Science Homework Due : Friday, September 7, 2012

1. Science Homework Due: Friday, September 7, 2012 Name: ____________________________________ Teacher: _____________________ Period: ____ Part I: Review of Lab Safety Instructions: Draw a line that matches each safety tool with its correct function. Goggles Fire Blanket Gloves Fire Extinguisher Eye Wash and Shower Station Apron Use it to put out medium to large fires. Remember to pull pin first Wear these to protect your hands from dangerous chemicals Wear this to protect your body from dangerous chemicals It protects your eyes from chemicals and sharp objects This can be used to wash chemicals off your body or eyes. Use it to put out small fires or fires on persons. Part II: Vocabulary Define the following terms: 1. OBSERVATION: 2. INFERENCE: 3. HYPOTHESIS: 4. VARIABLE: 5. INDEPENDENT VARIABLE: 6. DEPENDENT VARIABLE: 7. COMPARE:

2. Science Homework Due: Friday, September 7, 2012 Name: ____________________________________ Teacher: _____________________ Period: ____ • Part III: Scientific Investigations • Review: Read the definitions for each type of investigation below. • Descriptive Investigation: A descriptive investigation is used to describe or characterize one object or organism. You can use your 5 senses (eye sight, touch, hearing, smell, and taste) and you can use different tools like a ruler, tribe beam balance, or thermometer. • Comparative Investigation: A comparative investigation is similar to a descriptive investigation except that you are describing two or more things and listing the similarities and differences between them. Again, you may use your 5 senses and other scientific instruments. • Experimental Investigation: When you perform an experimental investigation, you change one variable (the independent variable) to see how it affects or changes another variable (the dependent variable). Also, before beginning an experimental investigation, you should write a hypothesis. Instructions: Use the definitions above to identify each investigation below as either a descriptive, comparative, or experimental investigation. Circle the correct symbol next to each investigation, and underline the sentence that helped you pick your answer. Investigation I: Yesterday, Cesar was outside playing near some rocks and saw two lizards: a Texas-spiny lizard and a Texas-horned lizard. He observed that their heads were very different. He took a picture of both lizards’ heads and listed all the similarities and differences between them. Investigation II: Stephanie is planting flowers in her garden to attract butterflies. She is not sure which flower will attract the most butterflies, so she plants 4 different kinds. She records the number of visit by butterflies to each flower and chooses one to plant in her garden. Investigation III: Ofelia is interested in knowing the average mass of a cardinal’s egg. During one week, she visits 10 cardinals’ nests and measures the mass of all the eggs in the nest using a triple beam balance. She determines that the average mass of a cardinal egg is 8.6 grams. Texas-Horned Lizard Texas-Spiny Lizard