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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

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

### 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