Substances are given: sulfur oxide (6), copper, calcium oxide, water.

Substances are given: sulfur oxide (6), copper, calcium oxide, water. Which of these substances will interact with each other? Write down the reaction equations and indicate the names of the resulting substances.

Let’s write down the chemical formulas of each substance from the task condition:
copper – Cu
calcium oxide – CaO
sulfur oxide (6) – SO3
water – H2O
Let’s write down the reaction of interaction from the names of the reaction products:
1) Calcium oxide interacts from water, from obtaining calcium hydroxide:
CaO + H2O = Ca (OH) 2
2) Sulfur oxide (6) interacts with water to obtain sulfuric acid:
SO3 + H2O = H2SO4
3) Calcium oxide interacts from sulfur oxide (6), from obtaining calcium sulfate:
CaO + SO3 = CaSO4