An 8.5g ice cube is placed into 255g water.
calculate temperature change in water upon the complete melting of the ice. (assume all the energy required to melt the ice comes from the water. )

2834.75 = 255 (4.16) (T)

T = 2.67K

The law of conservation of energy is an important concept for solving this problem. The energy released is enough for the energy absorbed.

Ice undergoes a heat of transformation. This means there is a phase change but not temperature and therefore energy is resolved by (fusion enthalpy) (mass) = 333.5J / g) (8.5g). = 2834.75J.

This is enough for the energy released by water. Energy calculated by (mass) (specific water heat) (temperature change) = (255g) (4.16J / gK) (T)

In physics, the law of conservation of energy states that the amount of energy from a closed system does not change - it will remain the same. That energy cannot be created or destroyed by humans, but it can change from one form of energy to another. For example, chemical energy can be converted into kinetic energy in dynamite explosions.

The most common definition of energy is a work that can be carried out by certain forces (gravity, electromagnetic, etc.).

Energy is a conserved quantity. Because of various forces, such as gravity, electricity, heat and so on, energy has various forms.

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The law of conservation of energy  

Type of Energy  

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Grade: High School

Subject: Chemistry

Keyword: conservation, law, energy

where are the choice options?

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o