyribose sugar[blank_end]
2. [blank_start]nitrogenous[blank_end] base
3. [blank_start]phosphate[blank_end] group- Adeoxyribose sugar
- Bnitrogenous
- Cphosphate
19Fill in the blanks to show the percentage of each base in a DNA molecule:
thymine - [blank_start]34%[blank_end]
[blank_start]guanine[blank_end] - 16%
adenine - [blank_start]34%[blank_end]
[blank_start]cytosine[blank_end] - [blank_start]16%[blank_end]- A34%
- Bguanine
- C34%
- Dcytosine
- E16%
20Label the parts of the DNA molecule
- Aphosphodiester bond
- Bphosphate group
- Cdeoxyribose sugar
- Dhydrogen bond
- Enitrogenous base
- Fhydrogen bond
- Gphosphodiester bond
- Hdeoxyribose sugar
- Initrogenous base
- Jphosphate group
- Kdeoxyribose sugar
- Lnitrogenous base
- Mhydrogen bond
- Nphosphodiester bond
- Ophosphate group
- Pphosphate group
- Qnitrogenous base
- Rhydrogen bond
- Sphosphodiester group
- Tdeoxyribose sugar
- Unitrogenous base
- Vphosphodiester bond
- Whydrogen bond
- Xdeoxyribose sugar
- Yphosphate group
21Enzymes have different activity levels in different pH conditions because the [blank_start]hydrogen[blank_end] bonds and [blank_start]salt[blank_end] bridges in the tertiary structure of the enzyme's polysaccharides are disrupted by the H+ in [blank_start]acidic[blank_end] conditions and the [blank_start]OH-[blank_end] in alkaline conditions.
- Ahydrogen
- Bsalt
- Cacidic
- DOH-
22The purple circles indicate [blank_start]side[blank_end] chains and the yellow squares indicate [blank_start]peptide[blank_end] bonds.
- Aside
- Bpeptide
23When KCl dissolves in water
- Athe Cl- ions are attracted to dissolved K+ ions
- Bthe Cl ions are attracted to the partial negative charge on the oxygen atom of the water molecule
- Cthe K+ ions are attracted to the partial negative charge on the oxygen atom of the water molecule
- Dthe K+ ions are attracted to the partial positive charge on the hydrogen atoms of the water molecule
24The interactions that link the nucleotides in a nucleic acid are
- Apeptide bonds
- Bhydrogen bonds
- Cglycosidic bonds
- Dphosphodiester bonds
25The solubility of a gas in a liquid
- Adecreases as the gas pressure above the liquid increases
- Bincreases as the gas pressure above the liquid increases
- Cincreases as the temperature increases
- Ddepends on the liquid polarity
26Which of the following statements about trends in the periodic table is/are correct?
i. Atomic Radii generally increase from left to right across the periods
ii. First ionisation energies decrease down the groups
iii. electronegativities increase from left to right across the periods- Ai only
- Bii and iii only
- Ciii only
- Di, ii, and iii
27In the period table, atomic radii generally increase from left to right across the periods
- AVerdadero
- BFalso
28In the periodic table, first ionisation energies decrease down the groups
- AVerdadero
- BFalso
29In the periodic table, electronegativities increase from left to right across the periods
- AVerdadero
- BFalso
30The pH at which an indicator changes colour is known as its
- Astandard point
- Btransition point
- Cequivalence point
- Dend point
31Which of the following statements about this reaction is true?
- ASulfur atoms are being reduced
- BSome of the hydrogen atoms are being reduced
- CManganese atoms are being reduced
- DSome of the oxygen atoms are being oxidised
32A polyunsaturated fatty acid contains more than one
- Acarboxyl group
- Bhydroxyl group
- Clong carbon chain
- Dcarbon-carbon double bond
33Ribulose has the structural formula pictured. To what carbohydrate class does ribulose belong?
