Asheet of nickel weighing 10.0 g is placed in 20.0 g of water at a temperature of 18.0 °c. the final temperature of the water is 25.0 °c. what was the starting temperature of the nickel sheet?

The starting temperature of the nickel sheet is 158.16 °C

Explanation:

Step 1: Data given

Mass of nickel = 10.0 grams

Mass of water = 20.0 grams

Cp of water = 4.184 J/g°C

Cp of nickel = 0.440 J/g°C

Initial temperature of water = 18.0 °C

Final temperature of water ( and nickel) = 25.0 °C

Initial temperature of Nickel = TO BE DETERMINED

Step 2: Calculate the starting temperature of nickel

Qgained = -Qlost

Qnickel = -Q water

Q =m*c*ΔT

with m = mass (in grams)

with c = the specific heat capacity (in J/g°C)

with ΔT = The change in temperature = T2 -T1 (in °C)

- Qnickel = Qwater

-10.0g * 0.440 J/g°C* ΔT = 20.0g * 4.184 J/g°C *( 25.0-18°C)

4.4 * ΔT = -585.76

ΔT = -133.13

ΔT =T2 -T1

-133.13 = 25.0 - T1

T1 = 25 + 133.16 = 158.16 °C

The starting temperature of the nickel sheet is 158.16 °C

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answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e