Introduction
Video
All right, let's go over this uh mixtures versus pure substance, worksheet that you guys did yesterday uh.
You were to identify each material as either a mixture or a pure substance, and then, if it was a substance, you had to decide if it was an element or a compound.
If it was a mixture, then either homogeneous or heterogeneous.
Okay, all right! So, let's go through it.
First one was aluminum foil.
That was a substance.
It is one type of atom, aluminum rolled into a like foil or sheet.
So since it's only one type of atom, it's considered an element.
So let me show you that on the periodic table, so here are the periodic table of elements, there's a lot of them, and if we find that particular name aluminum on the periodic table of elements, then it is a substance.
A pure substance with just one kind of atom, so here it is number 13 on the periodic table.
So all of the atoms in aluminum foil are just aluminum.
That's it one kind of atom.
So that's what makes it an element.
The next one is air air is a mixture it's homogeneous.
This means that it is uniform throughout it's a mixture, because it's made up of many types of gases and the gases that make up air sure those are substances, but when they're mixed together in the air in the atmosphere, it's a mixture.
So our atmosphere is made up of more than one kind of element or compound or substance.
So air is a mixture.
Soil soil is considered a mixture.
We can see usually see all the different pieces of the soil.
Sometimes soil can be considered homogeneous if it is more uniform throughout, but if you actually took a magnifying glass up to it, you would see the different elements, the different pieces of the soil, so we're going to call that heterogeneous water is a substance.
So, let's talk about that aluminum foil was a substance and it was an element.
Water is something different, it's a substance, but it's not on the periodic table of elements.
But it's made up of two types of atoms that are on the periodic table of elements and those atoms are chemically combined, which means that they're more attached they are attached to each other.
So if we look at the periodic table of elements, we will not find h2o, which is the chemical compound for water, but we will find what makes up water oxygen and hydrogen so when those two elements are combined to make water, it's a compound.
Okay, so a substance steel.
This is a mixture of different kinds of metals.
So again, on the periodic table: we're not going to find steel, you could search and search and search and search, and you won't find the steel mixture, but you will find different things that make up steel like iron, which is in steel, okay.
So it's a bunch of different metals mixed together.
They are not chemically combined, it is uniform throughout.
We cannot see the different types of metals in there they're evenly mixed, so it's homogeneous m.
Ms, is a mixture.
Even a single m m is a mixture.
The bag of m ms you've got the different colors right that makes it heterogeneous.
Even a single m m is heterogeneous.
You have the shell, you have the chocolate, so you don't have uniform mixed throughout sugar.
This is a substance.
Okay, it is a compound.
You won't find sugar on the periodic table, but you will find the elements that are chemically combined connected to make up sugar.
So sugar is carbon and it is oxygen and it is hydrogen.
So i've always said c6 h12o6 and the numbers just mean how many carbons? Six carbons: how many hydrogens 12 hydrogens, how many oxygens six oxygens in the single molecule, so they are chemically combined that makes them a compound sugar water.
Now this is when we take sugar and we pour it into water and the sugar will dissolve.
It still is a mixture.
The sugar does not chemically combine with the water, the sugar just kind of nestles their way into the spaces of the water molecules.
So you've got the sugar water molecules just really sitting next to water molecules, but not attached.
They'Re, not attached.
They're just sitting near water molecules that makes them a mixture, and this is uniform throughout pizza - is a mixture you can see all the different parts of the pizza.
Okay blood is a mixture.
You can see all you cannot see all the different parts of blood.
It is uniform throughout so that makes it homogeneous table salt.
This is an edible thing, something that you pour on your french fries.
It is a substance again on the periodic table.
We won't find salt as a an element, but we will find it things that make up the salt that are chemically combined.
That means that the elements are attached to each other, so sodium over here chlorine atoms over here.
I actually have what that molecule looks like, so this is sodium chloride.
This is sodium atoms attached to chlorine atoms and it makes this you know crystal like structure that have our atoms but notice that they are attached to each other.
That makes it a compound that makes it a pure substance.
Iron fillings, iron fillings are just pieces of iron that have been filed down into small tiny, like flakes filings fillings filings, but that is an element, oops, sorry substance.
First, then, it is an element.
It is on the periodic table, doesn't matter what form it's in whether it's part of a bar of iron or it's a filing like filed down into smaller pieces.
It is on the periodic table and it is uh iron.
Okay, right here, gasoline, that's a mixture.
It is made up of many different kinds of compounds: okay, it is homogeneous, so it's a mixture of a bunch of different chemicals and they aren't chemically combined they're mixed together, coffee, okay, so uh, if you were questioning, is this just coffee beans? Was this a cup of coffee? It was really a cup of coffee, so that would make it a mixture, because you've got it mixed in with water and coffee would be.
