HELP PLZ

2C4H10(9) + 1302(g) → 8C02(g) + 10H2O (9)
What type of reaction is this?

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?