She was a Justice of the Peace. Do Now: Brain Teasers A woman from Washington married twenty different men from that city, yet she was not arrested for breaking the law. The most surprising fact is that she never divorced and none of these men died. How was this possible? Can you guess the next three letters in the following series and why? C Y G T N T L I T F......... What can you hold without ever touching or using your hands? She was a Justice of the Peace. S, A, W …. Each letter is the first letter of every word in the Sentence. Your Breath

Announcements Homework: Achieve 3000 – due on March 25 Give up Oil? Not so Fast! A new Space Plan Finish Compound Concept map Chapter 16 Vocabulary – Word+definition+picture

Science Spot Light Pressure Review

Classroom Objective Title: Elements, atoms, and compounds L.O. Students will understand what atoms, elements, and compounds are and how they are related. (Notes)

Review State of Matter can be used to describe physical properties. For example, water can be a solid (ice) or a liquid (liquid water), or a gas (evaporation).

Review A chemical property of iron is that it will slowly combine with oxygen in the air to form a different substance, rust.

Elements What is an Element? An element is a pure substance that cannot be broken down into any other substances by chemical or physical means. Elements are the simplest substances.

Atoms What is an Atom? An atom is the basic particle from which all elements are made. Atoms have a positive center (nucleus) surrounded by a negatively charged cloud.

When Atoms Combine Atoms of most elements have the ability to combine with other atoms. Atoms combine to form larger particles called molecules - groups of two or more atoms held together by chemical bonds. A Chemical bond is a force of attraction between two atoms.

Molecule Example For example think of the atoms hydrogen (H) and oxygen (O). Alone, the are colorless, odorless, gasses. When combined, they form a water molecule. H O H₂O O H H

Concept Maps + Element Molecule Oxygen Oxygen O O₂ Element Oxygen O Atom Negative electron cloud Positive Nucleus Atom Negative electron cloud Positive Nucleus

Compounds Most elements in nature are found combined to other elements. A compound is a pure substance made of two or more different elements chemically combined in a set ratio. A compound may be represented by a chemical formula, which shows the elements in the compound and the ratio of atoms. For example: H₂O The ratio of hydrogen atoms to oxygen atoms is 2 to 1.

Compounds When elements are chemically combined, they form compounds having properties that are different from those of the uncombined elements. For example: Calcium (solid) + Carbon (solid) + Oxygen (gas) = Calcium Carbonate

Concept Maps + + Compound Element Calcium Ca Carbonate CaCO3 Element Atom + Negative electron cloud Positive Nucleus Atom Atom Negative electron cloud Negative electron cloud Positive Nucleus Positive Nucleus

Video – Snails Compounds

In your notebook Concept Map Summary Draw a concept map that relates atoms, elements, and molecules (or compounds). Include the definitions for elements, atoms, molecules, and compounds. Include a picture sketch or description of your molecule (or compound) Example: Calcium Carbonate