Zadania z chemii IB SL

A white crystalline solid has the properties shown in the table. Property Observation Melting point 770 °C Electrical conductivity of the solid none Electrical conductivity when molten good Solubility in water soluble Which structure is consistent with these…

(i) State the electron configuration of a nitrogen atom. (ii) Draw the Lewis formula of ammonia. (iii) Deduce the electron domain geometry and the molecular geometry of the ammonia molecule. (iv) Explain why the ammonia molecule is polar.

Nitrogen dioxide reacts with rain water and oxygen to form nitric acid. (i) State an equation for this reaction, including state symbols. (ii) Explain, with reference to the oxidation states of two elements, why this is a redox reaction. (iii) Describe the…

Nitric acid can form hydrogen bonds with water. Annotate the structures below to show the formation of a hydrogen bond between a molecule of nitric acid and a molecule of water. Use a dotted line to represent the hydrogen bond.

Discuss the melting points in the table below in terms of the bonding and/or intermolecular forces present in each substance. Substance Melting point / K Silicon dioxide (quartz) 1986 Poly(propene) 433

Four allotropes of carbon, labelled W, X, Y and Z, are described in the table. Allotrope Description W a single flat sheet of hexagonal rings, one atom thick, in which each carbon atom is bonded to three others X a closed cage of 60 atoms made of pentagonal…

A paper chromatogram is shown. The distances marked were measured along the paper. What is the retardation factor, $R_F$, of compound Y? A. 0.40 B. 0.60 C. 0.70 D. 1.67

Hydrogen fluoride boils at 20 °C, whereas hydrogen chloride boils at −85 °C. Which type of intermolecular force accounts for the much higher boiling point of hydrogen fluoride? A. Hydrogen bonding B. Dipole-dipole forces C. London (dispersion) forces D.…

(i) State the equation for the formation of glucose by photosynthesis. (ii) Outline two advantages of using biobutanol rather than petrol (gasoline) as a fuel for vehicles.