- Aaldoterose
- Baldopentose
- Cketoetrose
- Dketopentose
34In a disaccharide, two monosaccharides are joined by what kind of bond?
- Ahydrogen bond
- Bphosphodiester bond
- Chydrophilic bond
- Dglycosidic bond
35Which of the following could be best described as a *dilute* solution of a strong acid?
- Ahydrochloric acid with a pH of 1.1
- Bethanoic acid with a pH of 3.8
- Csulfuric acid with a pH of 6.6
- Dnitric acid with a pH of 0.9
36a 1 mol-L aqueous solution is found to have the following properties:
* It is a good conductor of electricity
* its pH rises when it is diluted with distilled water
* it gives a white precipitate when added to an aqueous solution of silver nitrate
Which of the following is the most likely identity of the solution?- ANH4NO3 (aq)
- BNaCl (aq)
- CHCl (aq)
- DK3PO4 (aq)
37Acids and bases denature of a protein by disrupting which of the following?
- Apeptide bonds and salt bridges
- Bhydrophobic interactions and peptide bonds
- Csalt bridges and hydrophobic interactions
- Dsalt bridges and hydrogen bonds
38Which of the following is NOT TRUE for a competitive inhibitor?
- AIt cannot be converted to products
- BIt has a structure similar to the substrate
- Cincreasing the substrate concentration can reverse competitive inhibition
- Dit binds to the enzyme at a site remote from the active site
39A solution at 25 degrees C has a pH of 4.0. What is the [OH-]?
- A1 x 10^-10 mol L-1
- B10.0 mol L-1
- C1 x 10^-14 mol L-1
- D1 x 10^-4 mol L-1
40With the aim of increasing the yield, the factory operator decided to use a low temperature and a high pressure. Which reaction/s would most benefit from these conditions, in terms of an increased yield?
- ASteam reforming
- BShift reaction
- CHaber process
- DSteam reforming and shift reaction
41The following diagram shows a few of the main species present in an aqueous solution of methylamine. Four of the bonds or intermolecular forces are indicated by dashed or solid lines. Name each bond or intermolecular force:
- Adispersion force
- Bhydrogen bond
- Cion-dipole force
- Dcovalent bond
42In a heating curve, there is no temperature increase during [blank_start]phase[blank_end] changes because the heat energy being added is being used to break the [blank_start]bonds[blank_end] between particles. Therefore the extra heat added is [blank_start]increasing[blank_end] the potential [blank_start]energy[blank_end] rather than increasing the temperature.
- Aphase
- Bbonds
- Cincreasing
- Denergy
43Non-polar, tetrahedral ------- [blank_start]SiF4[blank_end]
Polar, linear ------- [blank_start]HCl[blank_end]
Polar, bent ------- [blank_start]SO2[blank_end]
Both polar & non-polar covalent bonds ------- [blank_start]CH3CH2OH[blank_end]
Non-polar, trigonal planar ------- [blank_start]SO3[blank_end]- ASiF4
- BHCl
- CSO2
- DCH3CH2OH
- ESO3
44Complete the table by writing the formula for the conjugate base, species X, or conjugate acid in each blank space as appropriate. Species X is the species that is able to form both the respective conjugate acid and conjugate base.
- ANH3
- BNH4+
- CHSO3-
- DSO32-
- EHPO42-
- FH3PO4
45Complete the table by writing the formula for the conjugate base, species X, or conjugate acid in each blank space as appropriate. Species X is the species that is able to form both the respective conjugate acid and conjugate base.
