Homework Help: Physical Science

Posted by Jess on Thursday, April 19, 2012 at 7:22pm.

The conversion of water to ice is considered a physical change, whereas the conversion of iron to rust is considered a chemical change. Why?

Physical Science - Rezu, Thursday, April 19, 2012 at 7:28pm
A chemical change is a change in which something new is formed

Physical change is a change in which the substance changes form but keeps its same chemical composition

In ice, each of the molecules is connected to the molecules next to it, making it hard. Freezing is a change of state of a material and it is a physical (not a chemical) change
Physical Science - Anonymous, Friday, April 20, 2012 at 9:11am
A rectangular container measuring 28 cm 43 cm 58 cm is filled with water. What is the mass of this volume of water in kilograms and grams? (Take the density of water to be 1000 kg/m3.)
kg
g

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