A cup of coffee would be homogeneous.
Okay, orange juice, that is, a mixture even pure orange juice like coming straight from an orange, and then you drink it.
It's still a mixture because you've got the pieces of the orange.
You have the sugar part of the orange and the water a lot of water.
You have acetic acid, so you've got different things that make up oranges, but orange juice is also a mixture and it is uniform throughout now.
I'M talking i'm talking about the uh non-pulp orange juice.
I guess, if you had more pulp like orange juice, it could be heterogeneous, cannot seem to spell that all right, pencil lead so pencil lead a long time ago was made out of actual lead, see if i can find lead on the periodic table.
It's kind of hard there.
It is right there lead okay, so it's an element, but nowadays pencils are made of something called graphite, which is uh like compressed kind of or processed kind of carbon, which is on the periodic table.
So carbon is an element as well.
So whether it was pencil lead from 40 years ago, 50 years ago, 60 years ago or pencil lead that is made out of graphite, it's still an element, it is a oops substance, then an element: okay, copper, something on the periodic table a metal there.
It is so that makes it a substance, and that makes it an element, one kind of atom bronze.
You won't find bronze on the periodic table, it's a blend of metals, so that makes it a mixture, and it is i'm a genius.
Milk and cereal you've got the milk.
You've got the cereal you've, combined them mixed them.
That is a mixture.
You can see the different parts of the cereal and you can see the milk heterogeneous acetic acid is a substance.
It's a compound.
You won't find it on the periodic table, but it is a chemically combined.
So the atoms, the elements are chemically combined to make the acetic acid, so that makes it a compound.
Okay.
I know that this third column was more of a stretch, so i hope you tried to challenge yourself a little bit.
You will not be have to do this part, the third column, on the quiz you are just going to have to uh decide if the material is a substance or a mixture.
Okay, ah all of the items on the quiz are things that are either in this sheet or in the slideshow that i, the video that i did yesterday you'll find all of these things on the quiz so use these, as your study guide, make sure that you Know sugar is a substance.
Sugar, water is a mixture, blood is a mixture table.
Salt or just salt is a substance, so you know kind of quiz yourself test yourself go through the powerpoint again the google slideshow, which is the video, but you guys have access to just the google slideshow.
If you want to review all of the examples there as well, okay, one thing i wanted to clarify uh the difference between baking, soda and baking powder.
So there might be some confusion on these two things.
They are two different things that are used in baking: okay, baking soda is just sodium bicarbonate.
That is a molecule, so that is a compound made up of sodium atoms and carbon atoms and oxygen atoms all chemically combined.
So it is a substance.
So one way to remember that baking soda is a substance, is look at the s.
Okay, baking soda s substance, whereas baking powder is made up of sodium bicarbonate and other ingredients.
So when it says, plus an acidifying agent and a drying agent.
Well, you've got more ingredients there that makes it a mixture, so baking soda one molecule one compound substance: there's that s baking powder, which is a compound, so i just wanted to clarify that.
Okay, all right, let me know if you have any questions through email or you can send me a private message through google classroom go ahead and turn this in once you've gone over it and you fixed your answers.
You can turn it in okay.
Also.
You also have an assignment in google classroom, and this is just a kahoot that you can use to practice.
Okay, i've also uploaded a practice quiz.
So the take the practice quiz see how you do if you get 100 on the practice quiz, you still have to take the quiz tomorrow, all right so you're just practicing today.
But yes, you still have to take the actual quiz tomorrow, even if you get 100 on the practice quiz today, all right see you later have a good day.
You
FAQs
Mixture vs Pure Substance Review? ›
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous.
What is the difference between pure substance and mixture PDF? ›Mixtures are made up of more than one type of particle and can be separated into their component parts by physical changes. Pure substances are made up of a single type of particle and cannot be formed or broken down by physical changes. 18 Water is a pure substance / mixture.
What are the types of mixtures review? ›There are two types of mixtures: heterogeneous and homogeneous. Heterogeneous mixtures have visually distinguishable components, while homogeneous mixtures appear uniform throughout. The most common type of homogenous mixture is a solution, which can be a solid, liquid, or gas.
What are pure substances and mixtures review? ›Pure substances are always homogeneous. The ideal pure substance contains molecules of only that substance, and nothing else. Mixtures may be homogeneous (if they are solutions) or heterogeneous. If they are heterogeneous, that means that different substances are throughout the mixture.
How do you determine if a substance is pure or a mixture? ›Steps to Distinguish between Mixtures and Pure Substances
If the particles are all the same, then it is a pure substance. Step 2: Look at the composition of the particles within the substance and determine if there are two or more types of particles. If the particles are different, then it is a mixture.
