Scientific Method with alcohol and H2O (Elba Lopez)
Source(s):
Source(s):
http://en.wikipedia.org/wiki/Water
Title: Making accurate measurements and observations
Title: Making accurate measurements and observations
Principle(s) Investigated:
Principle(s) Investigated:
overall: Use and apply scientific tools and the scientific method to make accurate measurements and observations.
overall: Use and apply scientific tools and the scientific method to make accurate measurements and observations.
chemistry: Conservation of matter/mass
chemistry: Conservation of matter/mass
Scientific progress is made by asking meaningful questions and conducting careful investigations. As a basis for understanding this concept and addressing the content in the other three strands, students should develop their own questions and perform investigations. Students will:
Scientific progress is made by asking meaningful questions and conducting careful investigations. As a basis for understanding this concept and addressing the content in the other three strands, students should develop their own questions and perform investigations. Students will:
a.Select and use appropriate tools and technology (including calculators, computers, balances, spring scales, microscopes, and binoculars) to perform tests, collect data, and display data.
a.Select and use appropriate tools and technology (including calculators, computers, balances, spring scales, microscopes, and binoculars) to perform tests, collect data, and display data.
c.Communicate the logical connection among hypotheses, science concepts, tests conducted, data collected, and conclusions drawn from the scientific evidence.
c.Communicate the logical connection among hypotheses, science concepts, tests conducted, data collected, and conclusions drawn from the scientific evidence.
e. Communicate the steps and results from an investigation in written reports and oral presentations.
e. Communicate the steps and results from an investigation in written reports and oral presentations.
Materials:
Materials:
- Test tubes
- Water
- Alcohol
- Test tube racks
- Graduated cylinders
Procedure:
Procedure:
1. You will need to label and weigh 6 test tubes. Record the weights of the test tubes on the data table.
1. You will need to label and weigh 6 test tubes. Record the weights of the test tubes on the data table.
2. Label 3 test tubes “A” and 3 test tubes “B”.
2. Label 3 test tubes “A” and 3 test tubes “B”.
3. Obtain solution A and solution B from the teacher.
3. Obtain solution A and solution B from the teacher.
4. Using a graduated cylinder, measure 5mL of solution A and pour it into one of the test tubes labeled solution “A”. Repeat two more times for the remaining two tubes. (NOTE: You should have 3 Test tubes labeled “A” each containing 5mL each)
4. Using a graduated cylinder, measure 5mL of solution A and pour it into one of the test tubes labeled solution “A”. Repeat two more times for the remaining two tubes. (NOTE: You should have 3 Test tubes labeled “A” each containing 5mL each)
5. Weigh each test tube and record its weight with the 5mL of solution A.
5. Weigh each test tube and record its weight with the 5mL of solution A.
6. Using a graduated cylinder, measure 5mL of solution B and pour it into one of the test tubes labeled solution “B”. Repeat two more times for the remaining two tubes. (NOTE: You should have 3 Test tubes labeled “B” each containing 5mL each)
6. Using a graduated cylinder, measure 5mL of solution B and pour it into one of the test tubes labeled solution “B”. Repeat two more times for the remaining two tubes. (NOTE: You should have 3 Test tubes labeled “B” each containing 5mL each)
7. Weigh each test tube and record its weight with the 5mL of solution B.
7. Weigh each test tube and record its weight with the 5mL of solution B.
8. Combine two test tubes “A” and record the final volume and weight.
8. Combine two test tubes “A” and record the final volume and weight.
9. Combine two test tubes “B” and record the final volume and weight.
9. Combine two test tubes “B” and record the final volume and weight.
10. Combine one test tube “A” and one test tube “B” and record the final volume and weight.
10. Combine one test tube “A” and one test tube “B” and record the final volume and weight.
Student prior knowledge:
Student prior knowledge:
- how to make accurate measurements (reading the meniscus)
- how to follow written procedures
Explanation:The water and ethanol molecules are different sizes, with the ethanol molecules being larger. Some of the water fits in the spaces between the ethanol molecules.
Explanation:The water and ethanol molecules are different sizes, with the ethanol molecules being larger. Some of the water fits in the spaces between the ethanol molecules.
Questions & Answers: Give three thought-provoking questions and provide detailed answers.
Questions & Answers: Give three thought-provoking questions and provide detailed answers.
- What other substances would react similar to water and alcohol?
- How do we know the sizes of molecules?
Applications to Everyday Life:
Applications to Everyday Life:
Students continuously ask questions about the world and they need to be equipped with the skills to problem solve on their own. Students use the scientific method on a daily basis to make decision and to explain what is happening. For example when they meet a new person, the student may first observe and see if they even want to talk to the person. He/ she will base their decision on evidence such as facial features and body language. They will test their hypothesis that this person might be a good friend. Through daily activities the student will gather data that supports or rejects their hypothesis and make a conclusion. The student will decide if he/she will continue the relationship or abandon it.
Students continuously ask questions about the world and they need to be equipped with the skills to problem solve on their own. Students use the scientific method on a daily basis to make decision and to explain what is happening. For example when they meet a new person, the student may first observe and see if they even want to talk to the person. He/ she will base their decision on evidence such as facial features and body language. They will test their hypothesis that this person might be a good friend. Through daily activities the student will gather data that supports or rejects their hypothesis and make a conclusion. The student will decide if he/she will continue the relationship or abandon it.
Photographs:
Photographs:
Videos: Include links to videos posted on the web that relate to your activity. These can be videos you have made or ones others have made.
Videos: Include links to videos posted on the web that relate to your activity. These can be videos you have made or ones others have made.