If a reaction increases the entropy of its surroundings and converts gaseous reactants to solid products, it is (exothermic/endothermic) and it is spontaneous at
(all/high/low) temperatures.
1. endothermic, high
2. exothermic, all
3. exothermic, high
4. endothermic, low
5. endothermic, all
6. exothermic, low

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false

How many moles of sulfur dioxide are produced when 4.38 moles of oxygen completely react with iron (iv) sulfide