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous.
What are three differences between mixtures and pure substances? ›The physical properties of pure substances are definite and constant. Mixtures have varying physical properties. The chemical properties of pure substances are constant and definite too. Mixtures have variable or indefinite chemical properties.
What are the 3 different types of mixtures? ›Mixtures can be classified on the basis of particle size into three different types: solutions, suspensions, and colloids. The components of a mixture retain their own physical properties.
Is Sugar a pure substance or a mixture? ›Sugar is classified as a pure substance and not a mixture because: It consists of a single type of particles made by combining two or more elements in a defined ratio, i.e. it is a compound having a molecular formula of C12H22O11, while mixtures have no definite composition.
What are 3 different examples of mixtures? ›- Crude oil: A mixture of organic compounds (mainly hydrocarbons)
- Seawater: A mixture of various salt and water.
- Air: a mixture of various gases like oxygen, carbon dioxide, nitrogen, argon, neon, etc.
- Ink: A mixture of coloured dyes.
What are the different types of pure substances and mixtures? ›
Types of Substances
Examples of pure substances include iron, aluminum, silver, and gold. Mixtures: Substances that have two or more different particles are mixtures. Examples of mixture include the salt solution which is a 'mixture' of two components, salt, and water.
By studying how chemists distinguish pure substances from mixtures and solutions, students will start to appreciate how matter is organised at the atomic level. With this knowledge, we can manipulate matter to improve our health and quality of life.
What are 5 types of pure substances? ›Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate).
How do you identify a pure substance? ›In order to identify a pure substance you need to look at how many different elements and/or compounds it is made of. If it only contains one type of element, or one type of compound, it is a pure substance.
What identifies a pure substance? ›Physical properties of a substance are characteristics that can be observed without altering the identity of the substance. Color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.
Is water a mixture? ›Water, H2O, is a pure substance, a compound made of hydrogen and oxygen. Although water is the most abundant substance on earth, it is rarely found naturally in its pure form.
How will you describe mixture? ›A mixture is a physical combination of two or more substances that aren't chemically joined. For example, water and salt are separate substances that once mixed, create a mixture - seawater.
Which is considered a mixture? ›What is a mixture? A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs. A mixture can usually be separated back into its original components. Some examples of mixtures are a tossed salad, salt water and a mixed bag of M&M's candy.
What is a main difference between a mixture and a pure substance quizlet? ›A pure substance is made up of only one kind of particle. For example, table sugar only contains sugar particles and distilled water contains only water particles. Mixtures are made up of pure substances combined together. A mixture is composed of at least two different kinds of particles.
How do pure substances and mixtures compare and give an example of each? ›The properties of a pure substance are always the same, whereas the properties of a mixture can vary depending on the composition of the substances that make it up. For example, water is a pure substance made up of two hydrogen atoms and one oxygen atom.
What are properties of pure substances? ›
Characteristics of pure substances
Pure substances are uniform and constant. Pure substances always have specific or fixed melting points and boiling points. Predictable subjects are formed when pure substances come under chemical reactions.
- Oil and water.
- Lemon juice and tea.
- Honey and tea.
- Milk and chocolate.
- Coffee and cream.
- Cream and sugar.
- Coffee and sugar.
- The composition of the mixture is variable it is not fixed.
- In a mixture the constituents particles do not lose their original identity that is mixture basically retains the characteristic of its constituents.
- Mixtures do not have a fixed melting and boiling point.
Pure substances can be divided into two categories, elements and compounds. You already know that elements are pure substances that cannot be broken down into simpler substances. When elements combine, they form new substances called compounds.
Is milk a mixture or pure substance? ›Milk is a mixture of water, milk, protein, and fat. it can be split into two or more different substances. Hence, milk is not a pure substance.
Is pizza a pure substance or a mixture? ›Pizza is a mixture of dough, sauce, cheese, and other toppings.
Is Vinegar a pure substance? ›Vinegar is an example of a homogeneous mixture, and not a pure substance since water, its solute, is dissolved in the solvent, being acetic acid. Homogeneous mixtures are also known as solutions, which are mostly composed of liquids (including vinegar), but can include gases.
Is Vinegar a mixture? ›Vinegar is another homogeneous mixture which contains acetic acid mixed with water. Homogeneous mixtures such as soft drinks & vinegar are also called solutions.
Is salt a pure substance? ›Ordinary table salt is called sodium chloride. It is considered a pure substance because it has a uniform and definite composition. All samples of sodium chloride are chemically identical. Water is also a pure substance.
Is soda a mixture? ›Soda is a mixture of water and carbon dioxide.
Is honey a pure substance? ›
Honey is an example of a pure substance.
