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# Oh Wow…We need a review - PowerPoint PPT Presentation

Try These: How many Sig Figs in the following? .00234 20,002 29,000 2.3000 Solve 12.1012cm + 20.234cm + 11.12cm= 2.345cm X 11.023cmX.0023. Oh Wow…We need a review. Homogeneous Mixture-something consistent throughout Ex: Salt water

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## Oh Wow…We need a review

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### Try These:How many Sig Figs in the following?.0023420,00229,0002.3000Solve12.1012cm + 20.234cm + 11.12cm=2.345cm X 11.023cmX.0023

Oh Wow…We need a review
• Homogeneous Mixture-something consistent throughout Ex: Salt water
• Heterogeneous-Mixed composition throughout Ex: Alphabet soup, Sample of Dirt
• Element- Basic Building Block (See Periodic Table) Ex: N,I,O
• Compound-composed of elements
• Ex: CO2
• Pure substance can’t be separated with out a change of composition (O2, NaCl (salt), H2O) can be elements or compounds
How does significant digits relate to tools in science?
• Significant Digits show how precise a tool is
• Precision is How close measurements are to each other
• This is different than accuracy which is how close you are to the correct answer
Explain what a precise dart player would look like. How would this compare to an accurate player?
What does it mean Control a procedure?
• In a controlled experiment everything is the same except for the manipulated variable
How does this relate to an experimental control?
• An experimental control determines if the environment has any affect on the data
You will design an experiment to determine the affect of temperature on Reaction Rate
• Available Materials
• Beakers, Ice, Water, 3 polident tablets, graduated cylinders