Astudent places a 12-gram cube of ice inside a container. after six hours, the student returns to observe the contents of the container. which sentence suggests that the container is an open system? a. the container contains 12 grams of liquid water and no ice. b. the container contains 12 grams of ice and no liquid water. c. the container contains 8 grams of liquid water and no ice. d. the container contains 8 grams of ice and 4 grams of liquid water. e. the container contains 8 grams of liquid water and 4 grams of water vapor.

What is the value of keq for the reaction expressed in scientific notation

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.