Consider the following reactions: 1)
H2(g) + % O2g ---> H20. H = -243 kJ/mol
2)
% N2(g) + % 028 + 90.7 kJ --->NO(R)
3)
C(s) + % 020) ---> CO2 + 111 kl
4)
% H2(g) + %128 ---> Hlo H = 26 kJ/mol
Which of the above reactions is exothermic?

What type of chemical bond is formed between two atoms of bromine 1. metallic 2. hydrogen 3. ionic 4. covalent

Bridget is in science class. her teacher gives her two unknown substances and asks her to determine their relative ph. she places a piece of red litmus paper into both substances. the litmus paper turns purple when she places it into substance i. the litmus paper turns blue when she places it into substance ii. a. substance i is a neutral substance and substance ii is an acid. b. substance i is a neutral substance and substance ii is a base. c. substance i is an acid and substance ii is a base. d. substance i is a base and substance ii is a neutral substance.

Which temperature scale measures water boiling at 100 degrees?