Answer:
C. 3 and 4
Explanation:
Count H's in formula (each has 4)
- Hope that helped! Please let me know if you need a further explanation.
18. the blank should be "
"
19. the question seems to be answered.
20. 
Answer:
False
Explanation:
We can see the colors of the rainbow, therefore they are visible.
The answer is B, a leaf hanging on a tree
Answer:
0.385J/g°C
Explanation:
Using the following formula;
Q = m. c. ∆T
Where;
Q = amount of heat (joules)
m = mass of substance (g)
c = specific heat capacity (J/g°C)
∆T = change in temperature (°C)
According to the provided information in this question;
Q = 318 cal
1 calorie = 4.184J
318 cal = 318 × 4.184 = 1330.512J
m = 279g
∆T = 27.2°C - 14.8°C = 12.4°C
Hence, using Q = m. c. ∆T
c = Q ÷ (m. ∆T)
c = 1330.512 ÷ (279 × 12.4)
c = 1330.512 ÷ 3459.6
c = 0.385
Therefore, the specific heat of copper is 0.385J/g°C
