Elements and Compounds Created by Kesler Science – More 5E lessons at KeslerScience.com Presented by Kesler Science
Essential Questions: What is the difference between elements, compounds, and mixtures?
Elements and Compounds Dmitri Mendeleev Russian chemist and inventor Formulated the Periodic Law Arranged the periodic table by atomic weight and similar properties Predicted the properties of eight elements yet to be discovered
Quick Action – INB Template Cut the INB template out and glue along the narrow tabs into notebook. Fold each side back and add notes under each section. You will refer back to this page several times as you view this presentation. © KeslerScience.com
Elements and Compounds Matter Pure Substance Element Compound Mixture How is matter classified?
Elements and Compounds Matter Everything around you Anything that has mass and takes up space Atoms and molecules are all composed of matter. Can be solid, liquid, or gas
Elements and Compounds Solid Phase of Matter Has a definite volume and definite shape Molecules are tightly packed. Does not flow easily – particles cannot move/slide past one another © KeslerScience.com
Elements and Compounds Liquid Phase of Matter Has a definite volume but no definite shape Flows easily - particles can move past one another Lots of free space between particles Takes the shape of their containers © KeslerScience.com
Elements and Compounds Gas Phase of Matter Has no definite shape or definite volume Lots of free space between particles Flows easily - particles can move past one another Takes the shape and volume of its container. © KeslerScience.com
Elements and Compounds H H2 Compound H2O Pure Substance Has a definite and constant composition Can be either an element or a compound The composition of a pure substance doesn’t vary. Ex: salt or sugar © KeslerScience.com
Elements and Compounds Molecule 2 or more atoms bonded together Represents the smallest particle in a chemical compound that can take place in a chemical reaction. Has the same chemical properties of that element or compound. Some molecules consist of two atoms of the same element. Ex. O2 Other molecules consists of two or more atoms. Ex. (H2O) © KeslerScience.com
A pure substance that cannot be broken down into any other substance. Elements and Compounds Element A pure substance that cannot be broken down into any other substance. It is represented on the periodic table by a symbol. Ex: Au is Gold Au Au Au © KeslerScience.com
Quick Action – INB Template Cut the INB template out and glue along narrow tabs into notebook. Research using the web to find the most abundant elements percentage in Earth’s crust, Earth’s atmosphere, Earth’s oceans, and Earth’s living matter. Create pie charts to represent each. © KeslerScience.com
Quick Action – INB Template © KeslerScience.com
Elements and Compounds A pure substance formed when one or more elements have chemically combined through a chemical reaction to form a new substance It is represented by a formula. Ex: NaCl - Sodium Chloride (salt) Cl Na H H O © KeslerScience.com
Elements and Compounds Counting elements in a molecule Count the number of different capital letters or element symbols in the compound. Na2O 1 - Na 1 - O © KeslerScience.com
Quick Action – Elements and Compounds Get with your table and discuss how to count the number of different elements in a compound. Complete the chart by counting the elements and naming them. Formula # of different elements Name of elements H2O NaCl C6H12O6 NaOH © KeslerScience.com
Quick Action – INB Template Cut out the INB template and glue along the narrow tab. Looking at the formula, decide if it is a compound or an element. Name each element in the formula. © KeslerScience.com
A combination of many different elements Elements and Compounds Mixture A combination of many different elements Not chemically combined Can be separated Ex: Trail mix © KeslerScience.com
Check for Understanding Can you… Differentiate between elements, compounds, and mixtures? Clear up any confusion and answer questions. © KeslerScience.com