Podcast
Questions and Answers
What is a key distinction between relative isotopic mass and relative molecular mass?
What is a key distinction between relative isotopic mass and relative molecular mass?
- Relative isotopic mass applies to molecules, while relative molecular mass applies to individual isotopes.
- Relative isotopic mass includes the mass of electrons, while relative molecular mass does not.
- Relative isotopic mass refers to the mass of a specific isotope, while relative molecular mass refers to the mass of a molecule. (correct)
- Relative isotopic mass is always a whole number, while relative molecular mass is always a decimal.
Considering the reaction $6SrO + 2Al \rightarrow 3Sr + Sr_3Al_2O_6$, what relationship is essential to determine the maximum mass of strontium produced from 100g of strontium oxide?
Considering the reaction $6SrO + 2Al \rightarrow 3Sr + Sr_3Al_2O_6$, what relationship is essential to determine the maximum mass of strontium produced from 100g of strontium oxide?
- The pressure at which the reaction occurs.
- The density of strontium metal.
- The volume of aluminium used.
- The molar mass ratio between SrO and Sr. (correct)
In the nuclear reaction where $^{32}S$ transforms into $^{32}P$ and emits a proton, what other particle is required?
In the nuclear reaction where $^{32}S$ transforms into $^{32}P$ and emits a proton, what other particle is required?
- A deuteron, $^2H^+$
- A neutron (correct)
- A proton
- An electron
Which substance relies exclusively on temporary dipole intermolecular forces in its liquid state?
Which substance relies exclusively on temporary dipole intermolecular forces in its liquid state?
What accounts for copper's high melting point?
What accounts for copper's high melting point?
Under what circumstances would the standard enthalpy change of combustion of graphite be closest in numerical value to the standard enthalpy change of formation?
Under what circumstances would the standard enthalpy change of combustion of graphite be closest in numerical value to the standard enthalpy change of formation?
Given the energy cycle for the reaction $Br_2(l) + 3F_2(g) \rightarrow 2BrF_3(l)$ and its related enthalpy changes, how would you calculate the average bond energy of the Br-F bond in $BrF_3$?
Given the energy cycle for the reaction $Br_2(l) + 3F_2(g) \rightarrow 2BrF_3(l)$ and its related enthalpy changes, how would you calculate the average bond energy of the Br-F bond in $BrF_3$?
In which reaction does the oxidation number of sulfur undergo the greatest change?
In which reaction does the oxidation number of sulfur undergo the greatest change?
In the reaction $2TiO_2 + 4Cl_2 + 3C \rightarrow 2TiCl_4 + 2CO + CO_2$, what substance is reduced?
In the reaction $2TiO_2 + 4Cl_2 + 3C \rightarrow 2TiCl_4 + 2CO + CO_2$, what substance is reduced?
Sulfuric acid dissociates in aqueous solution, first completely ($H_2SO_4 \rightarrow HSO_4^- + H^+$) and then partially ($HSO_4^- \rightleftharpoons SO_4^{2-} + H^+$). How would you determine $K_c$ if you know the initial concentration of $H_2SO_4$ and the $HSO_4^-$ concentration?
Sulfuric acid dissociates in aqueous solution, first completely ($H_2SO_4 \rightarrow HSO_4^- + H^+$) and then partially ($HSO_4^- \rightleftharpoons SO_4^{2-} + H^+$). How would you determine $K_c$ if you know the initial concentration of $H_2SO_4$ and the $HSO_4^-$ concentration?
What graphical pattern is characteristic of an autocatalytic reaction, where a product catalyzes its own formation?
What graphical pattern is characteristic of an autocatalytic reaction, where a product catalyzes its own formation?
Elements X and Y are in Period 3. X forms a soluble acidic oxide with an oxidation number of +4, and Y forms an amphoteric oxide. What is a plausible formula for the compound formed between X and Y?
Elements X and Y are in Period 3. X forms a soluble acidic oxide with an oxidation number of +4, and Y forms an amphoteric oxide. What is a plausible formula for the compound formed between X and Y?
In Group 2, three statements about metal Q are correct, and one about metal R. If R has a lower pH value, smaller atomic radius and reacts slower with cold water then what is a true statement for R?
In Group 2, three statements about metal Q are correct, and one about metal R. If R has a lower pH value, smaller atomic radius and reacts slower with cold water then what is a true statement for R?
Given the electronic arrangements for four elements, which is the strongest oxidizing agent?
Given the electronic arrangements for four elements, which is the strongest oxidizing agent?
In a series of test-tube reactions, which combination will likely produce a white solid product?
In a series of test-tube reactions, which combination will likely produce a white solid product?
Under what conditions does concentrated sulfuric acid act both as a strong acid and an oxidizing agent?
Under what conditions does concentrated sulfuric acid act both as a strong acid and an oxidizing agent?
What influence does the hydrogen chloride molecule have on the nitrogen atom when ammonia ($NH_3$) reacts with hydrogen chloride (HCl) to generate ammonium chloride ($NH_4Cl$)?
What influence does the hydrogen chloride molecule have on the nitrogen atom when ammonia ($NH_3$) reacts with hydrogen chloride (HCl) to generate ammonium chloride ($NH_4Cl$)?
How do the decomposition temperature of Group 2 carbonates and the first ionization energy change as you descend from magnesium to barium?
How do the decomposition temperature of Group 2 carbonates and the first ionization energy change as you descend from magnesium to barium?
