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C2.4: Bonding, properties, energy changes, AS 91164

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Bond enthalpy practice questons Use the table of bond enthalpies for the questions below. Bond Mean bond enthalpy (kJ mol–1) Cl–Cl 243 Cl–H 431 H–H 435 C–H 414 O=O 502 O–H 464 N N 945 N–H 391 C–C 347 C–O 358 C=O 730 C-Cl 331 Calculate the enthalpy change for these reactio...

Bond enthalpies further practice

Enthalpy change practice questionsThe equation shows the combustion of butane C4H10 (g) + O2 (g) → 4CO2 (g) + 5H2O (g) When 100g of butane undergoes complete combustion 4960 KJ of energy is released.Calculate the enthalpy change when 1 mole of butane undergoes combustion. M(Butane) = 58.1 gmol⁻¹ 2. Fe₂O₃ + Al → Al₂O₃ + ...

Practice exam type questions on solids with answers1. Complete the table below Substance Type of solid Type of particle Attractive force between particles Ammonia, NH₃ Zinc, Zn Silicon Dioxide, SiO₂ 2. Complete the table below: Solid Type of solid Type of particle Bonding between particles Chlorine, ...

Chem 2.4 Worksheet #1.docpCHEMISTRY 2.4 _ Name: _ WORKSHEET ONE SIMPLE MOLECULES Molecule list: SO2 SO3 H2S CO2 H2O NH3 PH3 O3 CCl4 1. Name each of the substances in the molecule list above and draw their Lewis structures. Name or describe the shape of each molecule. Molecule Name Name of Shape ...

Lewis structures and shapes with answers1. Draw lewis structures for each of the following molecules CH₄ H₂O N₂ 2. Boron and phosphorous both bond with 3 fluorine atoms to form BF₃ and PF₃. However they have different shapes and bond angles, Draw lewis structures and explain why these molecules have different shapes. Incl...

Shapes_of_Molecules_PrepLXX Shapes of Molecules Prep For each of the following predict the shape and bond angles; AlCl3 ………………………………………….……………………………………………………………………………… H2S …………………………………….……………………………………………………………………………………… PH3 ...………………………………………………………………………………………………………………………… CS2 .……………………………………………………………………………………………………………...

Shapes_of_Molecules_Prep_AnswersLXX Shapes of Molecules Prep For each of the following predict the shape and bond angles; AlCl3 Trigonal Planar, 120° H2S Non-linear, 104.5° PH3 Pyramidal, 107° CS2 Linear, 180° SO2 Non-linear, 120° (10) Nitrogen and Boron can form chlorides NCl3 and BCl3 Draw ‘dot & cross’ diagrams to show...

Practice questions on shapes of molecules with answers1. Complete the table Molecule Methane Ammonia Water Number of sets of electrons around central atom Number of pairs of non-bonding electrons around central atom Shape of molecule 2. Describe the shape of each of the following molecules: H₂S CF₄ NF₃ CO₂ 3. Com...

Chem 2.4 Worksheet #2.docCHEMISTRY 2.4 _ Name: _ WORKSHEET TWO TYPES OF SOLIDS: COVALENT 1. In the following list of substances, circle the ones which consist of extended three dimensional arrays. Silica Carbon dioxide Polythene Iodine Diamond Ammonia 2. Discrete molecular substances e...

Chem 2.4 Answers #2.doc

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Chem 2.4 Worksheet #3.docCHEMISTRY 2.4 _ Name: _ WORKSHEET THREE TYPES OF SOLIDS: IONIC 1. Circle the substances in the following list which are ionic. CO ZnO Ar Diamond Ag Cu(NO3)2 PbI2 HCl(g) 2. Describe the nature of the binding forces present in an ionic sol...

Chem 2.4 Answers #3.doc

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Chem 2.4 Worksheet #5.docCHEMISTRY 2.4 _ Name: _ WORKSHEET FIVE BONDING CONTINUED 1. The oxides of the third period are shown below with their melting points. Substance formula Na2O MgO Al2O3 SiO2 P2O5 SO2 Cl2O Melting point (oC) 1275 2800 2050 1723 300 -75 -121 (a) Describe the obser...

Chem 2.4 Answers #5.doc

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NCEA Exams

AS91164: Bonding, structure, properties and energy changes. Collated exam questions

ncea exams - sample answers

AS91164: Bonding, structure, properties and energy changes. Collated exam questions sample answers

handouts / revision aids

Revision sheet: Shapes of some molecules, VSEPR, Polarity and IMFLewis Structures, VSEPR, Polarity, IMF 1. carbon tetrafluoride = CF4 Molecular shape = tetrahedral, bond angle = 104.5° (4 regions; no LP) Molecular polarity = NONPOLAR (symmetrical) IMF = London dispersion forces 2. BF3 Molecular shape = trigonal planar, bond angle = 120° (3 reg...

Further aides

Types of solids

Practicals

Types of solids

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