Data:
Q (Amount of heat) = 832 J
m (mass) = ?
c (Specific heat) = <span>0.90 J/(g × ° C)
T (final) = 97 ºC
To (initial) = 20 ºC
</span>ΔT = T - To → ΔT = 97 - 20 → ΔT = 77 ºC
Formula:
Q = m*c*ΔT
Solving:
Q = m*c*ΔT
832 = m*0.90*77
832 = 69.3m
69.3m = 832
C. Because skin acts like a barrier that doesn’t allow pathogens or other micro organisms to enter unless their is a cut, scratch, etc. on your skin.
Zn(s) + HCl(aq)→ ZnCl (aq) +H2 (g) the combination that will affect the rate of reaction is
Temperature, concentration and surface area (answer A)
If Zn(s) is broken into powder the surface area increases leading to speeding up the rate of reaction. When the concentration of the of dissolved reactant is increased the rate of reaction increases. An increase in temperature led to increase in movement of particle and more collision happen hence the rate of reaction is increased.
K = °C + 273
K = 458 °C + 273
K = 731