Opptaksprøve Slovakia - Kjemi
Select the correct formula for ammonium carbonate
(NH4)2CO3
The formation of a solid product in a chemical reaction is represented by the symbol
(S)
Determine oxidation number of metal in K2CO3
+ 1
Assign an oxidation number of a metal in the molecule CaSo4
+ II
Write the usual valence associated with nitrogen in covalent compounds
+ III
Determine oxidation number of carbon in K2CO3
+IV
Draw structural formula of peptide bond
-CO-NH-
Write the usual valence associated with oxygen in covalent compounds
-II
Alcohols are formed by the attachment of
-OH group to hydrocarbon chain
How many electrons are in the 2d subshell ?
0
What is the range of the pH scale from lowest to highest ?
0 to 14
The principal quantum number of an orbital is 4. What are the possible angular momentum quantum numbers ?
0, 1, 2, 3
What is the molar concentation of a solution that contains 0,202 mol KCl in 7,98 L of solution ? Mm(KCl) = 74,55 g * mol -1
0,0253 mol * dm ^-3
Express the following quantity in grams 159,5 mg
0,1595 g
How many mL of 60% acetic acid with density p = 1.0629 g * cm ^-3 do you need to prepare 250 mL 0.02 mol * dm ^-3 solution. Mm(Ch3COOH) = 60 g * mol ^-1
0,47 mL
Express the following quantity in liters 15 mL
0.015 L
What is the molar concentration of a solution made by dissolving 5 g of FeSO4 in water and dilute to a final volume of 500 mL ? Mm (FeSO4) = 152 G * mol-1
0.0658 mol * dm-3
What is the molar concentration of a 100.00 mL aqueous solution that contains 1.00 g KCl ? Mm (KCl) = 74.55 g * mol-1
0.134 mol * dm^-3
What is the molar concentration of a solution that contains 125 g NaCl (Mm = 58.44 g*mol^-1) in 4.00 L solution ?
0.535 mol * dm^-3 NaCl
Give the number of Ione pairs in the molecule of ammonia
1
How many possible orientations does an «s» orbital have ?
1
The noble/gas notation for the electron configuration of bromine is [Ar] 3d10, 4s2, 4p5. How many unpaired electrons are there in an atom of bromine in the ground state ?
1
80 g of NaOH is dissolved in 2000 ml of solution. Calculate the molar concentration of solution. Mm(NaOH) = 40 g*mol-1
1 mol*dm-3
What is the mass in grams of 150*10^12 iron atoms each having an atomic mass of 56 u ?
1,39 * 10 -8 g
What is the mass percentage of table salt in solution if 2,5 g of NaCl is dissolved in 150 g of water?
1,6%
What is the numerical value of atomic mass unit?
1,66*10-27 kg
Name the product of dehydrogenation of 1-hexene
1-hexyne
What is the product of the following reduction reaction ? H3C-CH2-CHO —> ?
1-propanol
Which compounds are isomers?
1-propanol and 2-propanolpp
How many electrons are present in an atom in which the 1s, 2s and 2p subshell's are filled ?
10
When a solution has a pH of 4, what is the pOH of that solution ?
10
How many grams of KCl are needed to prepare 400 g of a 2,5 % saline solution ?
10 g
1 micromol is
10^-6 mol
What is the total number of sigma bonds found in 1-butene ?
11
How many molecules are in 2 mol of O2?
12.044 * 10 ^23
How many nitrogen atoms are in 28 g of nitrogen molecule? Ar(N) = 14
12.044 *10^23
How many moles of carbon monoxide are needed to react completely with 7 moles of oxygen gas to form carbon dioxide ? 2 CO2 (g) + O2 (g) —> 2 CO2 (g)
14
How many protons and electrons respectively are in Cl- (Z=17) ?
17, 18
The maximum number of electrons in the third shell is
18
The electron configuration for the element 5X is
1s2, 2s2, 2p1
The electron configuration notation for the element of atomic number 5 is
1s2, 2s2, 2p1
What is the correct electron configuration for a ground-state atom with 7 electrons ?
1s2, 2s2, 2p3
Give the number of ions pairs in the molecule of nitrogen
2
How many covalent bonds are formed by each atom in the molecule of H2O ?
2
How many enantiomers of glucose do you know ?
2
The number of lone pairs in the molecule of water is
2
What is the total number of pi bonds found in 1,3-butadiene ?
