Heat is applied to an ice cube in a closed container until...

Name: Problem 4, Chapter 2: Chemistry
Uploaded: 2019-07-26T19:25:21-08:00
Duration: 3 min 53 s
Channel: Lena Jake
Description: Heat is applied to an ice cube in a closed container until only steam is present. Draw a representation of this process, assuming you can see it at an extremely high level of magnification. What happens to the size of the molecules? What happens to the total mass of the sample?

Heat is applied to an ice cube in a closed container until only steam is present. Draw a representation of this process, assuming you can see it at an extremely high level of magnification. What happens to the size of the molecules? What happens to the total mass of the sample?

Key Concepts

Molecular Kinetic Energy

This concept refers to the increase in the speed and energy of molecules due to heat. Higher kinetic energy in a gas leads to more vigorous molecular motion and greater separation between molecules compared to the structured arrangement in a solid, although the intrinsic size of the molecules does not change.

Conservation of Mass

This principle states that mass is neither created nor destroyed in a closed system during a physical process such as heating. Despite the transformations from ice to steam, the total mass of the sample remains constant throughout the phase transitions.

Phase Transitions

This concept covers the changes of state in matter—transitions from solid (ice) to liquid (water) and liquid to gas (steam). It explains how molecules change their arrangement and mobility during heating, with closely packed forms in solids gradually becoming loosely arranged in gases while their inherent properties remain unchanged.

Transcript

00:01 So this video we're gonna talk about question for from chapter two, which says he is applied to an ice cube in a closed container until only steam this present draw a representation of this process, assuming you can see it having extremely high level of magnification, what happens to the size of molecules? what happens to the total mass of example? um, so basically, we're heating ice until it melts into water and that water of operates and esteem so we have we're starting out with a solid form of water on we're moving on to the liquid form or we really move on to the gas form of the same molecule of water, which is a tsh to 02 hydrogen and one oxygen.

00:50 So since we've sealed this fixed number of water molecules h 20 inside of the closed container, even though we're seeing exchanges, um, from solid to liquid to gas, this face changes water.

01:05 The mass is not changing because we have a fixed number of water molecules.

01:10 Um, that's not changing within our container and those molecules way a specific amount.

01:16 So the mass of the molecules, the total mass of the sample is not changing.

01:21 As for what happens to the size of the mauling cools.

01:25 Similarly, even though we're talking about solid liquid and gas basins of water, we're still just talking about water molecules on since water molecules are made up of hydrogen atoms and oxygen atoms, um, the size of the molecule itself is not changing it all.

01:44 So what happens to the size of molecules? nothing at all.

01:47 And what happens to the total mass of example of nothing at all? so what does happen? so when we start out with solid water, some hero i've drawn oxygen atoms red and hydrogen adams in blue, and the oxygen atoms are much larger than the hydrogen atoms on the way i've drawn them.

02:07 I realized that now kind of look like mickey morals.

02:09 But that's okay.

02:11 Um, so we started with our solid and things are pretty ordered almost in a race structure, and things were kind of held at a fixed distance between atoms because we have these hydrogen bonds occurring between the hydrogen of one water molecule and the oxygen of another molecule on these air.

02:32 These air kind of held at a fixed distance on and things aren't moving...

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