Equation Show Ing Dodecane Free Sea Of

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State the name of the process used to obtain paraffin from this substance Crude oil OR petroleum Fractional distillation fractionation Write an equation for the incomplete combustion of dodecane to produce gaseous products only. C12H26 12.5O2 12CO 13H2O Oxides of nitrogen are also produced during the combustion of paraffin in air.

Argon Ar Large(st) number of protons large(st) nuclear charge Same amount of shielding same number of shells same number of energy levels Suggest the element in Period 3 that has the highest electronegativity value.

Chlorine Cl Name the shape of CCl2 Bent v shape Write an equation to show the formation of one mole of ClF3 from its elements 0.5Cl2 1.5F2 ClF3 Tellurium is the element with atomic number of 52 Using information from the Periodic Table, complete the electron configuration of tellurium.

Kr 5s2 4d10 5p4 Suggest what might cause the relative atomic mass of the sample from a mass spectrometer to be different from the relative atomic mass given in the Periodic Table.

Other isotopes presentsome isotopes absent different abundances of isotopes Write an equation for the reaction that occurs when a tellurium ion hits the detector.

Te e(-) Te Predict whether the atomic radius of 124Te is larger than, smaller than or the same as the atomic radius of 130Te Explain your answer.

Same (Each isotope has the) same number of protonssame nuclear charge and same number of electrons electronic configuration Silicon dioxide (SiO2) has a crystal structure similar to diamond.

Macromolecular giant covalent giant molecule Suggest why silicon dioxide does not conduct electricity when molten.

SiO2 6HF H2SiF6 2H2O A sample of hydrated nickel sulfate (NiSO4.xH2O) with a mass of 2.287 g was heated to remove all water of crystallisation.

The solid remaining had a mass of 1.344 g.

Calculate the value of the integer x.

Show your working.

M1) NiSO4 H2O 1.344 (M2) 0.943 (M3) 154.8 18 (8.68 10-3 0.052) 1 6 or x 6 (M4) Suggest how a student doing this experiment could check that all the water had been removed.

State the strongest type of interaction that occurs between molecules of hydrogen peroxide and water.

Saturated - single bonds only no double bonds Hydrocarbon - contains carbon and hydrogen (atoms) only If the boiler for a central heating system is faulty, a poisonous gas may be produced during the combustion of C16H34 Write an equation for the reaction that forms this poisonous gas and one other product only C16H34 16.5O2 16CO 17H2O Explain why the sulfur compounds found in crude oil should be removed from the fractions before they are used for central heating fuel.

On combustion) SO2 produced Which causes acid rain A hydrocarbon C16H34 can be cracked to form C8H18, ethene and propene.

Write an equation to show this cracking reaction C16H34 C8H18 C2H4 2C3H6 Suggest one important substance manufactured on a large scale from propene.

M1 550 10095 579 g would be 100 mass M2 So 57965 8.91 moles NaN3 Then M3 Moles NaNH2 8.91 2 ( 17.8(2) moles) M4 mass NaNH2 17.8(2) 39 M5 693 or 694 or 695 (g) If a car is involved in a serious collision, the sodium azide decomposes to form sodium and nitrogen as shown in the equation.

NaN3(s) 2Na(s) 3N2(g) The nitrogen produced then inflates the airbag to a volume of 7.50 10-2 m3 at a pressure of 150 kPa and temperature of 35 C.

Calculate the minimum mass of sodium azide that must decompose.

The gas constant R 8.31 J K-1 mol-1) M1 308 K and 150 000 Pa M2 n PV or (150 000 7.5 10-2)( 8.31 308) M3 4.4(0) or 4.395 moles N2 M4 Moles NaN3 4.395 23 ( 2.93) M5 Mass NaN3 (2.93) 65 M6 191 g Sodium azide is toxic.

It can be destroyed by reaction with an acidified solution of nitrous acid (HNO2) as shown in the equation.: NaN3 2HNO2 2HCl 3N2 2NO 2NaCl 2H2O A 500 cm3 volume of the nitrous acid solution was used to destroy completely 150 g of the sodium azide.

State, in terms of fundamental particles, why the isotopes 10B and 11B have similar chemical reactions.

Electron being removed from a positive ion (therefore need more energy) electron being removed is closer to the nucleus Explain, in terms of its structure and bonding, why nickel has a high melting point.

Equation Show Ing Dodecane Free Sea Of

Contains positive (metal) ions or protons or nuclei and delocalised mobile free sea of electrons Strong attraction between them or strong metallic bonds Explain why nickel is ductile (can be stretched into wires).

Layers planes sheets of atoms or ions can slide over one another Layers planes sheets of atoms or ions can slide over one another 1s2 2s2 2p6 3s2 3p6 3d8 (4s0 ) Name the strongest attractive force between two ammonia molecules.

Hydrogen bonds H bonds Give the meaning of the term electronegativity.

The power of an atom or nucleus to withdraw or attract electrons or electron density or a pair of electrons (towards itself) in a covalent bond Give the name of the substance from which paraffin is obtained.

C12H26 12.5O2 12CO 13H2O Oxides of nitrogen are also produced during the combustion of paraffin in air.

Equation Show Cracking Dodecane