2
Express the following quantity in milligrams: 2 kg
2 000 000 mg
Which equation is not balanced ? A) 2 H2 + O2 —> 2 H2O B) 4 H2 + 2 O2 —> 4 H20 C) H2 + H2 + O2 —> H2O + H20 D) 2 H2 + O2 —> H20
2 H2 + O2 —> H2O
Write the balanced equation for the following acid-base reaction HClO4 + Ca(OH)2 —> ?
2 HClO4 + Ca(OH)2 —> 2 H2O + Ca(ClO4)2
Which coefficients correctly balance the formula equation below ? KClO3 (s) —> KCl (s) + O2 (g)
2, 2, 3
How many atoms are in 3.50 mol of calcium
2.10 x 10^24
How many electrons are present in an atom of calcium that has the electron configuration 1s2, 2s2, 2p6, 3s2, 3p6, 4s_
20
The atom has atomic number 17 and a mass number 37. How many neutrons ideas the atom contain ?
20
How many protons and electrons, respectively are in Ca2+ (Z=20)
20, 18
What is the percent composition by mass of sulfur in ammonium sulfate? Mm(S) = 32 g*mol-1 Mm((NH4)2SO4) = 132 g*mol-1
24%
What is the approximate mass of 1.50 mol of ammonia ? Mm(NH3) = 17 g * mol-1
25,5 grams
How many stages of ionization does phosphoric acid go through ?
3
The number of «p» orbitals in each energy level above the first is
3
Balance the equation H2 (g) + N (g) —> NH3 (g)
3 H2 (g) + N2 (g) —> 2 NH3 (g)
Write the balanced equation for the following acid-base reaction H2SO3 + Ni(OH)3 —>
3 H2SO3 + 2 Ni(OH)3 —> Ni2(SO3)3 + 6 H2O
How many protons and electrons are in an atom of lithium 7 3Li ?
3 and 3
What is the molar concentration of a 500 mL solution that contains 60,0 g of NaOH ? Mm(NaOH) = 40 g*mol-1
3,0 mol * dm -3
How many oxygen atoms are in 16 g of oxygen (O2) ? Ar(O) = 16
3,011 * 10^23
How many grams of NaCl are needed to prepare 250 ml of a 1,5 % saline solution ? Density p(1,5%) = 1,012 g/cm3
3,795 g
Give the name to Cl-CH2-CH2-COOH
3-chloropropanoic acid
How many moles of oxygen are required to burn 22.4 liters of ethane gas at standard conditions ? 2 C2H6 (g) + 7 O2 (g) —> 4 CO2 (g) + 6 H2O (g)
3.5
What is the total number of electrons needed to fill the fourth main energy level ?
32
What volume in dm3 of hydrogen would be required to react exactly with 120 dm3 nitrogen to obtain ammonia from its elements in the gas phase ?
360 dm3
An orbital that would never exist in the quantum description of an atom is
3f
Give the number of lone pairs in the molecule of oxygen
4
Number of chiral (assymetric) carbon atoms which are present in the glucose molecule is
4
The concentration of H+ in solution is 1*10-4. Mol*dm-3 pH of the evolution is
4
What is the total number of molecules that is represented by the following chemical equation ? NH4NO2 —> N2 + 2H2O
4
An electron has the following set of quantum numbers: n = 4 l = 1 m = 0 and s = + 1/2 in which of the following orbitals would this electron be found ?
4f
Which of the following sublevels is the lowest in energy according to the Aufbau principle?
4s
What is the mass of 0,5 mol of calcium carbonate ? Ar(Ca) = 40, Ar(C) = 12, Ar(O) = 16
50 g
How many electrons are there in the 5p subshell?
6
How many electrons is found in an atom ^12 6 C?
6
How many valence electrons are in the atom of sulphuric 16S?
6
What is the total number of electrons in the 2p sub level of a chlorine atom 17Cl in the ground state ?
6
How many molecules are in 1 mol of CO ?
6,022 * 10^23
What is the numerical value of Avogadro constant?
6.023 * 10^23 mol-1
What value of the pH scale is considered to be for neutral liquid ?
