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I was testing if I put a clean jar over a candle or a unclean jar would the unclean jar last longer. I put a clean jar over a candle to see if it would last longer or shorter than a unclean jar. My control is the clean jar my variable is. I have learned that a clean jar will let the candle burn longer than the unclean jar.
My hypothesis was if a washed jar a washed jar are placed over a burning candle the washed  jar will let the candle burn longer. My hypothesis was correct because the clean jar let the candle burn longer. The one pattern I noticed was the flame turned blue at the end of each test. I discovered that the clean jar will last longer than the unwashed jar.
A possible source of error is that the jar didn't seal all the way. The jar couldn't have sealed all the way. The candle burned longer that test. Understanding errors is important so you can avoid them.
This experiment shows that the unwashed jar has more co2 in it than a unwashed jar. This is important because in the real world we need o2 to live and plants need co2. I chose this test because it seemed like the most fun. Learning the co2 and o2 cycle is significant because we will take that withus for the rest of our lives.

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Control                            Trial 1 The flame lasted longer than I thought it would and it turned blue at the end.
Trial 2 The flame turned almost clear near the time it went out.
Trial 3 The inside of the jar turned a suit black color.
Variable
Trial 1 lasted almost 10 seconds less than the first test.
Trial 2 The jar started to become hard to see into  because the suit in the jar.
Trial 3 the top of the jar was hot to the touch.

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Untitled infographic by Karis HuberKantola - Infogram

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Plants and animals need each other to survive because the breath they breath  out is the breath the other one breathes in. So they could not live without each other.
Fire needs o2 to burn and it gives off co2. You could deminstrate this by putting  a candle under a jar. You will find that the candle goes out because itis drowned in co2 .
Joseph Priestly was the man that found the co2 o2 cycle. He found out by putting mice in a sealed jar. He found that they would die after awhile. so he decided to put a plant in with the mouse and he found it lived longer because plants give off  O2 and we breath in O2.

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If a washed jar or an unwashed jar are placed over a lit candle then the washed jar will create a longer flame time.

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14 Use match to relight the candle placed on the clay Caution: remember fore safety
15 Shake or blow out the match and place the match in the petri dish
3 don't wash out the jar and leave it dirty this is the variable.
16 Quickly place the jar upside down over the clay and press into clay to seal 17 At the same time start the stop watch Note:relight and try again if the flame goes out
18 Make observations record in observation section
19 Time until flame goes out record time in seconds in data table
20 Repeat steps 14 threw 19 two more times for three experiments.

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1 Flatten a piece of clay,large enough for a jar, on the table.
2  Place a tea light candle in the center of the clay.
3 put goggles on for safety.
4 Use a match to light the candle. Caution when lighting matches keep sleeves, hair, fingers and objects away from the flame.
5 Shake or blow out the match and put the match into a petri dish. Be careful  not to drop the match.( Relight the candle if needed.)
6 At the same time turn the jar upside down over the the lit candle and start the stopwatch. When placing jar over the candle, press the jar into the clay to make a seal. This is the control.
7 Make observations about the flame. Record in observation section. Remember to use details.
8Time until the flame goes out. Record time in seconds in the  data table.
9 Remove the jar from the candle.
10 carefully place the jar back over the the lit candle.
11 Repeat steps 4-10 two more times for accuracy
12 Find the average of the 3 trials and record on data table

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o2 =oxygen

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In my experiment I will be using the following.  

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In my experiment I will be using the following.  

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* a small candle
* a jar
* a match
* safety goggles
* paper
* clay
*stop watch
* water
*paper towels
*petri dish

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  Question If a washed jar and unwashed jar are placed over a lit candle how will it affect the the amount of CO2 affect the length of time the candle burns?

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  Question If a washed jar and unwashed jar are placed over a lit candle how will it affect the the amount of CO2 affect the length of time the candle burns?