This question is about silicon and carbon.
Silicon is a semiconductor.
Data obtained using the mass spectrum of silicon are shown.
Isotope mass number | Relative abundance |
28 | 92.17 |
29 | 4.71 |
30 | 3.12 |
Calculate the relative atomic mass of silicon to two decimal places.
(2)
(1)
Isotope | Number of protons | Number of neutrons |
28Si | ||
29Si | ||
30Si |
(1)
Silicon dioxide, SiO2 , is the main constituent of sand and has a giant lattice structure similar to that of diamond.
Crystalline silicon dioxide is used on the surface of semiconductor devices to provide a heat-resistant, electrically insulating layer.
Explain how the structure and bonding of silicon dioxide make it useful for this application.
Calcium silicate is formed in the removal of silicon dioxide impurities in the extraction of iron from its ores. A sample of calcium silicate composed of calcium, silicon and oxygen was found to contain 12.0 g of calcium, 8.43 g of silicon and 14.47 g of oxygen.
Determine the empirical formula of calcium silicate.
You must show your working.
Carbon dioxide is a gas at room temperature. A fizzy drink is canned at 5.0°C and 1.3 × 105 Pa and contains approximately 3 g of carbon dioxide.
Calculate the volume, in cm3, occupied by 3.00 g of carbon dioxide gas at 5.0°C and 1.3 × 105 Pa.
[pV = nRT R = 8.31 Jmol−1K−1]
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