2. an electric heating element is connected to a 110 v circuit and a current of 3.2 a is flowing though the element. how much energy is used up during a period of 5 hours by the elemets? a. 550 wh b. 2,580 wh c. 352 wh d. 1,760 wh

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

the ratio of the conjugate base to the acid required to attain the desired ph.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.