<span>A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds; or through the sharing of electrons as in covalent bonds. The strength of chemical bonds varies considerably; there are "strong bonds" or "primary bond" such as metallic, covalent or ionic bonds and "weak bonds" or "secondary bond" such as Dipole-dipole interaction, the London dispersion force and hydrogen bonding.</span>
The awnser would be (C.) As it is the only correct one.
Physical change because it's only changing the shape of the gold.
Volcano you make the volcano with baking soda and vinegera
6 mph
It takes him 2 hours to bike 12 miles
12 miles / 2 hours = 6 mph
His speed is 6 mph