Answer:
because the water in a bottle has been purified
Explanation:
Answer: I think it's D
Explanation: None of the other options are true.
Answer:
2 Cu2O + C = 4 Cu + CO2
Explanation:
CU2O has 2 coefficient
C has 1 coefficient
Cu has 4 coefficient
CO2 has 1 coefficient
Balance Equation 2 Cu2O + C = 4 Cu + CO2
Answer:
117.3 W is being removed.
Explanation:
The heat removed can be calculated as:
Q = m*c*ΔT
Where m is the mass, c is the specific heat and ΔT is the temperature variation. Because there're two components:
Q = mwater*cwater*ΔT + maluminum*caluminum*ΔT
Q = (mwater*cwater + maluminum*caluminum)*ΔT
Searching in a thermodynamic table:
cwater = 4.184 J/g°C
caluminium = 0.9 J/g°C
In 1 minute, the temperature decreases 2.2°C, so ΔT = -2.2°C
Q = (700*4.184 + 300*0.9) * (-2.2)
Q = -7037.36 J
The rate of energy is the potency (P), which is the heat divided by the time. So, for 1 minute (60 s):
P = -7037.36/60
P = -117.3 J/s
P = -117.3 W
The minus signal indicates that the energy is being removed.