7
How many greats of water can be prepared from 8 grams of hydrogen at standard conditions ? Mm(H2O) = 18 g * mol-1 Mm(H2) = 2 g *mol-1 2 H2 (g) + O2 (g) —> 2 H2=
72
The elements of the noble gas family, except for helium, have an outer shell of ... electrons
8
The maximum number of electrons at n=2 is
8
How many grams of sodium chloride are approximately required to prepare 500 mL of a 3.00 mol*dm-3 solution ? Mm(NaCl) = 58.44 g*mol-1
87.7 g
The maximum number of orbitals in the third shell is
9
Which of the following terms does the best describe an ion ?
A charged molecule
What is a example of a homogenous mixture ?
A glass of salt water
Evaporation of mercury is
A physical change
Name the acid, the component of vinegar
Acetic acid
A substance that contains hydrogen and produces H+ ions in aqueous solution is a
Acid
Water solution of FeSO4 is
Acidic
Water solution of NH4Cl is
Acidic
When 20 ml of 1 mol*dm-3 HCl is added to 10 ml of 1 mol*dm-3 NaOH then the resulting solution is
Acidic
The mass number of an atom is determined by
Adding the neutrons and protons
The following reaction can be classified as a H2C = CH2 + HCl —> CH3CH2Cl
Addition
What is the symbol of silver
Ag
Which of the following is not a chemical element ?
Air
Which of the following is the correct formula for aluminum oxide ?
Al2O3
The equation represents an incomplete chemical reaction. What is the product of this chemical reaction ? Al + Cl2 —> ....
AlCl3
R-OH is a general formula for
Alcohol
To which class of organic compounds does the following compound belong to? H3C-CH2-OH
Alcohol
Identify the reactants of esterification
Alcohol and acid
What product do you expect from oxidation of primary alcohol ?
Aldehyde
An element with electron configuration 1s2, 2s2, 2p6, 3s2, 3p6, 4s1 belongs to the..
Alkali metal group
If we remove one hydrogen atom from alkenes, we get
Alkyl group
Hydrocarbon which contains one carbon-carbon triple bond is
Alkyne
The structure below is a R-NH-R
Amine
To which class of organic compound does the following compound belong to ? H3C-CH2-NH2
Amine
Which of the following names is a functional group that is a part of a building block of proteins ?
Amino
Proteins are made up of individual monomers called
Amino acids
Proteins are polymers of
Amino acids
Select the correct name for NH3
Ammonia
What is the correct name for ion NH4+ ?
Ammonium
Name the following compound NH4OH
Ammonium hydroxide
Consider the two equation below. They illustrate that water is H2SO4 (aq) + H2O (l) —> H3O+ (aq) + HSO4- (aq) NH3 (g) + H2O (l) —> NH4+ (aq) + OH- (aq)
Amphiprotic
Silicon is
An element
Which of the following conditions will always increase the rate of a chemical reaction ?
An increase in concentration of reactants
The structure R - CO - O - CO - R' is general formula for
Anhydride
Chloride, sulfate, nitrate are
Anions
A substance that increases the concentration of OH- ions in an aqueous solution is known as a
Arrhenius base
What is the symbol for arsenic ?
As
According to modern periodic law, the chemical properties of the elements are periodic function of their
Atomic numbers
What is the symbol for gold?
Au
Which one of the following could not be a Brønsted-Lowry acid? A) NH4+ B) BF3 C) H3O+ D) H2O
BF3
Which substance is a Lewis acid in the reaction shown by the equation below ? BF3 (aq) + F- (aq) <—> BF4- (aq)
BF3
What salt is formed in the following acid/base reaction? HClO3 + Ba(OH)2 —>
Ba(ClO3)2
Which of the following formulas is the correct one for barium sulphide ?
BaS
The precipitated formed when barium chloride is treated with sulfuric acid is
BaSO4
Which name/formula combination is correct ?
Barium hypochlorite / Ba(ClO)2
Is sodium hydroxide an acid or a base?
Base
Water solution of Li2CO3 is
Basic
C6H6 is molecular formula for
Benzene
This halogen is the only liquid non-metal
Br
Name the straight-chain alkenes having the molecular formula C4H10
Butane
Molecular formula for pentane is
C5H12
Complete the equation CH3-CH2-COOH + NH4OH —>
CH3-CH2-COONH4 + H2O
Identify the acetamide
CH3-CO-NH2
Write the reaction between butyric acid and ethyl alcohol
CH3CH2CH2COOH + CH3CHOH —> H3CH2CH2COOCH2CH3 + H20
Identify the second reactant for the following reaction CH3COOH + X —> CH3COOH2CH2CH3 + H2O
CH3CH2CH2OH
Draw the structure of acetic acid
CH3COOH
Which of the following acids is an organic acid ?
