Kjemi Flashcards
For neutralization of 6 cm3 of acetic acid solution was used 12 cm3 of NaOH with concentration 0.2 mol. dm-3. What is the concentration of acetic acid
0.40 mol. dm - 3
How many valence electrons are in the atom of an element with a proton number
6
Select the vitamin needed for blood coagulation
Phylloquinone
An aqueous HCI solution has a concentration of 4.1 mol.dm-3. The solution density is 1068 g.dm-3. Calculate the mass of HCI contained in 120g of the solution. (Mr(HCI)= 36.5):
16.8g
Select the name of heterocycle in the following picture: N-N_h
Imidazole
Select a name of the compound: OH -HO-H
D-glucopyranose
A compound with the following formula tas formed by a reaction of: CH3 -CH (OH) - O -CH2 -CH3
no answer is correct
Provide the name for a peptide shown in the picture: HO - CH3 - NH2 - 0 - NH - NH2- HO - O
threonyllysine
Select the reaction of the tricarboxylic acid cycle, at which NADH is formed:
Conversion of 2-oxoglutarate to succinyl-CoA
The value of the ionic product of whater, Kw, at 25°C is:
1.0 x 10 -14
You need to prepare a 10% solution of sucrose from 200g of 30% solution. What mass of water is necessary to add?
600g
Select the redox reaction from the following:
No answer is correct
An isotope of oxygen 18O contains:
8 protons - 10 neutrons
Conversion of propane-2-ol to acetone is:
Dehydration
Select a solution at which the concentration of chloride anions is the same as in the solution of FeCI3 with a concentration of 2 mmol.dm-3:
CaCI2, c= 6 mmol.dm-3
250 mL of a hydrogen peroxide solution contains 40g of H2O2 (Mr=34). What is the molar concentration of the solution?
4.70 mol. dm -3
Enzymatic hydration of fumaric acid will produce:
Malic Acid
Which of the following aqueous solutions will have a neutral pH value?
No answer is correct
Calculate the number of H2O molecules contained in 228 cm3 of water. Density of water is 1g/mL.
7.63 X 10 24
Which of the following species does not display acidic properties in an aqueous solution:
H20
Wich of the following compounds is a six-membered heterocycle with two nitrogen atoms?
Imidazole
A solution of HNO3 (50 cm3, c=0.1 mol/L) was diluted by addition of 450 mL of water. What is the pH of the solution?
2
Select a true statement about DNA:
Opposite nucleotides in double helix are held by hydrophobic bonds between bases
Provide the correct names for the three amino acids whose structural formulas are below:
Asparagine, leucine, proline
A pH value of HCI solution is 2.5; what is the concentration of the solution?
No answer is correct
Select a correct statement about amines:
aniline belongs to the group of primary amines
Select the biochemical conversion that is catalyzed by oxidoreductase enzymes:
conversion of ethanol to acetaldehyde
Which of the following elements has the electron configuration (Ar)4s24p5:
p
What is the formula of the compound whose name is iron (III) hydrogen sulfide?
Fe(HS)3
Which of the following compounds would provide H+ in an aqueous solution?
Methylamonium cholride
In 500 cm3 of a solution is dissolved 120g of acid. The solution density is 1180 g.dm-3. What is the mass fraction of the acetic acid in the solution?
0.10
Select the name of the compound: HO - OH -OH - N - N -N -N NH2
Adenosine
Calculate the mass of nitrogen contained in 17 grams of amino acid alanine: (Ar(H)=1, Ar(N)=14, Ar(O)=16.
2.67
Calculate the volume of H2 that will be released in reaction of sulfuric acid with 5g of zinc. Ar(Zn)= 65; consider the standard conditions and properties of an ideal gas.
1.72 dm3
Select an ionic compound among the following:
CaCI2
Which of the following molecular formulas represents a correct formula of toluene?
No answer is correct
The residue C6H5-CH2- is named:
Benzyl
Select a monocarboxylic acid among the following:
Pyruvic
Hydrolytic cleavage of the compound on the right will provide: CH3-CH2-O-CO-CH2-CH2-CH3.