Hint: Bases can accept protons/donate a pair of valence electrons, so bases will have a negative charge and fewer protons than species X or their conjugate acid.- ANH3
- BNH4+
- CHSO3-
- DSO32-
- EH3PO4
- FHPO42-
46Label the functional groups
- Aalcohol
- Bcarboxylic acid
- Camine
- Dketone
47Label amino acid X in basic solution, acidic solution, and neutral solution (as a zwitterion)
- Aacidic solution
- Bbasic solution
- Cneutral solution
48Select the SECONDARY structures/forces (some may be both secondary & tertiary)
- Aalpha helix
- Bbeta pleated sheet
- Chydrogen bonds
- Ddisulfide bridge
- Edipole-dipole forces
- Fionic bonds
49Select the TERTIARY structures/forces (some may be both secondary & tertiary)
- Aalpha helix
- Bbeta pleated sheet
- Chydrogen bonds
- Ddisulfide bridge
- Edipole-dipole forces
- Fionic bonds
50Considering that 'like dissolves like', select which of the following substances are likely to dissolve in water (3)
- AC4H10
- BCHCl3
- CN2
- DCH3OH
- EPH3
- FC2H2
- GCO2
51Which of the following statements is true about this potential energy diagram?
- AThe enthalpy change is negative, the reaction is exothermic, which means it releases energy into the surroundings = the products are lower in energy than the reactants.
- BThe enthalpy change is positive, the reaction is endothermic, which means it absorbs energy from the surroundings = the products are higher in energy than the reactants.
52Which statements are correct?
- AThe enthalpy change is negative
- Bthe reaction is exothermic
- Cthe reaction releases energy into the surroundings
- Dthe products are lower in energy than the reactants
- EThe enthalpy change is positive
- Fthe reaction is endothermic
- Gthe reaction absorbs energy from the surroundings
- Hthe products are higher in energy than the reactants
53Which statements are correct?
- AThe reaction is endothermic
- BThe change in enthalpy is positive
- CThe reactants have lower energy than the products
- DThe reaction absorbs energy from the surroundings
- EThe reaction is exothermic
- FThe change in enthalpy is negative
- GThe reactants have higher energy than the products
- HThe reaction releases energy into the surroundings
54Label the points on the potential energy diagram of this exothermic reaction
- Areactants
- Btransition state
- CEa
- Dchange in H
- Eproducts
55Label the points on the potential energy diagram of this endothermic reaction
- Areactants
- Bproducts
- Ctransition state
- DEa
- Echange in H
56Catalysts increase the initial reaction rate because they [blank_start]lower[blank_end] the [blank_start]activation[blank_end] energy for the reaction. As a result, more collisions have an energy greater than or equal to the activation energy therefore there are more successful collisions.
- Aactivation
- Blower
57Which of the following is non-polar but consists of molecules in which there are polar covalent bonds?
- AAmmonia, NH3
- BTetrachloromethane, CCl4
- CHydrogen chloride, HCl
- DWater, H2O
58In radiation;
An alpha particle is a [blank_start]helium nucleus[blank_end] with a [blank_start]+2[blank_end] charge and [blank_start]high[blank_end] ionising ability
A beta -ve particle is an [blank_start]electron[blank_end] with a [blank_start]-1[blank_end] charge and [blank_start]moderate[blank_end] ionising ability
A beta +ve particle is an [blank_start]positron[blank_end] with a [blank_start]+1[blank_end] charge and [blank_start]moderate[blank_end] ionising ability- Ahelium nucleus
- Belectron
- Cpositron
- Dneutron
- E+2
- F-2
- G+1
- H-1
- Ihigh
- Jmoderate
- Klow
- Lelectron
- Mpositron
- Nhelium nucleus
- O-1
- P+1
- Q+2
- R-2
- Smoderate
- Thigh
- Ulow
- Vpositron
- Welectron
- Xneutron
- Yhelium nucleus
- Z+1
- AA-1
- AB+2
- AC-2
- ADmoderate
- AElow
- AFhigh
- AGneutron
Información
- Descripción
- Bachelor Degree Biomedical Science Test sobre Chem Exam, creado por Crystal CP el 12/06/2021.
- Autor
- Crystal CP
- Idioma
- English
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- Historial
- Creado el 12 jun 2021 · actualizado el 15 jun 2021
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