We can tell when a chemical reaction occurs by looking at the result. If the matter changes identity rather
than just form, then a (4). has occurred. When
this happens (5) are broken and formed. If a
substance's size, shape, or form changes then a
(6) has occurred. This happens when a change
in (7).
has happened, and the substance changes
between solid, liquid, and/or gas. This all falls under
the study of matter and how substances interact with
each other, or (8)

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

you didnt put any of the following