What type of reaction occurs without the addition of heat?

A

Explanation:

A spontaneous reaction doesn't require any addition of heat.

The rest of the choices require a transfer of heat energy.

its A. A spontaneous reaction

Explanation:

because they can occur without the addition of energy.

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explanation:

covalent bonds

consist of pairs of electrons shared by two atoms, and bind the atoms to fixed orientation and requre high energies to break them

ionic bonds

when two atoms differ considerably in their electronegativity, then one of the atoms will lose its electron to the other atom. this results in a positively charged ion(cation) and a negatively charged ion (anion)

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.