Define the following terms: solid, liquid, gas, pure substance, element, compound, homogeneous m

step 1 So we're going to be defining some of the terms in the textbook. This question is just a summary

Define the following terms: solid, liquid, gas, pure...

Key Concepts

Solution

A specific type of homogeneous mixture in which one substance, the solute, is completely dissolved in another, the solvent. This results in a mixture with consistent composition and properties throughout.

Heterogeneous Mixture

A mixture where the different components can be visually distinguished and are not uniformly distributed. The composition can vary from one part of the mixture to another.

Physical Change

A process that alters the form or appearance of a substance without changing its chemical composition. Examples include changes in state, such as melting or boiling, and processes like cutting, crushing, or dissolving.

Chemical Change

A process in which substances undergo a chemical reaction, resulting in the formation of new substances with different chemical properties. This often involves energy exchange and irreversible transformations under normal conditions.

Homogeneous Mixture

A mixture in which the composition is uniform throughout. The different components are evenly distributed and are not distinguishable from one another by simple means.

Gas

A state of matter where the particles are far apart and move freely, which means gases have neither a fixed shape nor a fixed volume. They expand to fill the container in which they are placed.

Element

A pure substance that cannot be broken down into simpler substances by chemical means. Elements consist of only one type of atom and are the basic building blocks of matter.

Solid

A state of matter characterized by particles that are closely packed together, giving solids a definite shape and volume. The particles vibrate in fixed positions, which results in the rigidity typically associated with solids.

Liquid

A state of matter in which the particles are less rigidly arranged than in a solid, allowing liquids to flow and take the shape of their container while retaining a fixed volume. The particles are still close together, giving liquids some cohesive properties.

Compound

A pure substance composed of two or more different elements that are chemically bonded in fixed proportions. Compounds exhibit properties that are different from those of their constituent elements.

Pure Substance

A type of matter that has a uniform and definite composition. Every sample of a pure substance has the same chemical properties, and it can be either an element or a compound.

Transcript

00:01 So we're going to be defining some of the terms in the textbook.

00:03 This question is just a summary of a lot of the really important vocabulary in the textbook.

00:07 So we're going to start with the phases of matter.

00:09 So what differentiates the three phases is whether or not they have a definite shape and a definite volume.

00:16 Right.

00:17 So solids have both definite shape and volume.

00:20 So some kind of a block, like a block of wood, has the same shape and the same volume until you burn it or something, right, until you do something to it.

00:35 But otherwise, it's going to remain a solid.

00:38 Wickeds have a definite volume, but they can change their shapes, depending on what kind of a container it's in.

00:45 Right.

00:45 So if i have a glass of water, let's say the water is going to stretch out to fill the width of the container, but as soon as i transfer that to a thinner container, right, it's going to take the shape.

01:03 The amount of water i put into that larger beaker might fill this vessel entirely because it takes the shape in the container.

01:10 And gases are the same way, but gases don't have a definite volume either.

01:14 Gases are going to expand to fill the shape of the container depending on what kind of a container it is, what size container.

01:27 So there's no shape or volume when it comes to gases.

01:33 Pure substances, right? so pure substances have constant chemical composition.

01:40 So when we're talking about something that's pure, doesn't have anything else with it.

01:45 Right.

01:45 So if i mix together sugar and salt, that's not a pure substance.

01:49 Salt, sodium chloride by itself, is a pure substance.

01:55 Sugar by itself is a pure substance, but once i put them into contact with anything else, it no longer becomes a pure substance.

02:03 Elements are the base units of chemistry.

02:06 So elements, you can't break down an element further into something smaller by any type of physical or chemical means.

02:16 Compounds, though, you can break down into elements, right? so that means that compounds are composed of two or more elements chemically combined.

02:27 So, for example, with enough energy, and it takes a lot of energy to do this, believe me, you can actually break down water into hydrogen gas and oxygen gas.

02:39 It takes a lot of energy, but you can do it.

02:43 That's why water is a compound.

02:45 Hydrogen gas and oxygen gas are both elements.

02:49 We had to find these in a previous question, but we can do it again because the question calls for it, right? the way that the textbook defines these mixtures is that a homogenous or a homogeneous mixture has visibly indistinguishable parts, which would mean that when you look at it at whatever scale, so if you're just staring at a glass of water, you might not know whether or not it has salt dissolved in it...

Please give Ace some feedback