Question

Lab report for density of solids

Answer 1

1. What is the purpose of the lab, the importance of the topic, and the question you are trying to answer?

The Purpose of the lab is to displace water to determine volume.And weigh objects to get mass. Then We would divide the two and get density.How do we determine density?

2. What is your hypothesis (or hypotheses) for this experiment?

You get mass from weighing objects and you get volume from displacing water. Then you can divide them both to get density.

3. What methods are you using to test this (or each) hypothesis?

We were using scales and water displacement methods to get density.

Section II: Data and Observations

4. Locate the data and observations collected in your lab guide. What are the key results? How would you best summarize the data to relate your findings?

In a lab guide, the key results are those that support my working hypotheses or serve to reject these assumptions. Moreover, the key results may also be other discoveries that are important to understand the processes and/or mechanisms investigated in the experiment.

In my experience, the best way to summarize the key results is to create diagrams and illustrations that enables me to study relationships between different data

5. Do you have quantitative data (numerical results or calculations)? Do you have qualitative data (written observations and descriptions)? How can you organize this date for your report?

yes from the experiments we received numerical data for each object then we would use that data to find the mass volume to get density. We drew pictures to create a visual representation. You can simplify it into a small short worded sentence.

Section III: Analysis and Discussion

6. What do the key results indicate?

That we got the density from the mass and volume. By using different methods to get them.

7. If you constructed graphs, what trends do they indicate in your data?

We didnt need to construct graphs.

8. Were there any problems with the experiment or the methods? Did you have any surprising results?

No there was not any weird things that happened. The findings were normal.

Section IV: Conclusions

9. What do the results tell you about your hypothesis(es)?

That we were right.

10. How do the data support your claim above?

That we were right about our hyphothesis.

11. If you could repeat the experiment and make it better, what would you do differently and why? there is no point

Writing the Lab Report

Now you will use your answers from the questions above to write your lab report. Follow the directions below.

Section I: Experimental Overview

Use your answers from questions 1–3 as the basis for the first section of your lab report. This section provides your reader with background information about why you conducted this experiment and how it was completed. Outline the steps of the procedure in full sentences. It also provides potential answers (your hypothesis/es) relative to what you expected the experiment to demonstrate. This section should be 1–3 paragraphs in length.

Section II: Data and Observations

Use your answers from questions 4–5 as the basis for the second section of your lab report. This section provides your reader with the data from the experiment, in a summarized and concise way. No paragraphs are required for this section, but you do need to include the key data and observations from which you will generate your analysis and discussion. This section is objective.

Section III: Analysis and Discussion

Use your answers from questions 6–8 as the basis for the third section of your lab report. This section provides your reader with your interpretation of the data set. You will also give an example of any calculations or formulas you used to analyze your data. Also, you will want to include any graphs that you made and interpret them for the reader.

If you did construct graphs, your Student Guide included information on which graphs to construct. Graphs should have the following:

a. Appropriate titles

b. Appropriate labels for each axis

c. Appropriate scales for each axis

d. Correct units for the data

Answer 2

YOUR research question is …

(Example: What will be the effect of changing ............on………?/How will changing........ affect ............? OR (How does the (IV) affect the DV?

Independent variable

(what you are changing in the experiment)

the type of liquids: example water or oil.

( cm3 )

Dependent variable

(what you are measuring in the experiment)

This is what changes BECAUSE you changed the independent variable

The density of liquids

I will measure it using:

Grams and a scale.

Controlled variables

(What you will keep the SAME to have a fair test) How to control the variables?

(I will keep it the same by….) How they affect the data?

1

Same volume of liquid I will keep it the same by putting the same amount of liquid for the experiment. It will effect it but giving us an inaccurate results.

2

Measuring cylinder I will keep it the same by using the same measuring cylinder for each time I do the experiment. It will effect it by maybe putting in different measurements

3

Unit of measurement I will keep it the same by using the measurement tools and putting it in the same setting to avoid confusions It will effect it by lots if confusion and non similar measurments.

4

Hypothesis

(What you think will happen. Use the words increase/decrease)

(If …………increases, then ……………..will increase/decrease)

The liquids that weigh more (a higher density) will sink below the liquids that weigh less (a lower density). My scientific reasons for thinking this are because I think that thicker liquids have molecules that are closer to each other than thinner liquids.

(reference according to MLA)

Materials

(Make a list of all the equipment or apparatus that you will need)

(Don’t forget to put the size, quantity & volume of the equipment you will need)

Material/

Equipment Size/Quantity/

Volume Drawing Unit of measurement Absolute

uncertainties

Measuring cylinder 2 Cm3

Oil 10 ml

Cm3

Scale 1

grams

Water 10ml

Cm3

Procedure

(This is your method, explain what you will do)

(Use simple and clear instructions)

1. Prepare all materials and equipment needed for the experiment.

2.Measure the measuring cylinder

3. pour water to the measuring cylinder

4.put the measuring cylinder on top of the scale.

5. write down the weight of the water.

6.pour the oil into the measuring cylinder and repeat

7. after recording the weight of both of the liquids, we compare and repeat for a more accurate and precise measurement.

RESULTS

Title: Discover the density of liquids

The liquids

Mass of the cylinder Mass of cylinder + liquid grams Mass of liquid grams Density grams/ cm3

1 oil

62.29 72.54 10.25 1.025

2

water 62.29 72.83 10.54 1.054

3

4

5

Show your calculations here

Conclusion

This experiment was about discovering the density of different liquids.

My hypothesis was” The liquids that weigh more (a higher density) will sink below the liquids that weigh less (a lower density). My scientific reasons for thinking this are because I think that thicker liquids have molecules that are closer to each other than thinner liquids.

My hypothesis was proved because the graph/results shows that the water is more dense.

I think this happens because (Explain your results using what you know about science. You may use books or internet. Include scientific language and diagrams to explain your conclusion) Some substances are made up of a large number of molecules. Only water molecules are attracted to one other Water molecules. The only thing that attracts oil molecules is other oil molecules. Because water is denser (heavier) than oil, they cannot combine.

Evaluation

Weaknesses in the method Realistic improvement

-To do more trials for more accurate results - That we focused on making sure to check the measurements with eye level.

This investigation has made me think of a new question, which is “why are oil less dense than water but oil is thicker”.

❏ I could test this by putting oil above water to see if its gonna float or not.

Step-by-step explanation: