Evaluate Other's Work Lab Report

Question 1: Evaluate Other's Work Mrs.Leonardos' conclusion and her overall experiment has some limitations.For example, she doesn’t have a hypothesis or a clear independent variable that was supposed to be in her question.According to her chart, the densities of the 2 clays are not different by about .2 g/cm3 which means that the kind of clay that she is using might be different which can make the experiment have 2 independent variables (size and the type of clay).This will make the experiment uncontrolled which will not yield any reliable data.Also, according to her conclusion, she has no evidence from text and/or her data table.

Question 2: Formulate a Testable Question How does the size of the pieces of modeling
clay affect the density of the clays?

Question 3: Formulate a Hypothesis If the size of a piece of clay is larger, then the density will stay the same because according to the article,"Because it is a ratio,the density of a material remains the same no matter how much of the material is present" which shows that no matter how much there is of one object,the density will stay the same.
Question 4: Procedure
Materials: Graduated Cylinder, Red Modeling Clay, Triple-beam Balance, Calculator
1)Cut the red modeling clay into 3 pieces with different sizes (small,medium,and large)
2)Create a data table that includes 4 sections (Clay size,Mass,Volume,Density) and it needs to include trials (1,2,3)
3)Measure the small piece of clay's mass using the triple-beam balance,and record the result on the data table for small sized clay, and use units to the tenth place.
4)Measure the volume of the small piece of clay using the graduated cylinder and record it under the volume section for small sized clay (record to the tenths)
5)Then, use the calculator and find the density of the small clay by using the formula D=M/V,and record on the data table (unit is g/cm3 and also to the nearest tenth)
6)Repeat 3 to 5 with medium and large
clay.
7)Get a 2 new batches of red modeling clay and then repeat 1-6 twice for trials 2 and 3.
8)Average the mass and the volume for all 3 sizes of clay with the data from the trials and then use the calculator to find out the density again.
9)Compare the densities of the 3 different sized clays and see if it supported your hypothesis.

Question 5: Data Table (Will be included with the packet)
Question 6: Bar Graph (Will be included with the packet)
Question 7: Analysis of Results After the experiment that i have done, I found out that the average density for the small pieces of clay is 1.8 g/cm3.I found out that the average density for the medium pieces of clay is 1.6 g/cm3 and that the average density for the large pieces of clay is 1.6 g/cm3 as well. The difference between the densities of the different sized clays are only .2 g/cm3 which shows that the size of the clay doesn't really affect the density of the red modeling clay, and also the numbers in the trials were far away but densities were similar which also supports the size of the clay doesn't affect the density of the clay. This makes sense because according to the article,"Becasue it is a ratio, the density of a material remains the same no matter how much of that material is present".

Question 8: Draw Conclusions My hypothesis was that the size of the modeling clay doesn't affect the density of the clay. They data that I have collected actually supported my hypothesis. According to my data table, the average densities of the 3 different sized clay pieces are really close which means that size doesn't really matter. The densities were still similar even though the sizes were different. For example, the average density for the small piece of red modeling clay was 1.8g/cm3 and for the medium and large are both 1.6g/cm3. The fact that the densities are similar,this means that volume doesn't really matter. This occurs because according to the text, "Because its a ratio, the density of a material remains the same no matter how much of the material is present".

Question 9: Support Your Claim Mrs.Leonardos' experimental design was uncontrolled which means that the experiment will not yield reliable data where my experimental design was controlled because in my experiment, there is 1 isolated variable and all the other variables were kept constant.
The one isolated variable in the experiment is the size of the clay pieces while all other variables like the color of the clay were all kept constant. According to Mrs.Leonardos' data table, the 2 densities does not have similar densities which means that something in her experiment is affecting the density of the different sized clay pieces (like kind of clay which can be one of the factor that is making her experiment uncontrolled). In her question, the independent and the dependent variables are not clear. She had no hypothesis or rational and her procedure didn't include materials needed for the experiment. Another negative factor of her experimental design is her conclusion, she didn't use evidence from her chart or textual evidence from the article either. In my experiment, the densities were close together, I had clear independent and dependent variable in my question which is the size of the modeling clay and the densities of clays. My experiment also has a hypothesis and a vaild rationale, in my conlusion, I had textual evidence and details from my data
charts.