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Observations and Inferences - Understanding the Mass of a Substance

In this Bellringer, we explore the concept of observations and inferences, and apply it to determine the mass of a substance. We also review density and prepare for an upcoming test on scientific methods, graphing, and measurement.

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Observations and Inferences - Understanding the Mass of a Substance

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  1. August 31, 2011 Bellringer: Place in your Homework A 10 ml sample of a substance has a mass of 20 g. What would be the mass of a 100 ml sample of the same substance?

  2. Objectives: Determine the difference between an observation and inference Agenda Go over Density Worksheet Observation/Inference notes Mr. Peanut activity Review for test Homework: Turn in Measurement lab Study for test

  3. Observations • recognizing and noting some FACT to gather information about the world

  4. You make observations using your five senses • Sight - Detects color, size, and shape. • Hearing - Reaction to moving air • Taste - Sweet, salty, bitter, sour. • Smell - Reaction to gases. • Touch - Reaction to pressure, temperature. • We are not sensitive enough to detect high sounds or radio waves.

  5. Observations must be specific and accurate, not relative, so that it means the same to everyone. • Example: • Incorrect - the burning bag smelled nasty • Correct - the burning bag smelled similar to rotten eggs

  6. Inference • a possible explanation or guess about an observation • Example: you leave the movie theater and see the ground is wet so you infer that it rained.

  7. Look at the picture below and write three observations and two inferences

  8. Mr. Peanut • Wait for directions • When making observations be as specific as possible!

  9. Review for Test • http://sciencereviewgames.com/srg/subjects/nos.php

  10. Ticket out the Door • Make three flashcards to begin studying for tomorrow’s test! • Reminder: • Test is Tomorrow • Topics include: • Scientific method • Graphing • Measurement • Density • Observation/inference

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