Elements, Mixtures, and Compounds

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Presentation transcript:

Elements, Mixtures, and Compounds

Mixtures A mixture is a combination of different substances that remain the same individual substances and can be separated by physical means. (copy into notes) Example of a mixture: fruit salad containing apples, oranges, bananas, and strawberries. You can pick out the apples from the mixture or any other fruit by pulling it out of the bowl!

Pure Substances Matter can be pure or it can be two or more substances mixed together. (copy into notes) A pure substance has only one type of component; for example, pure water contains only water molecules. (copy into notes) Pure water, pure sugar, and pure baking soda!

Quiz Time (Answer in notes) What is the difference between a mixture and a pure substance? How are mixtures separated? Give an example of a mixture from your daily life!

Elements An element is a substance that contains only a single type of atom. (copy into notes) The number of atoms is not important as long as all of the atoms are of the same type. (copy into notes) You CANNOT separate an element into other substance. There are more than 100 elements! (copy into notes)

Molecules When two or more atoms bond together, or combine chemically, they make a particle called a molecule. (copy into notes) A molecule is a group of atoms held together by a specific type of chemical bond so that they move together as a single unit. (copy into notes) Molecules can be made up of the same type of atoms or different types of atoms. (copy into notes)

Types of Molecules A water molecule has 2 hydrogen atoms and 1 oxygen atoms (copy into notes) A hydrogen gas molecule has 2 hydrogen atoms bonded together (copy into notes) An oxygen gas molecule has 2 oxygen atoms bonded together (copy into notes)

Compounds A compound is a substance that consists of two or more different types of atoms that are bonded together. A compound can have very different properties from the individual elements that make up the compound! Compounds are separated by breaking the bonds between the elements and CANNOT be separated by physical means.

Quiz Time (answer in notes) How are molecules formed? How do you separate molecules? How do you separate elements? How are compounds separated?