10. If two substances react and the temperature of the mixture increases, the reaction is a) Endothermic
b) Not one that produces anything new
c) One that needs a catalyst
d) Exothermic

Of the groups of elements below, which are most likely to gain electrons to become anions? a. alkali metal b. boron group c. halogen d. transition metal

1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle

Which characteristics can be used to differentiate star systems? check all that apply.