Match the description to the correct term. If the description matches both terms, use "both" for your answer.

Cause(s) the temperature of
the surroundings to
decrease.

Cause(s) a change in the
temperature of the
surroundings.

Cracking open a cold-pack.
Burning Wood

Absorb(s) energy from the
surroundings.

Cause(s) the temperature of
the surroundings to increase.

Release(s) energy to the
surroundings.

1. Endothermic reaction
2. Exothermic reaction
3. Both

Cause(s) the temperature of the surroundings to decrease. - 1. Endothermic reaction.

Cause(s) a change in the temperature of the surroundings. - 3. Both.

Cracking open a cold-pack. - 1. Endothermic reaction.

Burning Wood. - 2. Exothermic reaction.

Absorb(s) energy from the surroundings. - 1. Endothermic reaction.

Cause(s) the temperature of the surroundings to increase. - 2. Exothermic reaction.

Release(s) energy to the surroundings. - 2. Exothermic reaction.

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer