Is Water An Element Compound Or Mixture – Elements and compounds are clean. False 2. Mixtures and compounds are pure. Real mixtures can be separated by physical means. False elements can be broken down into simpler substances. False 5. Salt water is a compound.

Chapter 9 Today’s Objective: I can distinguish the arrangement of particles between elements, compounds, and mixtures. I can identify the different parts of a solution. I can distinguish between a heterogeneous and a homogeneous mixture.

Is Water An Element Compound Or Mixture

Homogeneous – mixture is the same everywhere (Ex: Solutions like lemonade) Heterogeneous – mixture where particles remain physically separated (Ex: Salad, Bag of M&Ms)

Elements, Compounds, And Mixtures. What Are The Basic Differences? Element Any Substance That Contains Only One Kind Of Atom Cannot Be Broken Down Compound.

22 On your lab bench… Look at each diagram and identify it as one of the following: 1) Element 2) Compound 3) Mixture—This can be a mixture of elements, a mixture of compounds, or a mixture of compounds and an element.

The hydrogen atoms were drawn larger than the oxygen atom. Hydrogen atoms were shown to be of different sizes. It had one less hydrogen atom. There was one more oxygen atom.

24 Let’s review… 2. When sodium, a soft metal, combines with chlorine, a poisonous gas, salt, is formed. Which statement is true about this combination? Sodium and chlorine physically combine to form a new substance that retains the properties of the original substances. Sodium and chlorine combine chemically to form a new substance with new properties. Salt maintains some, but not all, of the physical properties of sodium and chlorine. Salt can easily be split back into sodium and chlorine.

25 Let’s Review… 3. Which chemical cannot be further broken down into other chemicals using ordinary laboratory processes? 1 2 3 4

Help!! 29 Pointss Label These As Either Element Compound Mixture Of Elements Mixture Of Compounds

26 Let’s Review… Based on the information in the table, which mineral is also an element? Graphite Quartz Calcite Hematite

To make this website work, we register user data and share it with processors. To use this website, you must agree to our Privacy Policy, including our Cookie Policy. made of two or more different kinds of atoms CHEMICALLY combined/bonded together Can be separated by CHEMICAL REACTIONS Mixtures physical combinations of different substances can be separated by using different physical properties of the different components of the mixture.

7 types of mixtures homogeneous heterogeneous Sort the descriptions looks like a substance can identify different components solution air brass soil

What are the subscripts for each of the following formulas? What if an element has no subscript? What information does the index tell you?

Determine Whether Each Molecular Diagram Represents A Pure Substa…

What are the subscripts for each of the following formulas? What if an element has no subscript? We assume it is “1” 2H2O1 2Na1O1H1 What information does the subscript tell you? The number of atoms of each element in a molecule.

2NaOH 8H2 4Ag O2  8H2SO4 What are the coefficients for each of the following formulas? What if the reactant has no coefficient? What information does the coefficient give you?

2NaOH 8H2 4Ag O2  8H2SO4 What are the coefficients for each of the following formulas? What if the reactant has no coefficient? Then we assume it is “1” e) 1O2  What information does the coefficient tell you? How many reactant molecules are present in the reaction

Pure substances are composed of only one type of substance. Elements and compounds are pure substances. Every particle of an element or compound is identical…..PURE! Mixtures are not pure, they are physical combinations of different elements and compounds.

What Are The Relationships Between Atom, Element, Molecule, Ion, Compound And Mixture?

Element? you cannot divide an element into simpler parts using natural processes. A union? compounds are broken down into simpler parts by chemical reactions H2O  H2 + O2 Mixture? since they are physically combined, you can use the physical properties of different components to separate the parts of the mixture.

Sieving – uses size differences to separate components filtering – uses very small pores in the filter to separate components. It is often used in conjunction with solubility distillation – the evaporation and condensation of different parts of a mixture. Differences in boiling points are used. Physical properties used: magnetism – to separate iron filings solubility melting and boiling points

To make this website work, we register user data and share it with processors. To use this website, you must agree to our Privacy Policy, including our Cookie Policy. Elements, compounds and mixtures. What are the main differences? Element Any substance that contains only one type of atom Cannot be broken down Compound.

