A metal pellet with a mass of 100.0 g, originally at 95°C, is dropped into a 218 g sample of water, initially at 23.8°C. Calculate the final temperature of the water and pellet. The specific heat of water
is 4.184 J/g.°C. The specific heat of the pellet is 0.568 J/g.°C.
A. 28.0 C
B. 72.0 C
C. 95.0 C
D. 41.3 C
E. 23.8 C

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

Iknow #2 is d. i just need to know why

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.