Consider the reaction Ca(OH)2(s)→CaO(s)+H2O(l)Ca(OH)2(s)→ CaO(s)+H2O(l) with enthalpy of reaction ΔHrxn∘=65.2kJ/molΔHrxn∘=65.2kJ/mol What is the enthalpy of formation of CaO(s)CaO(s)?

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

How many atoms are there in 5.70 mol of mg