Chem Lab Report

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CHEMISTRY
Group no. 6
Leader: Hembrador, Maria Celina D.Yr. and Section: 3-33 St. Hildebrand
Members:Date: August 2, 2012
Angeles, Vince Miguel R.
Bonifacio, Froilan Louis C.
Orioste, Juan Vidal M.
Sioson, Christian Adrian A.

ACTIVITY #3
I. TITLE
Attributes of the Scientific Method

II. OBJECTIVES
1. Use the processes of observation and inference in a scientific investigation. 2. Analyze the elements of a scientific method

III. PROBLEM
1. What are the elements of a scientific method?
2. Is the scientific method a way of solving problems accurately? 3. Why is it important to use the scientific method in solving problems?

IV. HYPOTHESIS
The elements of a scientific method consists of the following, observation, problem identification, gathering facts and information, formulating a hypothesis, testing the hypothesis also known as experimentation, drawing a conclusion, and lastly doing retests. With the use of the scientific method, which is elaborate, it is guaranteed to produce accurate results. When solving problems, the scientific method is important to use because as said earlier, it gives us good answers.

V. PROCEDURE
We filled a 100 mL beaker half-full with tap water and added a spoonful of a blue-green chemical to the water, without stirring. As we watched the experiment, the data observed was written like a list.

After writing the data, we took a piece of aluminum foil and formed it into a loosely rolled shape about the size of a regular hotdog and let it stand in the solution. A few minutes passed and the data observed was written in the list. When we were finally convinced that the reaction is finished, the aluminum foil was disposed in a waste bin.

VI. DATA AND OBSERVATIONS
A. Data:
1. Which of the following statements is not a scientific observation? For those that are not observations, briefly explain why they are not. a. The magnesium ribbon is 15 cm long.
b. The substance is red-orange in color.
c. The reaction is producing a red-brown solid. It must be rust. ANSWERS:
NOT SCIENTIFIC OBSERVATION:
The reaction is producing a red-brown solid. It must be rust. * The statement is not a scientific observation because it is an inference. Though the sentence ‘The reaction is producing a red-brown solid.’ can be classified as an observation but because it was followed by ‘It must be rust.’ we can say that that is an inference. Why? An inference is the information that is based from the observation relating to one’s experiences. 2. What distinguishes an observation from a conclusion?

= An observation is something that is perceived by our senses while a conclusion is the answer to a problem.

B. Observations:
1. Observations made before the experiment begins:
* The foil was silver in color
* The water is clear
* The blue-green chemical looks just like blue colored salt * The water did not have any other present substances

2. Observations made in procedure step 1
* The blue-green chemical was suspended in the bottom of the beaker. * The water turned milky in color
3. Observations made in procedure step 3
* The blue-green chemical slowly dissolved in the water whilst stirring. * The water turned blue but was still transparent in appearance, not foggy. 4. Observations made in procedure step 4

* The blue-green chemical stayed the same
* The aluminum foil started to chip and disintegrate. The edges of the holes became brown or copper in color.

C. Analysis
1. Do your observations from procedure step 1 indicate a chemical reaction? Explain. * When the blue-green chemical was added into the water, the water became foggy and milky. This is a chemical reaction because the chemical content of the water was altered but its physical state was not. 2. Do your observations from procedure step 3 indicate a chemical reaction? Explain....
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