Consider the following statements. I. Like charges repel; II. Electrons have a positive charge; III. Objects with large amounts of charge have bigger electric fields than do objects with small amounts of charge. Which statement(s) is/are true? 1. None is true. 2. II only 3. All are true. 4. III only 5. I and II only

answer I and III are true

Explanation:

a) True. Charges of the same sign ( + and +  or - and -) repel each other

b) False. Electrons have negative charge , while protons (and also positrons) have positive change

c) True.  Bigger amounts of charge have bigger electric fields. If we follow the equation for electric field

E= k*q/r²

where k= constant , r= distance to the other charge , q=charge

then higher the charge , higher the electric field

thus answer I and III are true

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"