Question

Colton has an ice cube that has a mass of 4 grams. He places it in a sealed container and then puts it in the microwave on high. The ice cube melts after a few seconds. He removes the sealed container with the melted ice cube and checks the mass again.

Which sentence best describes what Colton discovers?

A) The mass of the melted ice cube was less than 4 grams.

B) The mass of the melted ice cube was more than 4 grams.

C) The mass of the melted ice cube could not be determined.

D) The mass of the melted ice cube remained the same at 4 grams.

Answer 1

Answer: D) The mass of the melted ice cube remained the same at 4 grams.

Step-by-step explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

`H_2O(s)\rightarrow H_2O(l)`

Given: mass of ice = 4 grams

mass of water = 4 grams (as mass of reactant = mass of product as the container is sealed and no matter can leave the container)

Thus the mass of the melted ice cube remained the same at 4 grams.

Answer 2

The correct choice is

D) The mass of the melted ice cube remained the same at 4 grams.

mass is given as the product of density of substance and volume of substance.

mass = density x Volume

initially , we had ice of mass 4 g having certain density and volume. after the ice is put into the container and it melts , the ice converts to water which has a greater value of density as compared to solid ice. also , as the ice melts , its volume decreases to keep the mass same.