5.25 calories are absorbed by an iron nail. How many joules is this? a) 1.07
b) 9.43
c) 12.6
d) 21.9
* I NEED EXPLANATION!!! *

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

Which of these describes the rate of this chemical reaction? h2 + cl2 → 2 hcl a. an increase in the concentration of hcl and h2 with time b. an increase in the concentration of hcl with time c. an increase in h2 and cl2 with time d. a decrease in hcl and cl2 with time

Sulfur and oxygen atoms are present in sulfur trioxide, so3. to make 10^20 molecules of so3, how many atoms of s and how many of o are needed?