5th Grade Winners!. WHAT ARE THE MOST COMMON SUMS OF TWO DICE WHEN ROLLED AT DIFFERENT DISTANCE. CHRISTOPHER BRITT 1/18/2011. WHAT I ALREADY KNOW IM ABOUT THE TOPIC. WHAT I ALREADY KNOW ABOUT THE TOPIC IS YOU HAVE TO ROLL DICE AND YOU HAVE TO SEE WITCH SUM COMES UP THE MOST.
5th Grade Winners!
WHAT ARE THE MOST COMMON SUMS OF TWO DICE WHEN ROLLED AT DIFFERENT DISTANCE.
WHAT I NEED TO KNOW ABOUT THE TOPIC.
WHAT POSSIBLE QUESTION COULD I EXPLORE ABOUT THE TOPIC.
THE DICE ROLLED.
I HOPE THAT THE SUM WILL CHANGE.
EFFECT OF SALT WATER SOLUTION ON POTATO CUBES
By Nnadozie Okarazu
Do potato cubes gain or lose mass in salt solution?
If potato cubes placed in 2 containers, one with salt water solution and the other with ordinary water, are left for a length of time, the potato cubes in salt solution will lose mass while the ones in ordinary water will gain mass because salt solution, being more concentrated than the solution inside the potato, will draw out water from the potato cubes while the potato cubes in ordinary water will gain mass.
My control variables were length of time of observation, amount water added and the weight of potato cubes used in all the experiments. In experiment A, I kept time the same at 12 hours while I manipulated the amount of salt added. In experiments B the length of time of observation was held constant at 18 hours and in experiment C at 24 hours. I also kept the amount of water added at 3 oz and the weight of potato cubes for each sample at 4 oz.
I used the following materials:
I used nine 8 ounce clear cups for my experiment. In the first experiment (A), I placed in 3 cups potato cubes 4oz by weight. About 3 oz of water was added into each of the 3 cups to cover the potato cubes completely. In Sample 1, only water was added. In sample 2, 3 tablespoons of salt was added into the water with potato cubes. In sample 3, 5 tablespoons of salt was added. Samples 1, 2 and 3 were placed under observation for 12 hours.
At the end of the experiment, water was drained and the potato cubes were put into food scale and weighed. The weights of the 3 samples were recorded. The results were recorded under experiment A as first trial. The experiment was repeated three times using the same quantities of potato cubes, salt and the same number of hours. For each sample, the three results were added and their sum was divided by 3, being the number of trials. The quotient is the average loss or gain in mass for each sample.
In experiment B, another set of samples were prepared using the same quantity of potato cubes, and salt. However, in the second experiment, the number of hours of observation was increased to 18 hours. At the end, the potato cubes were drained of water, weighed and recorded under experiment B. The experiment was repeated 3 times. Then I calculated average weight gain or loss.
In experiment C, fresh samples of potato cubes were used with no salt added to sample 1, 3 tablespoons to sample 2 and 5 tablespoons to sample 3 as in experiments A and B. The number of hours of observation was increased from 18 hours to 24 hours. The experiment was repeated 3 times and average weight gain or loss was calculated.
Table 1: Average weight gain for potato cubes in ordinary water after 3 trials in 3 different experiments
Table 2: Average weight loss for potato cubes in 3 tablespoons salt solution after 3 trials in 3 different experiments
From my observations, I found out that potato cubes lose weight when soaked in salt solution. The more the amount of salt added, the more the weight loss. This proves my hypothesis that potato cubes in salt solution will lose mass while the ones in ordinary water will gain mass because salt solution, being more concentrated than the solution inside the potato, will draw out water from the potato cubes while the potato cubes in ordinary water will gain mass. I also observed that the longer the potato cubes were soaked, the more the loss in mass.
Macmillan McGraw-hill (2005) Science Grade 6, Blacklick: OH
ehow.com/how: How to Do an Osmosis Science Experiment with KidseHow.comw .com/how 5210855_do-osmosis-science-experiment-kids.html#ixzz1
Kids.Net.Au –Online Dictionary available January, 2011 at dictionary.kids.net.au/word/osmosis
Which object can protect the apple the longest?
I don’t know which object will take care of the apple.
Do plastic wrap protect apples better?
Do apples stay fine without protection?
Is it better to leave out or place in fridge?
In this experiment I will see which object will take care of the apple the longest.
What I did was instead of me leaving the apples in the refrigerator for a couple of hours I left the apples in there for a whole day.
Leaving the apples in the refrigerator with different covering will keep the apples longer.
Wrapping for apples
Rate of Molding/dehydration
Amount of plastic wrap, the aluminum foil, paper bags, and the wax paper, time.
Yes I was right I said that plastic wrap will protect the apple the longest.
Its The Time Glass Of Nature
Does sand in a hourglass fall faster down the other side then brown sugar does?
I think that the brown sugar will go down the fastest because the sand has a lot of minerals which mit hold it back.
Independent Variable: What I have changed on purpose is the type of soil. ( brown sugar, sand)
Dependent Variable: What I think will change during my investigation is how fast each type of material goes down the hourglass.
Controlled Variable: What I have kept the same is the amount of sand and brown sugar, the size of the container ,and the timer.
What you will need for this project is:
4-2litter soda bottles
5 cups of brown sugar
5 cups of sand
Smooth surface to work on
2 paper towel
1 timer/ stopwatch
Step 1: Before you can start this project you first have to clean all the bottles with soap, and water after you have done that lay it out to air dry (10min) paper towels will not work.
Step 2: Gather all your materials and neatly place them on the flat surface, then take one of your 2 litter soda bottles and place it over one of your paper towels.
Step 3: After you have done the second part of step two take out your funnel and sand, next place your funnel over the bottle with the paper towel below it.
Step 4: Take your sand and pour it into your funnel as you pour the sand should be dropping into the bottle
Step 5: Take one of your other bottles and place the bob on the little end of the soda bottle
Step 6: Next place the other end of the bob on the little end of the soda bottle with sand in it, don’t forget to take off the funnel
Step 7: After you are down these steps you should have one whole piece, the side with the sand facing down and the side with nothing facing upward.
Step 8: Get your timer or stopwatch out, place it on the flat surface, then turn your hourglass so that the side with the sand is facing upward then start your stopwacth as soon as the sand starts to fall
Step 9 : Repeat steps 2,3,4,5,6,7,and 8 over again for the brown sugar hourglass.
My hypotheses was wrong because I thought the brown sugar would go down faster but the sand ended up going down faster. ( 160< 190).
Goggle.com( help with steps)
Youtube.com ( see how to make a hourglass)