Worksheet 1a Answer Key PDF

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Worksheet 1

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1. List the steps in the scientific method. 1. Observation (Scientific Laws) 2. Hypothesis 3. Experiment 4. Model (Theory) 2. What is a hypothesis? Possible explanation for observations 3. How does a qualitative observation differ from a quantitative observation? Qualitative observation is based on utilization of our senses. Quantitative observation is based on utilization of measuring devices. 4. Give examples of application of a scientific method Observation—The statue is green Hypothesis—The statue is made of copper Experimentation—Does the material behave like copper when common tests are performed? If the results of experimentation support the hypothesis, it becomes a theory 5. When a theory could become a Law A law is a theory with broad experimental support. A statement that summarizes experimental facts about nature where behavior is consistent and has no known exceptions. 6. Give some examples of Field using Chemistry, explain how chemistry has been used. Biology, Physics, Geology, Meteorology, Environmental Science Engineering, Medicine, Pharmacy, Metallurgy, Agriculture Transportation, Military Science, Culinary Arts 7. What does Chemistry really teach? Ask questions, Seek answers, Properties of materials, Interactions of materials 8. Give examples of type of chemicals used in your house:

9. Give examples of Natural chemicals and Synthetic chemicals. Natural: Plant sources…………. Animal Sources:………………. Mineral Sources:………………. Synthetic: Medicines:………….. Plastics:……………………….. Fibers:…………………….. 10. List some benefits and some risks associated with chemical compounds. Benefits of Chemical Compounds: Save lives through medicines Provide energy and building material in food Materials that make life easier.

Risks: Side effects of medicines Pollution from the use of chemicals Some are very toxic 1

11. Define Matter Anything that has mass and takes up space (volume) 12.Define Chemistry Is the science that studies matter and all its changes. 13. Explain the difference between Intensive and Extensive properties Intensive properties – Properties that do not depend on the amount of substance:  Melting point  Boiling point  Color  Flammability  Reactivity  Conductivity  Physical State (solid, liquid, gas) Extensive properties – Properties that depend on the amount of material present:  Mass  Volume  Length  Moles  Weight  Total amount of heat given off in combustion

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