A 10.0-gram sample of H2O(2) at 23.0°C absorbs 209 joules of heat. What is the final temperature of the H2O(2) sample? 1.
5.0°C
2
18.0°C
3
28.0°C
4
50.0°c

Can someone me with these questions plz.

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.