Chemistry Review. Atoms/Elements/Molecules What is the difference between an atom and an element? What is the difference between an element and a compound/molecule?

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Presentation transcript:

Chemistry Review

Atoms/Elements/Molecules What is the difference between an atom and an element? What is the difference between an element and a compound/molecule? What is an example of an element?

Matter What are the 3 states of matter? SOLID, LIQUID, GAS Animation

Phase Changes

Properties What is a property? Describes, talks about it’s ability to… Can be physical or chemical Physical property: characteristic/ability of a substance without changing it to something new Chemical property: characteristic of a substance that does has the ability to turn into something new

Physical & Chemical Characteristics PHYSICALCHEMICAL Changes its appearance physically Changes what it is made up of (can change the atoms to make a new thing); reacts

Examples of Properties Front Desk: PHYSICAL PROPERTIESCHEMICAL PROPERTIES Color Flammable Hardness Could change color if burned Ability to break Melting point of plastic Not flexible Not magnetic Texture

9/11 – notes stop here

9/17 Notes startChanges When it actually changes Physical: changes size, shape, color but its still the same thing Chemical: changes what it completely is, chemical reactions

Examples of changes Tearing paper Burning paper Breaking wood Campfire Mixing kool aid Cooking a cake Physical change Chemical change

Property vs. Change Property = description or could change in the future Change = change 5 evidences of a chemical change PCOGT – “Pirates can obtain great treasures” – Precipitate (solid forms) – Color change – Odor(smell) – Gas forms – Temperature change – Evidence of a chemical change Evidence of a chemical change –

Property or Change? Boiling point 2 different liquids mix  bubbles Food coloring in water Burning an egg It has a yellow color It produced a smell Property Change

Which of the following is an example of a chemical property of water? – A. Boils at 100 C – B. Is transparent – C. Has no odor – D. Reacts with calcium Is it still water (H2O) Transparent = see through/clear No smell Reacts = chemical reaction

Which of the following is an example of a physical property of hydrogen? It A. Is less dense than air B. Reacts with oxygen C. Is highly flammable D. Forms hydrochloric acid PHYSICAL PROPERTY

Energy that can be given off in a chemical reaction 3 different kinds Substance gets warmer? HEAT ENERGY Changes color? LIGHT ENERGY Creates a noise? SOUND ENERGY

Common Chemical reactions Respiration Rust Photosynthesis Combustion: 2 chemicals burning

How can you speed up a chemical reaction? Add heat Stir Crush

Don’t freak out Take your time Use tools Read the entire question Look at the graphs and tables