CH3COOH
Identify the reactants for the product CH3CH2CH2OCOCH3
CH3COOH and CH3CH2CH2OH
Write abalance equation for the complete combustion of methane with oxygen
CH4 (g) + 2 O2 (g) —> CO2 (g) + 2 H2O (l)
Select the correct molecular formula for calcium nitrate
Ca(NO3)2
What element is present in all organic compound ?
Carbon
What compounds are produced when ethanol is burned completely in air ?
Carbon dioxide and water
Saturated hydrocarbons have
Carbon-carbon single bonds
What is the correct name of the ion CO3 2- ?
Carbonate
A substance that is used to speed up a chemical reaction but is not used as a part of the reaction is called a
Catalyst
A positively charged ion is called a
Cation
Write the formula for cadmium perchlorate
Cd(ClO4)2
Rusting of iron is a
Chemical change
The decomposition of hydrogen peroxide to water and oxygen is a
Chemical change
The general formula for the alkenes is
CnH2n
The general formula for the alkynes is
CnH2n-2
Name the following compound Co(NO3)3
Cobalt(III)nitrate
Which of these molecules is a protein ?
Collagen
A strong base in an aqueous solution
Completely dissociates into ions
Sodium sulfate is a
Compound
When HClO4 ionizes in water, ClO4- is the
Conjugate base
The symbol Cu represents
Copper
Select the correct name for Cu2O
Copper(I)oxide
A bond that occurs between non-metal and non-metal is called a/an?
Covalent bond
A bond where electrons are shared is called a/an
Covalent bond
In hydrocarbons, the C and H atoms are joined together by
Covalent bonds
A bond between nitrogen (Z = 7) and oxygen (Z = 8) is
Covalent non-polar
Write the formula for copper(II)oxide
CuO
Which of the following are isomers ? A) Propanoic acid and 1,2-propanediol B) Dichloromethane and trichloromethane C) Pentane and 2,3/dimethylbytane D) 1/butane and cyclobutane
D) 1-butane and cyclobutane
Sucrose is made up of
D-fructose and D-glucose
The chemical equation shows the production of calcium oxide and carbon dioxide. CaCO3 —> CaO + CO2 The reaction should be classified as:
Decomposition
The formation of proteins, starches and fats from theirs subunits occurs by a process known as
Dehydration
A protein can be unfolded by a process called
Denaturation
Then acids are dissolved in water they produce ions that help in conducting the electricity. This process is known as
Dissociation
In DNA, bonds beween nucleotides form a compound with a characteristic shape known as a(n)
Double helix
In a reaction, the ions of two compounds exchange places in aqueous solution to form two new compounds, this reaction is called
Double-displacement reaction
Which part of an atom is most directly involved in formation of chemical bond?
Electron
The dehydration of an alcohol produces alkenes. This is an example of
Elimination
A chemical reaction in which the energy is absorbed is called
Endothermic
In the chemical reaction 2 HCl (aq) + Mg (s) <—> MgCl2 (aq) + H2 (g) + heat
Energy is released, so the reaction is exothermic
The name for reaction of carboxylic acid and alcohol under acidic condition is
Esterification
Which compound is saturated ?
Ethane
Vinegar tastes sour because of
Ethanoic acid
Which compound is not in the same homologous series as ethane ?
Ethene
The structure R-CH2-O-CH2-R' is the general formula of
Ether
To which class of organic compounds does the following compound begin ? H3C-CH2-O-CH2-CH3
Ether
A chemical reaction where the energy is released is called
Exothermic
Compounds of this halogen are used as additives in toothpastes
F
True or false? Bases have a pH below 7
False
Fats do not dissolve in water because
Fats are non polar and water is polar
A long chain carboxylic acid is known as
Fatty acid
Fats are composed of
Fatty acids and glycerol
Which element has the highest electro negativity ?
Fluorine
What is a component of ant venom ?
Formic acid
Fructose is
Fruit sugar
What organic compound do brain cells primarily rely on for fuel ?
Glucose
Which of the following compounds does not contain ions ?
Glucose
Which of the following is a pure compound ?
