Properties of Compounds By Anirudh and Mihir

Table of Contents Summary of Lesson Vocabulary Physical Property Chemical Property Density Melting Point Boiling Point Solubility Conductivity Beyond the Book Compound Factz F Pop Quiz Pop Quiz Cont. Thanks for Watching

Summary of Lesson

Main Idea Physical and chemical properties are characteristics used to describe, identify, and classify matter. The measure of how much of one substance can dissolve in another is called solubility. Copper wire conducts electricity well; plastic insulation does not. People use physical properties, including electrical conductivity, to make useful products and separate mixtures.

Vocabulary Physical Property: any characteristic of matter that can be measured or detected by the senses Chemical Property: the ability or tendency of a material to change its chemical makeup Density: the mass per unit volume of a material Melting Point: the temperature at which a solid substance changes to a liquid

Vocabulary Cont. Boiling Point: the temperature at which enough energy is added to a liquid to change it into a gas Solubility: the measure of how much of one substance can dissolve in another Conductivity: a material’s ability to carry heat or electricity

Physical Properties A physical property is one kind of property; the other is chemical property. A physical property can be measured or detected by the senses. Examples of physical properties are color, shape, size, mass, volume, length, and odor. Matter is often defined as anything that has mass and volume.

Chemical Property A chemical property is the ability or tendency of a material to change its chemical makeup. When the arrangement of atoms or molecules changes, a new material is formed. Examples of chemical properties are burning sugar. It becomes caramel. Tasty!!!! Burning would be a chemical change.

Density The density of a material is its mass per unit volume. All samples of a pure substances kept under the same conditions have the same density. Density is not the same as mass. Ex: a bottle filled with plastic foam will float because foam is less dense than wat-ah. Ex2: a bottle filled with sand will sink because sand is denser than wat-ah

Melting Point When enough energy is added to a solid, it melts to form a liquid. The temperature at which a solid substance change to a liquid is called its melting point. When enough energy is removed from a liquid, it freezes to form a solid. The melting point for wat-ah is 0 degrees Celsius and gold’s is 1940 degrees Fahrenheit.

Boiling Point When enough energy is added to a liquid, it changes into a gas. The temperature at which this happens is called the boiling point. Boiling point can also be used to identify a substance. Wat-ah and alcohol are colorless liquid but their boiling points are different at sea level.

Solubility The measure of how much substance can dissolve in another is called solubility. Solubility is another physical property of matter. Solubility can be used to separating substances. Ex: If you add alcohol to a to a mixture of salt and sugar, only the sugar will dissolve

Conductivity The conductivity of a material is its ability to carry energy. Most metals are good conductors of heat and energy. Materials that have a low conductivity are used to insulate conductivity. You should never use a current-carrying electrical chord that has frayed insulation.

Beyond the Book

Compound Factz There are certain proportions for the elements that make up a chemical compound that are in direct ratios. Also, compounds that are made up of isotopes, elements that have the same number of protons and neutrons, of an element may have different size ratios than compounds made up of the element.

Beyond the Book All compounds are made of more than one element. For example, water’s chemical makeup is H20 which makes it a compound. Compounds with molecules are made when the atoms of the elements that are held together with bonds.

Pop Quiz Which one of these is an example of a physical property? A) Boogar Picar B) Yellow barney C) color D) dsghbawkgaturkbjrk Burning is an example of ________ ________. A) Spongebob Squarepants B) physical property C) gnarly toe D) chemical property

Pop Quiz Is density the same as mass? A) oh yaaaah B) maybe C) no! D) Me not know What is the melting point for gold in Fahrenheit? A) 0 B) 1940 C) 1,234,567,890 D) -8,903,489,038,490,348

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