Ethanol + butanoate
Select an amino acid that has a molecular formula C5H11NO2S:
Cysteine
Select the formula of copper(I) nitrite:
CuNO2
Select the formula of calcium hypochlorite
Ca(CIO)2
Select the formula of barium manganate:
BaMnO4
Select the formula of magnesium hydrogen sulfite:
No asnwer is correct
Select the formula of iron (II) phosphate:
Fe3(PO4)2
Select the formula of chromium(III) hydrogen sulfate:
Cr(HSO4)3
Select the formula of magnesium diphosphate:
Mg2P22O7
Select the formula of barium sulfite:
BaSO3
Select the formula of calcium hydrogen phosphate:
CaHPO4
Calculate the mass fraction of oxygen, w(O), in hydrogen peroxide:
0.94
Calculate the mass fraction of oxygen, w(O), in glucose (Mr=180):
0.53
Calculate the mass fraction of nitrogen, w(N), in ammonium nitrate (Ar(N)= 14,0):
35.0%
Calculate the mass of potassium in 87g of anhydrous potassium sulfate (Ar(K)= 39,1; Ar(S)= 32,1):
39.0g
Calculate the mass of silver in 3,50g of silver nitrate (Ar(Ag)= 180; Ar(N)= 14,0):
2,22g
Calculate the mass of calcium sulfate containing 10g of calcium (Ar (Ca)= 40,1; Ar(S)= 32,1:
34.0g
The Avogadros constant expresses:
the number of particles in one mole of substance
Calculate the substance amount in 1g of tetrachloromethane (Ar(CI)= 35,5)
6,49 mmol
Calculate the substance amount in 1kg of water:
55.5 MOL
Calculate the number of oxygen atoms in 0,4 mol of KNO3:
NO ANSWER IS CORRECT
Calculate the number of hydrogen atoms in 1g of water:
6.69.10 (22)
Calculate the mass of 6,72 m3 of nitrogen (t=0°C, p= 101,3 kPa) (Ar(N)= 14,0)
8.40KG
Calculate the mass of 3,36 m3 of helium (t=0°C, p= 101,3 kPa)
600g
Calculate the mass of CO2 produced by the complete combustion of 20g of ethyne (acetylene):
67,7g
Calculate the mass of CO2 produced by the complete combustion of 1g of glucose (Mr=180):
0,60g
Calculate the volume of hydrogen (t=0°C, p= 101,3kPa) released from 16,35g of zinc in excess of hydrochloric acid (Ar(Zn)= 65,4):
5,60dm 3
Calculate the volume of CO2 produced by the complete combustion of 9g of ethyne (acetylene) (t=0°C,p= 101,3kPa):
15,5dm 3
Determine the number of neutrons in 35 (17)CI nuclide:
18
Determine the values of the subshell quantum number I, if n= 3:
- 2, - 1- 0- +1 -+2
Select the electron configuration of aluminium:
(He) 2s (2) 2p(1)
Which element has the electron configuration (Ne) 3s(2) 3p(1)?
Boron
Which element has the electron configuration (Ne) 3s(2) 3p(2)?
P
How many electrons are there in the valence sphere of sulfur atom?
16
How many valence electrons are there in the element with proton number of 17?
7
How many valence electrons are there in the element with proton number of 15?
5
How many valence electrons are there in the element with proton number of 19?
No answer is correct
Which element belongs to the p2 elements?
Sn
Which element belongs to the p3 elements?
Sb
Which element belongs to the p4 elements?
Se
Locate the least electronegative elements in the periodic table:
Left bottom part of the table
Select the compound with covalent bonds:
SiO2
What is the shape of molecule with sp-hybridized central atom?
Linear
What is the shape of molecule with sp3-hybridized central atom?
Tetrahedral
Select the complex compund:
Na3FeF6
Select the substance with intermolecular hydrogen bonds:
H2O
Select the substance with intermolecular hydrogen bonds:
H2O
Select the ionic compound:
MgO
Select the ionic compound:
KBr
Select the ionic compound:
CaO
Calculate the mass of glucose in 240g of 0,80% solution:
No answer is correct
Calculate the mass % of the solution prepared from 3kg of substance and 12kg of water:
20%
Calculate the mass % of the solution prepared from 600g of NaOH and 2,4kg of water:
20%
Calculate the mass of water needed to make 10% solution from 2kg of 40% solution:
No answer is correct
Calculate the mass of water needed to make 20% solution from 50kg of glucose:
No answer is correct
Calculate the mass of NaCI needed to make 40% solution from 3kg of water:
1200g
Calculate the mass of sucrose needed to make 25% solution from 3kg of water:
750g
200 cm3 of solution contains 10g of alanine (M= 89,0). The molarity of alanine is:
0,56 mol. dm - 3
What volume of 2 M H2SO4 contains 40mmol H2SO4?
