1. a 10 g gold coin is heated from 25°c to 50°c (cau is 0.13 j/g-°c). what is the h? (points : 1) +32.5 j 25 j +25 j - 32.5 j i know it is 32.5 j but is it negative or i say it is negative, but i could be

The correct answer is + 32.5 J because heat is absorbed here by copper not evolved also after calculation we will find the H value is positive, lets calculate it:
H = m C Δt where:
m = 10 g 
C = 0.13 J/g.°C
Δ t = final temperature - initial temperature = 50 - 25 = + 25 °C
so H = 10 x 0.13 x (+25) = + 32.5 J
 

Compound with sulfer  is bright red 

The answer for this is a