2.6. Giant covalent structures
A subsection of Chemistry, 5070, through 2. Atoms, elements and compounds
Listing 10 of 42 questions
Silicon is an element in Group IV of the Periodic Table. One of the isotopes of silicon is: 14Si Deduce the number of electrons, neutrons and protons in one atom of this isotope of silicon. number of electrons number of neutrons number of protons Silicon reacts with nitrogen when heated to produce silicon nitride, Si3N4. Construct the equation for this reaction. The structure of silicon dioxide is shown. silicon atom oxygen atom Describe two similarities in the structures of silicon dioxide and diamond. Explain why silicon dioxide has a high melting point. The structure of a compound of silicon is shown. O H H H H H H H C C O Si H C H C H H H Deduce the molecular formula of this compound. Draw a ‘dot-and-cross’ diagram for a silicon(chloride molecule, SiCl 4. Only include the outer shell electrons.
5070_w19_qp_21
THEORY
2019
Paper 2, Variant 1
View
This question is about elements in Group IV of the Periodic Table. The table shows some properties of the Group IV elements. element density at room temperature in g / cm3 melting point in °C boiling point in °C carbon 3550 silicon 2.34 germanium 5.35 tin lead 11.34 Predict the density of tin. Describe the general trend in the boiling points of the Group IV elements. Predict the state of silicon at 1600 °C. Give a reason for your answer. The structure of two compounds of silicon, P and Q, are shown. oxygen atom silicon atom chlorine atom P Q Explain in terms of structure and bonding why compound P has a high melting point and compound Q has a low melting point. compound P compound Q Draw a dot-and-cross diagram for a molecule of compound Q. Show only the outer shell electrons. A compound of carbon, hydrogen and silicon has the formula Si(CH3)4. Calculate the percentage by mass of carbon in this compound.
5070_w21_qp_21
THEORY
2021
Paper 2, Variant 1
View
Questions Discovered
42