Calculate the change in temperature of a 650. g sample of water that loses 5480. J of energy

2

Explanation:

1) the formula of the energy is:

E=cm*Δt, where E - the value of the energy (5480 J.), c - the specific heat capacity (4200 J/(kg*C)), Δt - the difference between initial temperature and the final one (it is unknown);

2) if to perform the substitution of the values 'E', 'm' and 'c' into the formula above, then

5480=4200*0.65*Δt;

3) to calculate Δt:

Δt=5480/4200/0.65≈2 (°C).

note: the initial temperature is higher than the final.

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.