Chicken lay more eggs when happy

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?