answersLogoWhite

0


Best Answer

Negtive

User Avatar

Wiki User

11y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: Does Ice melting have a positive or negative enthalpy?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Continue Learning about Natural Sciences

Does the sign of the enthalpy of fusion change depending on the direction of the phase change for example the enthalpy of fusion of water is 6025 JK per mol and going from liquid to ice is -6025?

The sign only depends on whether it's an exothermic or endothermic reaction. So no, it doesn't depend on phase change, and in some reactions, there is no phase change. But you will find correlation between the sign and the direction of the phase change because they will either be endothermic or exothermic. The enthalpy of fusion is positive because melting is an endothermic reaction (think - you put in heat to melt an ice cube). Endothermic reactions are represented by positive enthalpy. Conversely, freezing is an exothermic process (heat is taken out of the molecules in order to slow them down). We represent exothermic reactions with negative enthalpy.Always be conscious of the sign when working with thermochemistry calculations. Unlike the usual math, the signs of these numbers are somewhat arbitrary. We say that the system is losing heat in an exothermic reaction; thus, the energy must be represented by a negative. However, there are a few areas (like electrical engineering) where an exothermic reaction is represented by a positive number (because usually the goal is to produce heat).


Is ice melting ice a physical or chemical change?

melting ice a physical change


How many calories are required at 0 degree Celsius to melt an ice cube with a mass of g?

What you need is the enthalpy of fusion for ice and simply multiply it by your mass. An online search shows that the enthalpy of fusion for ice is: 79.72 cal/g So calories needed to melt all your ice is just. Energy = 79.72cal/g x 25g = 242.50 calories


Is ice melting a chemical or physical changes?

melting ice a physical change


Is a ice melting physical or chemical change?

melting ice a physical change

Related questions

Explain the combined effects of entropy and enthalpy during the melting of ice?

There are two tendencies in nature: things tend to go to the lowest possible energy (enthalph) level (delta H = negative) and the highest possible state of disorder (entropy)


What is thermal energy of melting?

its the latent heat of fusion or simply Enthalpy of fusion.ie,this heat is absorbed or added at melting temperature.for eg latent heat of fusion of ice= 6.02 KJ/mol (80cal/gm).


What does melting ice do?

Melting ice turns the ice into water.


Does the sign of the enthalpy of fusion change depending on the direction of the phase change for example the enthalpy of fusion of water is 6025 JK per mol and going from liquid to ice is -6025?

The sign only depends on whether it's an exothermic or endothermic reaction. So no, it doesn't depend on phase change, and in some reactions, there is no phase change. But you will find correlation between the sign and the direction of the phase change because they will either be endothermic or exothermic. The enthalpy of fusion is positive because melting is an endothermic reaction (think - you put in heat to melt an ice cube). Endothermic reactions are represented by positive enthalpy. Conversely, freezing is an exothermic process (heat is taken out of the molecules in order to slow them down). We represent exothermic reactions with negative enthalpy.Always be conscious of the sign when working with thermochemistry calculations. Unlike the usual math, the signs of these numbers are somewhat arbitrary. We say that the system is losing heat in an exothermic reaction; thus, the energy must be represented by a negative. However, there are a few areas (like electrical engineering) where an exothermic reaction is represented by a positive number (because usually the goal is to produce heat).


How does molar enthalpy of fussion of ice compare with the molar enthalpy of fussion of other solids?

it is relatively large


Is ice melting ice a physical or chemical change?

melting ice a physical change


What are the positive and negative in hockey for PIM?

You get a "+1" for being on the ice when your team scores and a "-1" when your on the ice when the opposing team scores


Is ice melting chemical reaction?

ice melting is a physical reaction


Does nitrogen have a positive or negative charge?

both. no plant can live without it, having to use photosynthesis to get food. there are also downsides, the polar ice caps are melting which is causing the sea level to rise therefore changing the weather Also it has no charge it's a compound not an ion.


How many calories are required at 0 degree Celsius to melt an ice cube with a mass of g?

What you need is the enthalpy of fusion for ice and simply multiply it by your mass. An online search shows that the enthalpy of fusion for ice is: 79.72 cal/g So calories needed to melt all your ice is just. Energy = 79.72cal/g x 25g = 242.50 calories


Why do ice cream melting?

Ice cream are do melting because it are because hot.


Is ice melting a chemical or physical changes?

melting ice a physical change