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Nature of science

Nature of science. What does that mean ? Organizes knowledge in the form of testable explanations and predictions about the universe. What is yeast?. Vocabulary. Properties of matter Chemical change Physical change State of matter Control Salt Dissolve Yeast Particles

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Nature of science

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  1. Nature of science What does that mean? Organizes knowledge in the form of testable explanations and predictions about the universe

  2. What is yeast?

  3. Vocabulary • Properties of matter • Chemical change • Physical change • State of matter • Control • Salt • Dissolve • Yeast • Particles • Temperature • Thermometer

  4. Vocabulary • Mass • Atoms • Proton • Neutron • Electron • Elements • Molecules • Compounds • Mixtures • Solutions

  5. What are properties of matter? Properties = the characteristics of a substance • Mass = amount of matter in an object • Volume = amount of space an object takes up • Density = amount of mass in a given volume

  6. What are atoms? Protons and Neutrons are located at the nucleus (center) of the atom, while the electrons whiz around the nucleus. If an atom's nucleus was the size of the sun, the whole atom would be on a scale of 100 times the size of the solar system.

  7. What is the atomic theory? Energy & Matter make-up the universe mercury, mars, pluto, saturn, earth

  8. Atom Rap • Everything is made of matter. • Matter is made of elements. • An element cannot be chemically broken down into a simpler substance. • An atom is basic unit of a chemical element. • Atoms consist of protons (positive + the charge), electrons (negative - charge), neutrons (no charge)

  9. What are elements? Building blocks of every known material

  10. What are molecules? Molecules are made up of two or more atoms. Simplest molecule is hydrogen, H2

  11. What are compounds? Acompound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds.

  12. What are mixtures? • Can be mixed • But can be unmixed • Do not form a new substance

  13. What are solutions? • When mixed evenly can’t find substance • Example – sugar stirred in tea

  14. What is a Physical Property? • Physical property is any property that can be measured. For example: • Temperature • Density • Mass • Color • Hardness

  15. Can be measured

  16. Can be changed without pulling apart the substance

  17. What is a chemical property? Chemical properties can only be observed and measured by performing a chemical reaction

  18. Rocks Chemical Weathering Change in temperature

  19. Chemical weathering! Example: Nail turns rusty

  20. Different substance with new properties- Change is permanent!!

  21. What is conduction? transmission of energy: the passage of energy, particularly heat or electricity, through something

  22. What is convection? Convection is the concerted, collective movement of ensembles of molecules within fluids -- liquids, gasesand rheids. Convection of mass cannot take place in solids, mass can’t flow.

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