Glucose
The polysaccharide that stores energy in animal is called
Glycogen
Bases have a pH values that is
Greater than 7
The strongest bases are hydroxides of
Group 1 and 2
Identify the group in which all the elements have the valence shell configuration ns2
Group IIA
The element has symbol ^25 13X. Give its group number and period number
Group number = 13 Period number = 3
In a Brønsted-Lowry acid-base reaction, what are transferred from one reactant to another ?
H+ ions
The neutralization of any strong acid and strong base produces mostly
H2O molecules
Write the formula for the conjugative acid of HPO42-
H2PO4-
Which of the following formulas is most likely to be corrected for hydrosulfuric acid ? - H2SO4 - H2S - H2SO4 - SO42-
H2S
Draw an alkenes with a secondary carbon
H3C-CH2-CH2-CH3
The hydronium ion is
H3O+
What is the conjugate acid of water ?
H3O+
Which of the following compounds contain a coordinate covalent bond
H3O+
Which of the following pairs is not a conjugate acid-base pair ?
H3O+ and OH-
Write the balanced equation for the following acid-base reaction H3PO4 + KOH —>
H3PO4 + 3 KOH —> K3PO4 + 3H2O
Which of the following is a Børnsted-Lowry base ?
HCO3-
Draw the condensed structure to cesium formate
HCOOC5
Write the reaction between formic acids and methyl alcohols
HCOOH + CH3OH —> HCOOCH3 + H2O
Which acid is produced in the stomach ?
HCl
Which of the following compounds is the conjugate base of H2SO4
HSO4-
A phospholipid
Has both polar and non polar regions
Orange juice is a
Heterogenous mixture
The only liquid metal is
Hg
What are the products of the decomposition of mercury (II) oxide ?
Hg and O2
Vodka is a
Homogeneous mixture
An unsaturated salt solution is a
Homogenous mixture
What is the first element of the periodic table ?
Hydrogen (H)
In the reaction described by the word equation: Sodium + water —> sodium hydroxide + hydrogen gas
Hydrogen gas is a product
Neutralization is the chemical process in which
Hydrogen ions react with hydroxide ions to form water
Name the process that converts oils to fats
Hydrogenation
Name the process that converts unsaturated fatty acids to saturated fatty acids
Hydrogenation
What is the term for a water molecule that gains an extra hydrogen ion?
Hydronium ion
What is the correct name of the ion OH- ?
Hydroxide
An oxidation number of the metal in a molecule of Li2SO4 is
I
Gasoline and water are
Immiscible
Aqueous means
In water solution
Alkenes are ... in water
Insoluble
Ethane is ... in water
Insoluble
An atom or group of atoms that have a net positive or negative charge is a(n)
Ion
A bond between metal and non metal is generally
Ionic
Identify the bond formed between the sodium and iodine
Ionic
The energy rot required to remove an electron from an atom is known as
Ionization energy
Strong acids
Ionize completely and produce many hydrogen ions in solution
Potassium ions loose one electron when they react. Write the symbol of the ion that result
K+
Identify the salt in the following reaction: KOH (aq) + HBr (aq) —> H2O (l) + KBr (aq)
KBr
Which equation below violates the law of conservation of mass ?
KCl + Br2 -> KBr + Cl2
Write the formula for potassium permanganate
KMnO4
Fructose is a(n)
Ketose
What scientist is a famous for his equilibrium principle ?
Le Chatelier
Give the corresponding name to the symbol Pb
Lead
Which of these compounds is a base ?
LiOH
Give the name of two unsaturated fatty acids
Linolenic acid and oleic acids
A ... is a rage non polar biological molecule
Lipid
Plant fats are ... at room temperature
Liquid
Acids have a pH that is
Lower than 7
Catalysts increase the rate of a chemical reaction by means of
Lowering activation energy
Maltose is
Malt sugar
What is the only metal that is in liquid form at room temperature ?
Mercury
Bonds between atoms of metal are generally
Metallic
The main component of natural gas is
Methane
Which of these processes is an example of a chemical change ?
Methane is burned in air
Which of the following alkenes does NOT exist ?
Methene
The products of the reaction between methanol and ethanoic acid are
Methyl ethanoate and water
Identify the redox reaction A) Mg + 2 HCl —> MgCl2 + H2 B) KOH + HNO3 —> KNO3 + H3O C) Pb(NO3)2 + 2 HBr —> PbBr2 + 2 HNO3 D) Ca(OH)2 + 2 HCl —> 2 H2O + CaCl2
Mg + 2 HCl —> MgCl2 + H2
Which of the following compounds is not a salt ?