What is the primary immediate product of the reaction between sulfur dioxide ($SO_2$) and calcium hydroxide in aqueous solution?
What is the primary immediate product of the reaction between sulfur dioxide ($SO_2$) and calcium hydroxide in aqueous solution?
Flashcards
Temporary Dipoles
Temporary Dipoles
Forces between temporary dipoles due to momentary uneven electron distribution.
Autocatalytic Reaction
Autocatalytic Reaction
A reaction where one of the products acts as a catalyst, speeding up the reaction.
Reactions that Produce Water
Reactions that Produce Water
Reactions that give water as a product, such as esterification or alcohol dehydration.
HX reactions with alcohols
HX reactions with alcohols
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Alcohol + Carboxylic acid?
Alcohol + Carboxylic acid?
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Alcohol, Heat, and Al2O3
Alcohol, Heat, and Al2O3
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Metallic Bonding
Metallic Bonding
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First Ionization Energy
First Ionization Energy
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Study Notes
- This is a Chemistry Paper 1 Multiple Choice exam paper
- It is for Cambridge International AS & A Level students
- Exam code is 9701/11
- The exam is in October/November 2020
- The exam duration is 1 hour
- There are 40 questions
- Each correct answer scores one mark
- No marks are deducted for wrong answers
- Candidates need a multiple-choice answer sheet, soft clean eraser, soft pencil (type B or HB), and a data booklet
- Calculators are permitted
Key Chemistry Concepts and Questions
- Cl has a relative isotopic mass of 35.5
- Strontium metal can be extracted from strontium oxide (SrO) by reduction with aluminium
- A single 32P nucleus is produced when a single 32S nucleus joins with a neutron, emitting a proton in the process
- Bromine (in liquid form) has only intermolecular forces based on temporary dipoles between the particles
- Copper has a high melting point due to strong attractive forces between copper ions and delocalised electrons
- Combustion of graphite and formation of CO2(g) are numerically equal standard enthalpy changes
- The standard enthalpy of formation of BrF3(l) is -301 kJ mol-1
- The enthalpy change of BrF3(l) to BrF3(g) is +44 kJ mol-1
- S(s) + O2(g) → SO2(g) demonstrates the greatest change in oxidation number of sulfur
- Chlorine is reduced in the chloride process for titanium manufacture
- In aqueous solution, sulfuric acid dissociates in two stages, the first to completion and the second reaching equilibrium
- The rate of an autocatalytic reaction, when plotted against time, will show a curve that initially increases then decreases
- Silicon and Y formulates SiS2
- Barium is used in agriculture to reduce the acidity of soil
- 1s²2s²2p⁵ is the strongest oxidising agent
- Excess calcium (s) + water (I) produces a white, solid product
- Sodium bromide reacts with concentrated sulfuric acid both as a strong acid and as an oxidising agent
- The hydrogen atom from HCl donates a lone pair of electrons to the nitrogen atom
- As Group 2 is descended from magnesium to barium, the first ionisation energy decreases
- Sulfur dioxide, SO2, reacts with calcium hydroxide in aqueous solution to give CaSO3
- 2-methylbut-1-ene does not have geometrical isomers
- 2-methylbut-1-ene reacts with HBr in an addition reaction to give 1-bromo-2-methylbutane as the main product
- A gas is made which contributes to global warming during the complete combustion of PVC
- Iodoethane, CH3CH2I, reacts with aqueous silver nitrate at 50 °C through nucleophilic substitution
- The precipitate that forms during the reaction with Iodoethane, CH3CH2I is yellow
- The pH in test-tube X is 7
- The pH in test-tube Y is 2
- The pH in test-tube Z is 2
- Methanol, CH3OH, can be produced industrially by reacting CO with H2 with ∆H = -91 kJ mol-1
- CH3CH(CH3)CH(CH3)2 produced in a termination step during the bromination of propane
- The process can be carried out at 4 × 103 kPa and 1150K
- Sodium, Aluminium and sulfur are elements shown correctly
- The synthesis of 1-iodopropane, C3H7I, into butanoic acid, C3H7CO2H, by a two-stage chemical
- In the first stage, ethanolic potassium cyanide is reacted with 1-iodopropane
- Aqueous sulfuric acid, aqueous sodium hydroxide and sodium react with polymer X
- The molecular formula of compound X is C10H18O
- Sodium, Aluminium and sulfur are elements shown correctly
- N2O(g) to N2(g) and O2(g) is exothermic, the reaction between NO and oxygen is exothermic, the decomposition of
- If N2O(g) is oxidised by O2(g) to NO2(g), 16 kJ is released per mole of N2O
- Enthalpy of solution of HCl, enthalpy of combustion of H2 = enthalpy of formation of H2O, and enthalpy of hydration of H⁺ + enthalpy of hydration of Cl⁻
- A(aq) + B(aq) = C(s) + D(aq) has an equilibrium of mol⁻¹ dm³
- Its only infrared absorption between 2500 and 3000 cm¯¹ is sharp and strong
- Carvone is found in spearmint oil.
- The free radical CH3• is generated during the bromination of methane
- A student converts 1-iodopropane, C3H7I, into butanoic acid, C3H7CO2H, by a two-stage chemical synthesis.
- Its only infrared absorption between 2500 and 3000 cm¯¹ is sharp and strong.
- Aqueous sulfuric acid, aqueous sodium hydroxide and sodium react with polymer X.
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