Chemistry Random Retrieval Y12

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Chemistry Year 12 Random Retrieval

This quiz contains all the questions in the year 12 chemistry section. The website will pick 10 questions at random.

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Choose one of the following options:

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An example of a p-block element is:

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In the periodic table the elements are arranged in order of:

(i) atomic number

(ii) mass number

(iii) number of protons in the nucleus

(iv) number of protons and neutrons in the nucleus.

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Which of these ions has the greatest polarising power?

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Which of these systems is NOT in a state of dynamic equilibrium?

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What is the electronic configuration of bromine? Enter your answer in the following format 1s2 2s2 etc. (note the space between each sub-shell!) Follow the aufbau order of sub-shell filling.

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An ammonia molecule, NH3, can react to form an ammonium ion, NH4+. When this happens:

(i) the ammonia molecule forms a bond with a proton

(ii) the ion formed has a tetrahedral shape

(iii) a dative covalent bond forms

(iv) the H-N-H bond angle is 90o

9 / 10

Which of these true statements can help to explain why iodine is a solid while chlorine is a gas at room temperature and pressure?

(i) iodine molecules have a larger surface area than chlorine molecules

(ii) iodine atoms are heavier than chlorine atoms

(iii) the outer shell electrons in iodine atoms are further from the nucleus than they are in chlorine atoms

(iv) the charge on the nucleus of an iodine atom is larger than the charge on the nucleus of a chlorine atom

10 / 10

Which of these statements is true of a metallic crystal?

(i) It consists of atoms strongly held together by metallic bonding.

(ii) It consists of a regular array of positive ions in a sea of negative electrons.

(iii) The crystal is held together by the attraction between positive metal ions and electrons.

(iv) The crystal is negatively charged.

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20

Foundations in Chemistry Random Retrieval

This quiz contains all the questions in the Foundations in Chemistry section. The website will pick 10 questions at random.

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Which of these elements has a relatively low boiling point (below 500 oC)?

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Which of these sets of properties is that of a group 1 metal?

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Which of these materials owe their strength to intermolecular forces?

 

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What is the bond angle found in ammonia?

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A molecule of sulfur hexafluoride, SF6 is:

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Which of these compounds consist of molecules which are linear?

(i) water

(ii) beryllium chloride

(iii) sulfur dioxide

(iv) carbon dioxide

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8 / 10

Calculate the theoretical yield of ethyl ethanoate, CH3CO2C2H5, when 6.9 g ethanol, C2H5OH, reacts with excess ethanoic acid, CH3CO2H.

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What is the molecular formula of a hydrocarbon which consists of 82.8% carbon and has a relative molecular mass estimated in the range 50 and 60.

10 / 10

How many electrons are there in an oxide ion?

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8

Period Table & Energy Random Retrieval

This quiz contains all the questions in the Period Table & Energy section. The website will pick 10 questions at random.

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This is the equilibrium in a solution of bromine in water:

Br2(aq) + H2O(l) <=> HOBr(aq) + H+(aq) + Br-(aq)

The orange colour of bromine disappears on adding

(i) sodium bromide

(ii) water

(iii) dilute hydrochloric acid

(iv) sodium hydroxide solution

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When iron(II) chloride solution mixes with silver nitrate solution some silver metal precipitates and the mixture reaches an equilibrium state.

Fe2+(aq) + Ag+(aq) <=> Fe3+(aq) + Ag(s)

When the aqueous layer is decanted off, the precipitate of silver redissolves on adding a solution of:

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Which of these systems is NOT in a state of dynamic equilibrium?

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The energy needed to atomise 1 mol of gaseous ethene, C2H4 is 2087 kJ mol-1. Calculate the average bond enthalpy for a C-H bond given that the bond enthalpy for the C=C bond is +347 kJ mol-1.

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For which of the following equations is the value for standard enthalpy change equal to the standard enthalpy of formation of sodium chloride?

6 / 10

An example of an endothermic change is the:

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Which of the following properties increase from left to right across the series: AgCl - AgBr - AgI?

(i) intensity of colour

(ii) solubility in ammonia solution

(iii) ease of oxidation to the halogens

(iv) solubility in aqueous ammonia

8 / 10

Iodine oxidises thiosulfate ions, S2O32 -, to S4O62- . What is the oxidation number (O.N.) change for each sulfur atom?

9 / 10

What is the oxidation number of NITROGEN in

NH4+

10 / 10

In the periodic table the elements are arranged in order of:

(i) atomic number

(ii) mass number

(iii) number of protons in the nucleus

(iv) number of protons and neutrons in the nucleus.

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20

Core Organic Chemistry Random Retrieval

This quiz contains all the questions in the Core Organic Chemistry section. The website will pick 10 questions at random.

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Choose one of the following options:

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Infra-red absorption ranges for some bonds are as follows:

C-H, 2850 - 3300 cm-1

C=C, 1620 - 1680 cm-1

C=O, 1680 - 1750 cm-1

C-O, 1000 - 1300 cm-1

O-H (alcohols), 3230 - 3550 cm-1

O-H (acids), 2500 - 3000 cm-1

The IR spectrum of propanal has one particularly strong absorption peak

This can be expected to be at:

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Species such as CH3+ and Br+ can be detected in a mass spectrum but do not occur in chemical reactions under typical laboratory conditions.

This is because in a mass spectrometer:

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This procedure produces a white precipitate which dissolves easily in dilute ammonia solution: heating C4H9X for a few minutes with aqueous alkali, then acidifying the mixture with dilute nitric acid and adding silver nitrate. This shows that X is:

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Three halogenoalkanes differ in the rate with which they react with aqueous sodium hydroxide. The order of the rates of reaction is:

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What is the name of the mechanism of the reaction between 1-bromobutane and aqueous sodium hydroxide?

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What is the main product of the reaction of 1,2-dichloroethane with a solution of ammonia in ethanol? (Under these conditions ammonia acts as a nucleophile)

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Adding a compound X, C4H10O, drop by drop to a hot acidic solution of potassium dichromate(VI) and allowing the product to distil off as it forms, produces a compound which gives a silver mirror with Tollens solution. This shows that X could be:

(i) CH3CH2CH2CH2OH

(ii)CH3CH2CHOHCH3

(iii)CH3CH(CH3)CH2OH

(iv) CH3CH2OCH2CH3

10 / 10

At a high temperature in the presence of steam, the alkane C16H24 reacts to form a mixture of ethene, propene and ethane. This is an example of:

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