20 cm3
Calculate the mass of NaCI after evaporating 250 cm3 of 0,5M solution (Mr= 58,5):
7.31g
Calculate the mass of iron(II) chloride in 300 cm3 of 0,1M solution (Ar(Fe)= 55,8; Ar (CI)= 35,5):
3,80g
Calculate the mass of NaOH in 400 cm3 of 0,25M solution (Ar(Na)= 23,0):
4g
Calculate the mass of HCI (Mr= 36,5) in 120g of 4,1M solution (Solution density 1068 g.dm-3):
18.6g
To neutralize 16 cm3 of 0,5M HCI you need:
20 cm3 of 0,40M NaOH
To neutralize 100 cm3 of 0,2M sulfuric acid you need:
80 cm3 of 0,25M Ba (OH) 2
To neutralize 250 cm3 of 0,20M KOH you need:
250 cm3 of 0,10M sulfuric acid
To neutralize 80 cm3 of 10mM calcium hydroxide you need:
4cm3 of 400mM HCI
Calculate the volume of 0,2M HCI needed to neutralize 0,404g of KOH (Mr= 56,1):
36,0 cm3
Electrolytic dissocsiation is:
Decomposition of substance to positive and negative ions
Select the strong electrolyte:
NH4CI
Select the weak electrolyte:
NH3
What is the molarity of NaCI, if the concentration of sodium ions is 150 mmol.dm-3?
150 mmol. dm - 3
NaOH solution has pH= 12,0. Calculate the molarity of sodium ions:
10 mmol. dm - 3
Calculate the concentration of chloride ions in 15mM barium chloride:
30 mmol. dm - 3
What is the molarity of sodium sulfate solution, if sodium ion concentration in this solution is 18 mmol.dm-3?
9 mmol. dm-3
The molarity of potassium sulfate solution is 0,04 mol.dm-3. What volume of this solution contains 1 mmol of potassium ions?
12,5 cm3
The value of the ionic product of water Kw is:
1,0.10(-14)
Select the species which can be a Brønsted acid in aqueous solution:
HPO4 (2-)
Consider dissolving ammonia in water. Which species makes the conjugate pair with ammonia?
NH4 (+)
Consider dissociation of acetic acid in water. Which species makes the conjugate pair with CH3COO-ion?
H+
Which species makes the conjugate pair with CH3 -NH2 in aqueous solution?
OH-
Select the conjugate pair:
HCOOH; HCOO-
Select the conjugate pair:
H2O; H3O+
Select the weak acid:
H3BO3
Which acid is not the weak one?
HBr
s there a strong acid among the following compound?
C6H5OH
Calculate the concentration of OH-ions, if pH= 9,0:
1.10(-5) mol.dm-3
What is the pH of calcium hydroxide solution, if c= 2 mmol.dm-3?
11,30
NaOH solution has pH= 11,0. Calculate the pH, if the solution is diluted by adding 9 volume portions of water:
10,0
Hydrochloric acid, pH= 2,60, was diluted 4x, that is by adding threefold volume of water. Calculate the concentration of H+ ions in diluted solution:
0,63.10(-3) mol.dm-3
Hydrochloric acid, c= 0,01mol.dm-3, was diluted by adding the same volume of water. What is the pH of diluted acid?
2,30
Select the salt which undergoes hydrolysis in aqueous solution:
Fe(NO3)3
Which substance provides alkaline aqueous solution?
CH3COONa
Which substance provides alkaline aqueous solution?
NaHCO3
Which substance provides alkaline aqueous solution?
No answer is correct
Which aqueous solution (cocentration of each 0,1 mol.dm-3) can react with the same volume of HCI (0,1 mol.dm-3) to give solution with pH= 7,0?
No answer is correct
How many valence electrons are there in phosphorus?
5
Select non-transition element:
no answer is correct
Select the element from the group VI (14) of periodic system:
tin
Select the element from the group VI (16) of periodic system:
No answer is correct
Select the transient element (d-element):
no answer is correct
Select the acidic (acid-forming) oxide:
Mn2O7
Select the acidic (acid-forming) oxide:
GrO3
Select the amphoteric oxide:
AI2O3
The volume fraction of CO2 in air is:
0,03%
What is the product of the reaction between hydrochloric acid and sodium
Sulfane
Select the formula of gypsum (plaster):
CaSO4.0,5H2O
Determine the concentration of CaSO4 in its satutared aqueous solution, if you know the solubility product Ks (CaSO4)= 3,0.10(-5) mol2.dm-6.