Is coffee a pure substance or mixture? ›Explanation: Coffee contains a variety of chemicals that are dissolved in water during the brewing process. Since multiple different chemicals are present, coffee is a mixture.
Is Ice a pure substance? ›Ice is the solid form of water. Since water is a compound made up of hydrogen and oxygen atoms, ice is also a pure substance.
What are the 4 types of mixtures? ›- Homogeneous Mixture.
- Heterogeneous Mixture. Solutions. Colloids. Suspensions.
- Sand and water.
- Salt and water.
- Sugar and salt.
- Ethanol in water.
We need pure substances to: Measure accurate properties of the substance. Carry out chemical reactions without side effects of impurities. Use drugs for medical use without interference from impurities.
What are 10 examples of pure substance? ›- Water.
- Diamond.
- Gold.
- Helium.
- Iron.
- Table salt (sodium chloride)
- Ethanol.
- Brass.
Water is a pure substance because it contains only one type of molecule. Pure water is made by the chemical combination of hydrogen and oxygen. One oxygen is bonded to two hydrogen. And it always has fixed composition.
Is air a pure substance? ›Air is not a pure substance.
Is Blood is a pure substance? ›Blood can be classified as a mixture because: Blood consists of various types of cells, proteins along with plasma most of which is water.
Is Wood a pure substance? ›
Wood is not a pure substance but a homogenous mixture because it is composed of compounds such as cellulose, hemicelluloses, and lignin which are made up of elements such as carbon, hydrogen, and oxygen which are found in varying concentrations in the wood body.
What is the difference between a pure substance and a mixture for kids? ›The physical and chemical properties of pure substances are non-changing, if it is on its own without disturbing. A Mixture is made up of a combination of two or more substances that are not united using a chemical reaction. The physical and chemical properties of mixtures vary.
What is an example of a pure substance and a mixture? ›Examples of pure substances include iron, aluminum, silver, and gold. Mixtures: Substances that have two or more different particles are mixtures. Examples of mixture include the salt solution which is a 'mixture' of two components, salt, and water.
What is the difference between the two types of pure substances? ›They have definite composition and are of two types: elements and compounds. Elements are made up of only one kind of atoms. Whereas compounds are pure substances formed by chemical combination of two or more elements in a definite proportion by mass.
What are 3 examples of mixtures? ›- Crude oil: A mixture of organic compounds (mainly hydrocarbons)
- Seawater: A mixture of various salt and water.
- Air: a mixture of various gases like oxygen, carbon dioxide, nitrogen, argon, neon, etc.
- Ink: A mixture of coloured dyes.
Water, H2O, is a pure substance, a compound made of hydrogen and oxygen. Although water is the most abundant substance on earth, it is rarely found naturally in its pure form. Most of the time, pure water has to be created.
Which is not a pure substance? ›Sugar solution is a mixture and made up of different kinds of molecules. So it is not a pure substance.
Is a compound considered a pure substance Why or why not? ›Compounds are pure substances made of two or more kinds of atoms bound together. Compounds can also be broken down into simpler substances. Some elements have one letter for their symbol while other elements have two letters. When we write symbols for a compound it is called a formula.
What are 4 examples of pure substances? ›Some examples of pure substances are Gold, Water, Saline solution, Brass, Ethanol, Vinyl, Helium, Bronze, Iron, Diamond, and Saline Solution. Elements refer to those pure substances that cannot be disassembled into different simpler substances as they are composed of only one kind of atoms and molecules.
Is milk a pure substance or a mixture? ›Milk is a mixture of water, milk, protein, and fat. it can be split into two or more different substances. Hence, milk is not a pure substance.
Is sugar a pure substance or a mixture? ›
Sugar is classified as a pure substance and not a mixture because: It consists of a single type of particles made by combining two or more elements in a defined ratio, i.e. it is a compound having a molecular formula of C12H22O11, while mixtures have no definite composition.
What is an example of a pure substance? ›Examples of pure substances include tin, sulfur, diamond, water, pure sugar (sucrose), table salt (sodium chloride) and baking soda (sodium bicarbonate). Crystals, in general, are pure substances. Tin, sulfur, and diamond are examples of pure substances that are chemical elements. All elements are pure substances.
What are two examples of pure substances? ›- Gold. It has the same composition no matter where it comes from. ...
- Diamonds. They are formed deep within Earth in only a very few areas. ...
- Water. Considered a pure substance if the water contains only hydrogen and oxygen. ...
- Baking soda. ...
- Table salt.
Mixtures and pure substances are similar in that they are both matter, so they are both composed of atoms. The main distinction is that mixtures are not chemically bonded and are able to be physically separated. Pure substances are chemically bonded and cannot be separated physically.