There are four unknown compounds that are labeled w, x, y, and z. only substance y is soluble in water. compound y could be
1)iron oxide.
2)zinc hydroxide.
3)potassium bromide.
4)silver oxide.

Potassium bromide

Explanation:

Potassium bromide is an ionic compound and it is freely soluble in water as water is polar solvent (with high dielectric constant) so can easily dissolve polar or ionic compounds in it.

"Like dissolved like"

for other compounds they are not soluble in water,

Zinc hydroxide is slightly soluble in water, but very less soluble as compared to potassium bromide.

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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it would be d. henry moseley

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