law of conservation of matter game online

After some time the ice cubes melt, but the scales still show five hundred grams.

VOICEOVER: Zach has a bowl of ice cubes with a mass of five hundred grams. Here's a couple more examples to prove it too. So, in other words, the mass is conserved. But, because atoms can't be destroyed, the ice still has the same amount of stuff in.

So, when water freezes it makes the atoms rearrange themselves so the result is the ice. But, the number of atoms will still be the same before and after reaction. So, when a physical change or a reaction takes place, atoms in a starting substance rearrange themselves and join back together to form a new substance. Miss Roberts: No, it's because the tiny particles that make up stuff or the matter in an object - known as atoms - they cannot be destroyed. But, the mass has in fact stayed the same. Miss Roberts: So, it may look like the mass has increased, because the ice takes up more room than the liquid water.

So, surely the mass has increased, proving science wrong? You know, the ice fills up more of the bottle. Katie: Well, what I see there is that it's increased. So, earlier I froze an identical bottle with three hundred grams of water. But, the interesting thing is that although the water changes to ice the mass will stay the same. Miss Roberts: So, when you freeze water a physical change happens, because it turns from water to ice. So, what's with the bottle of water, then? Are you just thirsty? And I want to show you what happens when a chemical reaction takes place or when there is a physical change in something that the mass stays the same. So, this bottle of water has a mass of three hundred grams. Now, mass is the measure of how much stuff or matter is in an object and it's measured in either grams or kilograms. Miss Roberts: OK, so we are looking at the conservation of mass. Katie: OK, it's says three hundred grams. Miss Roberts: So I want you to put that bottle of water, please, on to the scales and tell me what it says in grams. Miss Roberts: It sounds tricky, but it's easier if I just show you. Miss Roberts: So, today we're looking at the conservation of mass.

Law of conservation of matter game online