Is this reaction endothermic or exothermic?

2Na2O2(s) + 2H2O(l) → 4NaOH(s) + O2(g) + 126 kJ

a. they are both space stations

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.