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Pre-class Activity 9/5

Pre-class Activity 9/5. Chemistry is the study of matter and the changes that it undergoes. What is matter? Be prepared to give two examples of matter that can be found in the classroom. Chemistry and Matter. Chemistry is the study of matter and the changes that it undergoes.

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Pre-class Activity 9/5

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  1. Pre-class Activity 9/5 Chemistry is the study of matter and the changes that it undergoes. What is matter? Be prepared to give two examples of matter that can be found in the classroom

  2. Chemistry and Matter Chemistry is the study ofmatter and the changes that it undergoes. Anything that hasmassand takes up space A measurement that reflects the amount of matter

  3. Questions What in the universe isn’t matter? Energy Why aren’t the terms mass and weight interchangeable? Weight is not only a measure of the amount of matter, but also a measure of the effect that gravity has on matter

  4. Scientific Method – A Systematic Approach Draw conclusions and revise hypothesis OBSERVATION HYPOTHESIS EXPERIMENT THEORY Theories are supported by many experiments

  5. Hot 300o Observations Qualitative vs. Quantitative Temperature Height Mass Length

  6. Pre-class Activity 9/8 A scientist owns fish that are very sensitive to changes in temperature. One morning, after a huge storm, he came into the lab only to find that all the fish in his tank were dead. He suspected that there might have been a power outage due to the storm, in which the power to the heater may have been interrupted. To test this, he measured the temperature of the tank, only to find that it is normal. Identify the observation, hypothesis and experiment in the paragraph above. Does the result of the experiment support the hypothesis? Homework: Read Scientific Method and the Milk Lab, continue with HW assignments 1,2,3. Homework Assessment #1 – Wednesday 9/10

  7. Mrs. Pav’s Milk Lab Write-Up Pupose: To determine if the type of milk affects the migration time of food coloring in the milk experiment Hypothesis: If whole milk is substituted for skim milk in the milk experiment, the food coloring will migrate slower. Materials: In addition to materials listed for the milk lab, whole milk was added Procedure: Refer to written procedure for the milk lab. The migration time of food coloring was measured by using a stop watch to record the time that it took for the food coloring to migrate to the edge of the petri dish. Results: The time for the control (skim milk) was 4.8 seconds. The time for the experimental group (whole milk) was 3.2 seconds. Conclusions: The hypothesis was confirmed by the data because the migration time of food coloring increased for whole milk as compared to skim milk

  8. Experiments A set of controlled observations that test a hypothesis. Key Terms Variable: A quantity or condition that can have more than one value Independent Variable: A variable that is changed by the investigator in an experiment Dependent Variable: A variable the changes in response to the independent variable Control: A standard for comparison

  9. Respiration Rate Temp (oC) Experimental Design Example The Effect of Temperature on the Respiration Rate ofFish What is the dependent variable? What is the independent variable? What would be an appropriate control? What is the relationship between respiration rate and Temperature?

  10. Theory vs. Scientific Law Theories areexplanationsthat are supported by many experiments Scientific Law describes a relationship in nature that is supported by many experiments

  11. Pure vs. Applied Research Gaining knowledge for the sake of knowledge Vs. Gaining knowledge to solve a specific problem

  12. TOP 3 CHOICES FOR LAB PARTNERS

  13. SOMEONE TO WORK WELL WITH • COOPERATIVE • CONSCIENCIOUS • RELIABLE

  14. SOMEONE TO DO ALL THE WORK • CONSCIENCIOUS • RELIABLE • A SUCKER

  15. SOMEONE TO GOOF OFF WITH • DEVIANT • MISCHIEVIOUS • STAYING AFTER SCHOOL TO WASH GLASSWARE

  16. CREDITS DIRECTION AND PHOTOGRAPHY……………MRS. PAV SCIENTIST, SLACKER AND MISCHIEF MONKEY #1………………………….GARCIA PAV SCIENTIST, SUCKER AND MISCHIEF MONKEY #2…………………………OLIVIA PAV

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