The Group 14 elements show a change from non-metallic to metallic character down the group. Silicon readily reacts with elements of high electronegativity. (i) Write an equation for the formation of $$$\mathrm{SiCl}_{4}$$$ from its constituent elements. ................................................................................................................................. (ii) Describe what is observed when a small sample of $$$\mathrm{SiCl}_{4}$$$ is added to water. ....................................................................................................................................... . ................................................................................................................................. (iii) $$$\mathrm{SiO}_{2}$$$ is a white solid that melts above $$$1700^{\circ} \mathrm{C}$$$. $$$\mathrm{SiCl}_{4}$$$ is a colourless liquid at room temperature. Explain the difference in the melting points of these two compounds with reference to their structure and bonding. ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . ....................................................................................................................................... . .................................................................................................................................

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_w24_qp_23 Year：2024 Question No：3(e)

Answer:

Knowledge points:

12.1.1 explain the lack of reactivity of nitrogen, with reference to triple bond strength and lack of polarity

12.1.2.1 the basicity of ammonia, using the Brønsted–Lowry theory

12.1.2.2 the structure of the ammonium ion and its formation by an acid–base reaction

12.1.2.3 the displacement of ammonia from ammonium salts by an acid–base reaction

12.1.3 state and explain the natural and man-made occurrences of oxides of nitrogen and their catalytic removal from the exhaust gases of internal combustion engines

12.1.4 understand that atmospheric oxides of nitrogen (NO) can react with unburned hydrocarbons to form peroxyacetyl nitrate, PAN, which is a component of photochemical smog

12.1.5 describe the role of NO in the formation of acid rain both directly and in their catalytic role in the oxidation of atmospheric sulfur dioxide

Answer:

Knowledge points:

Solution:

Related Question