Mg(OH)2
Magnesium atoms loose two electrons when they react. The symbol for the ion that result in
Mg+
Which of the following formulas is the correct one for magnesium sulphate ?
MgSO4
Sucrose is not
Milk sugar
Isomers share the same
Molar mass
To determine the molarity of an HCl solution, you need to know the number of
Moles of HCl in 1 L of solution
Which of the following quantum numbers describes a «p» orbital in the third energy level ?
N = 4, l =3, m = 0
What is the chemical formula for sodium carbonate ?
Na2CO3
Identify table salt
NaCl
Anions have ... charge and are ... than the atoms from which they are formed
Negative/larger
An anion is a ... charged ion
Negatively
Which of the following is a noble gas?
Neon
The charge of a neutron is
Neutral
When 10 ml of 1 mol*dm-3 HCl is added to 10 ml of 1 mol*dm-3 NaOH, the resulting solution is
Neutral
Give the name to the functional group -NO2
Nitro
Which of the diatomic element has a triple bond between its atoms ?
Nitrogen
What is the main gas found in the air we breathe ?
Nitrogen (78%)
A dissolved solute that does not form ions is
Non electrolyte
Ethylene is a ... molecue
Non-polar
Vinegar and oil form A) a homogenous mixture B) a chemical change C) a compound D) None of the previous answers
None of the previous answers
The general electron configuration for all elements in group 15 (V.A) is
Ns2, np3
A pentose sugar is a part of a monomer used to build one of the following macromolecules?
Nucleic acids
All elements in group 1 have the same
Number of electrons in the outermost electron shell
What is the formula for the ion formed when oxygen atom 8O obtains a noble gas configuration ?
O2-
Oils do not dissolve in water because
Oils are non-polar and water is polar
Maltose is
Oligosaccharide
How many protons per molecule can a monophonic acid donate ?
One
What is true in regard to single-displacement reactions ?
One element replaces another in an compound
The common name for the following compound HOOC - COOH is
Oxalic acid
The conversion of ethanol to ethanoic acid is an example of
Oxidation
Which process represents a chemical change ?
Oxidation
Which of the diatomic element does not have a single bond between its atoms ?
Oxygen
Which of the diatomic element has a double bond between its atoms ?
Oxygen
Amino acids in proteins are linked by
Peptide bonds
What is the correct name for an aqueous solution of HClO4?
Perchloric acid
A horizontal row of elements on the periodic table is known as a(n)
Period of series
If -OH group is attached to benzene ring than the formed compound is a(n) ?
Phenol
A ... is a triglyceride that has fatty acid which has been replaced by a polar phosphate group
Phospholipid
Lecithin is a
Phospholipids
Which name/formula combination is incorrect ?
Phosphorous acid/H3PO4
The melting of ice is a
Physical change
What type of chemical bond holds the atoms together within a warmer molecule ?
Polar covalent bond
Glycogen is
Polysaccharide
Cations have a ... charge and are ... than the atoms from which they are formed
Positive/smaller
For which element stays the chemical compound K?
Potassium
The substance that is the result of. CHEMICal reaction is called a
Product
Give the name to the product of dehydrogenation of propane
Propene
What type of organic molecule consists of long chain of amino acids ?
Protein
Which of the following particle has a positive charge ? - proton - neutron - anion - electron
Proton
According to the Brønsted-Lowry theory, a base is a
Proton acceptor
According to the Brønsted-Lowry theory, an acid is a
Proton donor
Except for in the simplest type of hydrogen atom, all nuclei consist of
Protons and neutrons
The atoms has Z = 27 and A = 60. How many protons and electrons are in this atom ?
Protons: 27 Electrons: 27
General formula of primary amine is
R-NH2
Identify the amine
R-NH2
The substance that enters a chemical reaction is called a
Reactant
What is the name given to the substances that are initially involved in a chemical reaction ?
Reactants
Hygroscopic means
Readily absorbs water
The following reaction can be classified as a CH3Br + NaOH —> CH3OH + NaBr
Rearrangement
In a solution of salt and water, the solute is
Salt
Spans are products of
Saponification
What product would you expect from reduction of ketosis ?