Presentation on theme: “Elements, compounds, and mixtures. What are the main differences? Element Any substance that contains only one type of atom. Cannot be broken down. Compound.”— Presentation transcript:

Elements, Compounds, Mixture (answer Key)

2 What are the main differences? Element Any substance that contains only one type of atom Cannot be broken down Compound Made up of atoms of two or more different elements Can be broken down Mixture Made up of two or more different elements/compounds Can be separated

3 What is an element? A pure substance Consists of one kind of atom (the smallest unit) Homogeneous in structure Cannot be decomposed or separated Identified by a chemical symbol (eg C) Classified as a metal, non-metal or metalloid Examples: Hydrogen, Helium, Oxygen, Carbon, sodium, etc.

5 What is a compound? Is a pure substance Consists of 2 or more types of elements Has a homogeneous structure Cannot be broken down or separated by physical means The smallest unit is a molecule Identified by a chemical formula (H 2 O) Created by chemical change Held together by a chemical bond Examples: sugar, rust, water, carbon dioxide

6 What is a mixture? Not a pure substance Consists of 2 or more types of elements Can be broken down or separated by physical means Smallest unit is a molecule Identified by the constituents in it Contains Classified as homogeneous or heterogeneous Physically held together without chemical bonds Examples: Sugar water, blood, granite, cereal with milk, granola bar

Grade 9 Science Olympiad

7 types of mixtures Homogeneous Evenly mixed at the atomic/molecular level Parts do not appear separate Difficult to separate Examples: Air (includes N 2 , O 2 , H 2 O , CO 2 ), Blood (includes red blood cells, white blood cells, plasma and platelets) Heterogeneous Not evenly mixed at the atomic/molecular level Parts appear separate Easy to disassemble Examples: Salt and pepper, chocolate chip cookies

8 Practice Classify the following as an element, compound or mixture (heterogeneous or homogeneous) Carbon = Hydrogen = Oxygen = Sugar (C 12 H 22 O 11 )= Sugar Water that is completely mixed = Sugar Water with sugar on the bottom =

9 Practice Classify the following as an element, compound or mixture (heterogeneous or homogeneous) Carbon = Element Hydrogen = Element Oxygen = Element Sugar (C 12 H 22 O 11 )= Compound Sugar Water that is completely mixed = Homogeneous mixture Sugar Water with sugar in bottom = heterogeneous mixture

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Elements, Compounds, And Mixtures Help Please. Use The Picture.

To make this website work, we register user data and share it with processors. To use this website, you must agree to our Privacy Policy, including our Cookie Policy. Water is important to life, weather and many processes. Although it is elemental to our existence, is water an element? Scientists classify water as a compound, not an element. Here’s how it works.

An element is a substance made up of one type of atom. Hydrogen (element symbol H) and oxygen (element symbol O) are examples of elements. You may have heard water called “H2O”. The name refers to the chemical formula of water H

Before people knew about atoms and molecules, water was considered an element. Other “elements” include fire, earth, air, and sometimes metal, wood, or spirit. Some traditional practices still consider water an element, but this is different from the scientific definition.

When two atoms form a chemical bond, they form a molecule. Hydrogen and oxygen are elements, but they also usually exist as molecules consisting of two atoms (H

What Are Examples Of Pure Substances?

Water is also a compound. Sometimes people use the terms “molecule” and “compound” interchangeably, but chemists distinguish between them. A molecule occurs when two or more atoms form chemical bonds, while a compound occurs when two or more

Atoms form chemical bonds. Under this narrow definition, oxygen and hydrogen are molecules, but not compounds. Water is both a molecule and a compound.

Another common question is whether water is a mixture. The thinking is that since water is made up of a combination of hydrogen and oxygen atoms, it must be a mixture. However, scientists define a mixture as a material produced when two substances are physically combined. If you release gas from a hydrogen cylinder and oxygen bottles into space, you get a mixture of hydrogen and oxygen molecules. You don’t get water because the result is just a physical combination of hydrogen and oxygen. If you add enough energy to the mixture of hydrogen and oxygen, a chemical reaction (chemical combination) occurs that makes water. Water is a pure substance, not a mixture. There are billions of materials on Earth. All these materials are composed of only about 100 elements. Elements are formed from only one type of atom. Compounds are formed from two or more different species

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