Chapter 2 science powerpoint
- 1. Chapter 2 By: Jackson Gillespie
- 2. Law of Conservation of Mass • The Law of Conservation of Mass states that: In a closed sytstem, matter can never be created or destroyed. It can only change forms.
- 3. Measurements • Volume: Length x Width x Height (mL) • Mass: Grams (Triple Beam Balance) • Density: (g/mL)
- 4. Safety In the Lab • Always wear safety goggles during all experiments • No horseplay in the lab • Long hair must be pulled back; no baggy clothes that could catch light (ex: scarves) • Follow rules and be cautious
- 5. Measurements Used to Determine Temperature • Kelvin: boiling point (337) freezing point (237) • Celsius: boiling point (100) freezing point (0) • Fahrenheit: freezing point (36)
- 6. Labs • Oobleck Lab • Mass of Sugar in Water Lab • Mass of Ice and Water Lab • True Volume of Sand
- 7. Qualitative Vs. Quantitative • Qualitative data is data that cannot be measured with a number. It is based solely off of observation. • Quantitative data is data that is measured or calculated using numbers. Not an Observation.
- 8. Distillation • Distillation-a process that is used to separate substances in a solution based on their individual Boiling Points. • Distillation is when a solution is heated up and one substance in the solution evaporates leaving you with a pure substance or element.
- 9. Filtration • Filtration-a process that is used to separate materials in a mixture by the size of their particles or solubility. • Filtration was used in the separation of salt and sulfur lab when we poured the mixture with water through coffee paper into an Erlenmeyer Flask
- 10. Evaporation • Evaporation-a process that is used to isolate a solid that is dissolved in a liquid. • Evaporation occurs when a liquid sits out for a while and is exposed to mild temperatures. For instance, evaporation occurs when you leave a glass of water in the sun for a period of time.
- 11. Reactivity • Reactivity is the property that describes how readily a substance combines chemically with other substances.
- 12. Flammability • Flammability is the property that tests a material’s ability to burn in the presence of Oxygen.
- 13. Evidence of a Chemical Change • A change in color has occurred • A gas has been produced • A precipitate has formed • To determine whether or not a chemical change has occurred ask this question: Are different substances present after the change has occurred?
- 14. Review Question One • How would you tell the difference between a Homogenous Mixture and a Heterogenous Mixture?
- 15. Review Question Two • What happens when a Physical Change occurs? What happens when a Chemical Change occurs?
- 16. Review Question Three • Explain the process of Distillation and Filtration. Be as specific as possible.
- 17. Review Question Four • Number the following Substance in order of density from Highest to Lowest. • Hydrogen Peroxide • Corn Starch • Dish Soap • Extra Virgin Olive Oil
- 18. Review Question Five • How would you separate a mixture of Ethanol and Hydrogen Peroxide using the process of Distillation? Be as specific as possible.