5,5.10(-3) mol.dm-3
The solubility of lead sulfate is given by the solubility product Ks (PbSO4)= 2,0.10(-8) mol2.dm-6. Calculate the substance amount of PbSO4 needed to make 1dm3 of saturated solution in water.
1,4.10(-4) mol
Select the redox reaction:
Ba + Cl2 → BaCl2
Complete the equation 2 Cu(2+) + … I → … CuI + … I2 with the lowest stoichiometric coefficients and express the coefficient of I:
4
Complete the equation … SO2 (g)+ … O2 (g)→ ….. and determine how many mols of SO2 are oxidized by one mol of dioxygen:
2 MOL
Complete the stoichiometric coefficients a, b, c in equation a NH3 + b Cl2 → c NH4Cl + N2:
8; 3; 6
Determine the correct name of hydrocarbon:
2, 2, 4-trimethylpentane
Determine the correct name of hydrocarbon:
2-ethylpent-1-ene
Determine the correct name of hydrocarbon:
4-methyl-3-propylhex-1-ene
Determine the correct name of hydrocarbon:
diphenylmethane
Determine the correct name of the residue -CH2 -CH2-:
diethyl
Vinyl is:
Monovalent residue of ethene
Determine the name of CH3 -CO-O-CH2 CH2 CH2 CH3:
butyl acetate
Determine the name of the given compound:
Bromo-2-chloro-2-methylpentane
Determine the number of isomers of tetrachlorobenzene:
NO ANSWER IS CORRECT
Determine the number of isomeric dihydroxybenzoic acids:
6
Select the isomer of xylene:
Ethylbenzene
Find the isomer of methyl acetate:
Propionic acid
Find the isomer of cyclohexene:
Hexa-2,4-diene
Diethyl ether and butan-2-ol are:
Constitutional isomers
Find the tautomer of vinylalcohol:
Acetaldehyde
Find cis-trans isomers:
Fumaric acid + maleinic acid
Two enantiomers differ in:
Direction of optical rotation
Rotation along C-C bond in a part of molecule affords:
Various conformations
Select the principal feature of electrophilic reagent- an electrophil has:
Unoccupied valence orbital
Nucleophilic reagent is characterized by:
Nonbonding electron pair
Alkenes typically exhibit addition reactions. Select the reagent which does not react with alkenes:
No answer is correct, all reagents can add to alkenes
Determine the name of hydrocarbon:
No answer is correct
Select the molecular formula of styrene:
C8H8
Select the molecular formula of 1,3-cyclohexadiene:
C6H8
Which compound is produced by the oxidation of toluene?
Benzoic acid
Select the least polar compound:
Cyclohexadiene
Select the molecular formula of phenanthrene:
C14H10
Select the molecular formula of naphalene:
No answer is correct
Select the molecular formula of anthracene:
C14H10
Select the product of reaction: but-1-ene + HCI:
2-chlorobutane
Select the product of addition of water to cyclohexene:
No answer is correct
Select the systematic name of chloroform:
NO ANSWER IS CORRECT
How many hydrogen atmos are there in the structure depicted?
NO ANSWER IS CORRECT
The compound HO-CH2-CH2-OH belongs to:
Primary alcohols
Find the secondary alcohol:
Pentane-3-ol
Determine the number of carbon atoms in benzylalcohol:
7
Isopropylalcohol can be made by the reduction of:
ACETONE
Fine the product of glycerol oxidation:
2,3-dihydroxypropanal
Fine the product of benzene-1,4-diol dehydrogenation:
1,4 BENZOQUINONE
Fine the product of glyceraldehyde reduction:
PROPANE-1, 2, 3 -TRIOL
Fine the product of benzaldehyde reduction:
No answer is correct
Which compound is easily oxidized under mild conditions:
CH3 CH2 CH2-CH= O
Find the product of cyclohexanone reduction:
cyclohexanol
Acetal is formed by:
reaction of alcohol and aldehyde
the compound H2N-CH2-CH2-NH2 belongs to:
primary amines
Determine the name of (CH3)3N:
Trimethylnitrile
Find the formula of nitro compound:
C6 H5-O-NO2
Find the product of nitrobenzene reduction:
Phenol
Find the correct description of diazotization:
Diazonium salts are decomposed to phenol and nitrogen
Find the group typical for azo-compounds:
-N=N-
Select the carboxylic acid from the following acids:
Phthalic acid
Find the unsaturated (alkenoic) acid:
No answer is correct
The simplest dicarboxylic acid is:
Oxalic
Which acid is not dicarboxylic?
