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Safety review

Dive into the fundamental concepts of life with this engaging review of Chapter 1. Discover the characteristics of life, scientific processes, and tools of the trade. Test your knowledge with a vocabulary quiz and explore the chemistry of life in Chapter 2.

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Safety review

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  1. Safety review

  2. Chapter 1the science of Life

  3. Lets play a game… • Am I alive? • How can you tell?

  4. Characteristics of Life? • Organization • Response to stimuli • Homeostasis • metabolism • Growth and Development • Reproduction • Change through time

  5. Organization • High degree of order between internal and external parts • Interactions with the living world • Examples?

  6. Response to stimuli • Ability to respond to changing environment

  7. Homeostasis • ability to maintain a stable internal condition. • No matter the changes in environment.

  8. Metabolism • Use of energy to power life processes

  9. Growth and Development • Growth? • increase in amount of living material • Development? • process ending in adulhood • Ie. Frog

  10. Reproduction • Production of Offspring • Coded information is passed on to the offspring • Like Produces Like

  11. Change through time • evolution

  12. Science as a process • Scientific method • Organized approach to learn how the natural world works

  13. Scientific method • Observation / question: • Hypothesis: tries to answer question; proposed explanation • Prediction: guesses what will happen • Experiment: tests hypothesis • Collect and analyze data • Supports or disputes hypothesis

  14. Scientific theory • When a set of confirmed hypotheses is confirmed to be true many times • Examples?

  15. Tools of the trade • Microscopes 1. Compound light microscope • Uses light through a specimen • Electron microscpes use a stream of electrons to visualize a specimen 2. Scanning (SEM) electron microscope • 3-D surface view 3. Transmission (TEM) electron microscope • 2-D internal view

  16. Compound Light Microscope

  17. Scanning Electron Microscope SEM

  18. Transmission Electron Microscope TEM

  19. Light vs. Electron

  20. SEM or TEM SEM TEM TEM SEM

  21. SEM or TEM TEM SEM SEM TEM

  22. More SEM

  23. More SEM

  24. More SEM

  25. The Metric System • System of measuremnt in science. • Based on multiples of ten = easy conversion

  26. Ch 1 Vocab quiz next class • Biology • Compound light microscope • Electron microscope • Gene • Hypothesis • Metabolism • Metric system • Organization • Scientific method • Theory

  27. Ch 2Chemistry of Life

  28. Matter • Everything is made of matter (?) • Has mass and occupies space

  29. Elements and atoms • Element: substances that cannot be broken down into simpler substances • Atoms: smallest particle of an element that retains the properties of that element

  30. Atomic structure • Nucleus makes up most of mass of an atom • Consists of protons (positive) and neutrons (no charge) • Number of protons = atomic number • Number of protons + neutrons = mass number

  31. Atomic structure • Electrons: negatively charged particles • Balance out with positive charge of protons • Very small mass • Move around the nucleus in orbitals

  32. Isotopes • Atoms of same element have equal number of protons but not necessarily neutrons • Isotopes: atoms of the same element that have a different number of neutrons

  33. Compounds • Made of atoms of two or more elements • H2O • CO2 • CH4

  34. Covalent Bonds A Covalent Bond occurs when atoms share electrons

  35. Ionic Bonds Oppositely charged atoms, attracted to each other Note: they do not share electrons Example: Sodium Chloride

  36. Energy and Matter • Energy: ability to do work • Many types of energy • Electrical • Radiant (light) • Thermal (heat) • Chemical • mechanical

  37. Chemical reactions • One or more substances change to produce one or more different substances • Reactants: on the left side of the equation

  38. Chemical reactions • One or more substances change to produce one or more different substances • Products: on the right side of equation

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