L 2.1.5 Quiz: Tools and Measurement al's a fail tone and
Question 1 of 5
Earth's Moon is 384,400 km from Earth. What is the correct way to write this
distance in scientific notation?
O A. 3.844 x 10-5 km
B. 3.844 x 105 km
C. 38.44 x 104 km
D. 38.44 x 10-4 km

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

Answer asap need 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.