Secondary alochol
Heptane has
Seven carbon atoms
The momentum quantum number (l) of an orbital indicates the ... of the orbital
Shape
Saturated fatty acids have ..... covalent bonds
Single
A solution with a pH of 6 is considered to be
Slightly acidic
Select the correct formula for tin(IV) oxide
SnO2
Name the compound NaNO2
Sodium nitrite
Sublimation involvert a change from
Solid to a gas
Chemical bonds may be produces by any of the following processes involving electrons except
Splitting electrons
What is the formula for the ion when the strontium 38Sr loses its valence electrons ?
Sr2+
The polysaccharide that's totes energy in plants is called
Starch
Which of the both polymers occur naturally ?
Starch and cellulose
Formula that shows arrangement of atoms is a compound called
Structural formula
Give the common name for the following compound HOOC-CH2-CH2-COOH
Succinic acid
Another name for table sugar is
Sucrose
Identify common table sugar
Sucrose
Identify non-reducing sugar
Sucrose
Which of the following compounds is not a monosaccharide ?
Sucrose
What is the correct name for ion SO4^2- ?
Sulfate
In which type of reaction do two or more compounds retract to form one product?
Synthesis
All of the following are heterogeneous mixtures except
Tap water
«no two electrons in the same atom can have the same 4 quantum numbers» - it is a statement of
The Pauli exclusion principle
The atomic number of an element is equal to
The number of electrons in the atom
Which of the following formulations indicate that the chemical equation is balanced ?
The numbers of atoms of each element are the same on both sides of the equation
Which of these does the angular momentum quantum number indicate ? A) the shape of an orbital B) the main energy level of an electron C) the orientation of an orbital around the nucleus D) the spin state of an electron in an orbital
The shape of an orbital
Solid, liquid and gas are
The three common states of matter on earth
Which therm does NOT describe fatty acid ? A) saturated B) monounsaturated C) polyunsaturated D) they are all used
They are all used
Which is NOT true for «p» orbitals ?
They are found in all energy levels
Give the name to the functional group -SH
Thiol
Give the name of arbitrary hydroxy amino acid
Threonine/serine
In ionic bonds, valence electrons are
Transferred
When 3 fatty acids are bonded to glycerol backbone through ester bonds, a ... is formed
Triglyceride
True or false ? Acids have a pH level below 7
True
Ethers are formed by the attachment of
Two alkyl groups to same oxygen atom
A solution that contains a large concentration of solute but can hold even more solute is
Unsaturated and concentrated
Acetic acid is found in
Vinegar
What would be the mass percentage of a solution made by mixing of 150g of 10% HCl and 100g of 25% HCl?
W = 16%
250 g of 50% HNO3 were diluted with 150g of water. Calculate the mass percentage of diluted acid
W = 31,25%
50 g of substance A and 100 g of substance B were dissolved in 350 g of solvent. Calculate mass fraction of substances A and B in the prepared solution
Wa = 0,1 Wb = 0,2
In a solution of sugar and water, the solvent is the
Water
The solvent in a vinegar is
Water
When ethanol undergoes a reaction with acetic acid it produce and ester and a second compound. The name of this second is>
Water
Which of these is NOT a solution ?
Water
Which two substances are always or induced by a neutralization reaction ?
Water and salt
Combination of fatty acid with a long chain alcohol produces
Wax
HCl is a strong acid. When it combines with water, the conjugate of HCl will be a
Weak base
Anhydrous does mean
Without water
Which of the following is written incorrectly ? A) liquid water + energy —> water vapour B) water vapor —> liquid water + energy C) ice + energy —> liquid water D) liquid water + energy —> ice
liquid water + energy —> ice
Which of the following sets of quantum numbers is not possible ?
n=4, l=4, m= +2, s= -1/2
Which of the solutions is the most basic ?
pH = 12,0
What is the pH of a solution whose pOH is 10.0?
pH = 4
The concentration of H in coffee is 1*10^-5 mol/l. What pH is this?
pH = 5
What is the pH of a 0,0001 mol*dm-3 NaOH solution ?
pH=10
Calculate the pOH of 0.01 mol*dm-3 HNO3 solution
pOH = 12
Which of the solutions is the most acidic ?
pOH = 12
Which are the sublevels in an energy level of n=3?
s, p, d
Animal fats are ____ at room temperature
solid
Name the three states of matter
solid, liquid, gas
Hydrogen chloride can be made from the reaction of chlorine and hydrogen Cl2(g) + H2(g) —> 2 HCl(g) H= - 440 KJ*mol-1
the reaction is exothermic
