Big Idea: Matter is descried by its properties and may undergo changes Unit 1 Lesson 4 Pure Substances and Mixtures Essential Question: How do pure substances and mixtures compare? Copyright Houghton Mifflin Harcourt Publishing Company
Unit 1 Lesson 4 Pure Substances and Mixtures P52-53 A Great Combination How can matter be classified? Matter is made up of basic ingredients known as atoms. An atom is the smallest unit of an element that maintains the properties of that element. Substances are classified as elements, compounds, and mixtures. Basic ingredients of all stuff Substances are classified as: Matter Elements Compounds Mixtures #5) Compare Elements, compounds and mixtures are all made up of atoms
Unit 1 Lesson 4 Pure Substances and Mixtures P53 How can matter be classified? An atom is a building block of matter An element is made of only one kind of atom. A compound is made up of different kinds of atoms that are chemically combined. A mixture contains a variety of elements and compounds that are not chemically combined. Air
Unit 1 Lesson 4 Pure Substances and Mixtures How can matter be classified? Is water an element, a compound, or a mixture? compound Visualize it #7 2 different colors represent 2 different types of atoms
Unit 1 Lesson 4 Pure Substances and Mixtures P52-53
Unit 1 Lesson 4 Pure Substances and Mixtures P54-55 Pure Genius What are pure substances? A pure substance is a substance with definite physical and chemical properties. Pure substances are made up of just one type of particle. Element and Compounds are Pure substances The atoms that make up copper are all the same Water molecules are made up of two different types of atoms that are joined together. The molecules that make up water are all the same
Unit 1 Lesson 4 Pure Substances and Mixtures P54-55 Pure Genius What are pure substances? Physical changes such as melting, freezing, cutting, or smashing do not change the identity of pure substances. When a pure substance undergoes a chemical change, it is no longer that same substance. The Chemical bonds that hold the atoms together are broken. A new substance is formed.
Unit 1 Lesson 4 Pure Substances and Mixtures Made of atoms Pure Substance
Unit 1 Lesson 4 Pure Substances and Mixtures P56 Classified Information How can elements be classified? Elements are classified as metals, nonmetals, or metalloids. Classifying elements helps scientists predict the properties of elements. The periodic table is a tool used to classify and identify elements that have similar properties.
Unit 1 Lesson 4 Pure Substances and Mixtures How can compounds be classified? P57 Compounds can be classified as acidic, basic, or neutral by measuring ph. Pure water (Neutral) has a ph of 7 Acids have a ph below 7. Blue litmus paper turns red in the presence of an acid. Bases have a ph above 7. Red litmus paper turns blue in the presence of a base.
- Describing Acids and Bases Properties of Acids and Bases Litmus is an example of an indicator, a compound that changes color when in contact with an acid or a base. Online Activity
Unit 1 Lesson 4 Pure Substances and Mixtures How can compounds be classified? Compounds can be organic or inorganic. P57 Organic compounds are those that contain carbon and hydrogen. Organic compounds made by living things are called biochemicals. Carbohydrates, lipids, proteins, and nucleic acids are biochemical compounds.
Unit 1 Lesson 4 Pure Substances and Mixtures P58 Mix and Match What are mixtures? A mixture is a combination of two or more substances that are combined physically but not chemically. Mixtures are not pure substances and do not have definite properties. Substances within a mixture keep their identities and individual properties. Mixtures can be separated by physical changes, although some mixtures are difficult to separate. Magnets, centrifuges, filters, and other materials can be used to separate mixtures.
14) Visualize A) Sand and salt are poured into a single beaker. The result is a mixture because B) When water is added to the sand-salt mixture, C) When the liquid is poured through a filter, D) The remaining salt water is heated until They are not chemically combined Salt dissolves in water. Sand does not. (solubility) Salt water passes through the filter Water is boiled off (evaporated) leaving salt behind 15) Devise Pick out the rocks by hand. Sort by size
Unit 1 Lesson 4 Pure Substances and Mixtures
Unit 1 Lesson 4 Pure Substances and Mixtures P60 Simple Solution How can mixtures be classified? A heterogeneous mixture is one that does not have a uniform composition. homogeneous A homogeneous mixture has the same composition throughout.
Unit 1 Lesson 4 Pure Substances and Mixtures P60 How can mixtures be classified? A suspension is a heterogeneous mixture. Particles in a suspension are spread throughout a liquid or gas, but are too large to stay mixed unless shaken or stirred. Particles settle in suspensions. A solution is a homogeneous mixture in which one substance is dissolved in another substance. Colloids have particles that are unevenly spread throughout the mixture. (looks homogenous but really heterogeneous) particles in colloids are too small to settle out of the mixture.
A substance that has definite physical and chemical properties. Mixture Compound 2 or more atoms chemically combined Heterogeneous Same throughout (Uniform) Between solution and suspension Solution One substance dissolved in another
Matter Pure Substances Mixtures Elements Compounds Heterogeneous Homogenous Metals ph Organic or inorganic Role in the body Suspensions Colloids Solutions Nonmetals Metalloids Acid <7 Blue litmus turns red Base >7 Red litmus turns blue Biochemicals Carbohydrates Lipids Proteins Particles are spread throughout too large to stay mixed unless shaken or stirred Particles settle particles that are unevenly spread throughout particles in colloids are too small to settle out of the mixture one substance is dissolved in another substance Nucleic acids