No answer is correct, all acids are dicarboxylic
Find the tricarboxylic acid:
No answer is correct
The compound CH3-CO-CH2-CO-O-CH2-CH3 belongs to:
Esters
Determine the correct name of the structure depicted:
Phenyl acetate
Select the hydroxy carboxylic acid:
No answer is correct
What is produced by the dehydrogenation of lactic acid?
Pyruvic acid
Select the true statement: Esters can be made from hydroxy carboxylic acids
With acids and alcohols
Determine the product of oxidation of lactic acid:
no answer is correct
What is the common name of CH3-CO-CH2-COOH?
Acetoacetic acid
Urea is derived from:
H2CO3
Which compound is chiral and exhibits optical rotation?
Malic acid
Find the common name for HOOC-CH2-CH(OH)-COOH:
No answer is correct
Which heterocycle does not contain heteroatom of oxygen?
Pyrazole
Select the name of the heterocycle depicted:
No answer is correct
Select the name of the heterocycle depicted:
No answer is correct
Which of the compounds is five-membrered heteroocycle with two N atmos?
Pyrazole
How many nitrogen heteroatomes are there in pyrimidine?
2
Select the name of the heterocycle depicted:
Pyrimidine
Select the name of the heterocycle depicted:
indole
Select the name of the heterocycle depicted:
Purine
Find the molecular formula of indole:
C8 H7 N
Finde the molecular formula of imidazole:
C3 H4 N2
How many nitrogen heteroatoms are there in purine?
4
Which heterocycle contains two different heteroatoms?
THIAZOLE
Select the five-membered heterocycle with two N atoms?
PYRAZOLE
Select the name of the heterocycle depicted:
PYRAN
Select the name of the heterocycle depicted:
No answer is correct
How many chiral atoms are there in acyclic (Fisher) structure of D-ribose?
3
How many chiral atoms are there in acyclic (Fisher) structure of D-galactose?
4
Select the name of monosaccharide:
B-D-ribofuranose
Select the type of bond in polysaccharides:
Glycosidic
Hydrolytic cleavage of lactose provides:
Glucose + galactose
Hydrolytic cleavage of lactose provides:
Glucose + fructose
Select the non-reducing saccharide:
No answer is correct
Select the reducing disaccharide:
MALTOSE
Select the pair of reducing sugars:
FRUCTOSE + MALTOSE
Which polysaccharide is not D-glucan?
No answer is correct, all are D-glucans
Which compund is not polysaccharide?
No answer is correct, all are polysaccharides
Systematic name of palmitic acid is:
Hexadecanoic acid
The hydrogenation of oleic acid gives:
Stearic acid
Select the common name of cis,cis-9,12-octadecadienoic acid:
No answer is correct
Select the common name of cis-9-octadecenoic acid:
Oleic acid
Soaps are:
The salts of higher fatty acids
Soaps are made by:
NO ANSWER IS CORRECT
Which natural substances often contain choline?
Phospholipids
Select the purine base:
Guanine
Which heterocycle makes the skeleton of cytosine?
Pyrimidine
What are the components of nucleosides?
Nitrogen base and pentose
Which compound is not nucleoside:
Cytosine
What type of bond is between base and other parts of nucleotide?
Glycosidic
What type of bond is between nucleotides in nucleic acids?
Ester
Transcription is the transfer of information from the nucleotide sequence..
No answer is correct
Transcription is the transfer of information from the nucleotide sequence..
of mRNA into primary protein structure on ribosome
Select the common name of amino acid depicted:
leucine
Select the common name of amino acid depicted:
Serine
Select the common name of amino acid depicted:
Aspartic acid
Select the name of compound depicted:
Proline
Determine the common name for 2,6-diaminohexanoic acid:
Lysine
Select the common name of amino acid depicted:
Lysine
Select the common name of amino acid depicted:
Tryptophan
Select the common name of amino acid depicted:
Tyrosine
Determine the number of chiral C atoms in serine:
1
Select the correct name of dipeptide shown:
Leucyl-valine
Select the correct name of dipeptide shown:
Lysyl-serine
What type of bond is typical for proteins?
peptide
Which interaction stabilizes the secondary structure of proteins?
Hydrogen bonds
Which interaction is not involved in the stabilization of tertiary protein structure?
Peptide bonds
Enzymes catalyzing the cleavage of peptide bonds in proteins belongs to:
Hydrolases
Trypsin is enzyme which catalyzes:
No answer is correct
Amylase, catalyzing the cleavage of glycosidic bonds in starch, belongs to:
Hydrolases
