Question

silica, the primary component of sand and quartz, combines si + o₂ -> sio₂ (sio₂). 1. which type of matter (icm) is silica (sio₂)? 2. which type of matter (icm) is sand? 3. which pt group is silicon a member of? 4. how does its group react & why? 5. draw the atomic structure (model) of silicon. use numbers

Explanation:

1. Sand is a heterogeneous mixture as it contains various components like silica and other minerals in different proportions and phases.
2. Silicon is a member of Group 14 (IVA) in the periodic table.
3. The elements in Group 14 have 4 valence electrons. They can form covalent bonds by sharing these electrons. For example, silicon can form four - covalent bonds with other atoms.
4. The atomic structure of silicon has 14 protons, 14 neutrons (in the most common isotope), and 14 electrons. The electron configuration is 2, 8, 4 with the outermost 4 electrons being the valence electrons.

Answer:

1. Heterogeneous mixture
2. Group 14 (IVA)
3. Elements in Group 14 have 4 valence electrons and form covalent bonds by sharing them.
4. 14 protons, 14 neutrons (common isotope), 14 electrons; electron - configuration 2, 8, 4.