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Posted: September 1st, 2023
Chemistry 101 Lab 2 essay
Student Name: Click here to enter text.
Access Code (located on the lid of your lab kit): Click here to enter text.
Pre-Lab Questions:
1. Which of the following are testable using scientific experimentation.
a. Are there more seeds in a medium sized Red Delicious Apple or a medium size Green Granny Smith Apple? Click here to enter text.
b. Why do people smoke cigarettes? Click here to enter text.
c. What happens to your blood glucose level if you do not eat lunch? Click here to enter text.
d. Which planet is the most interesting one to study? Click here to enter text.
e. Which objects are attracted by a magnet: a metal paperclip, copper penny, or aluminum foil? Click here to e Click here to enter text. nter text
2. For each of the following questions, write a reasonable hypothesis using the “If__________ (independent variable), then_______________ (dependent variable)” format.
a. Does water affect the growth of a plant?
If Click here to enter text. then Click here to enter text..
b. Does temperature affect the amount of sugar that dissolves into tea?
If Click here to enter text. then Click here to enter text..
c. Does the volume of a container affect how quickly water will evaporate from it?
If Click here to enter text. then Click here to enter text..
Experiment 1: Testable Observations
Determine which of the following observations are testable. For those that are testable, answer the following:
Determine if the observation is qualitative or quantitative.
Write a hypothesis and null hypothesis.
What would be your experimental approach?
What are the dependent and independent variables?
What are your controls – both positive and negative?
Observations
1. A plant grows three inches faster per day when placed on a window sill than it does when placed on a on a coffee table in the middle of the living room.
Testable?- Click here to enter text.
Hypothesis- Click here to enter text.
Null Hypothesis- Click here to enter text.
Experimental Approach- Click here to enter text.
Dependent Variable- Click here to enter text.
Independent Variable- Click here to enter text.
Control(s)- Click here to enter text.
2. The teller at the bank with brown hair and brown eyes is taller than the other tellers.
Testable?- Click here to enter text.
Hypothesis- Click here to enter text.
Null Hypothesis- Click here to enter text.
Experimental Approach- Click here to enter text.
Dependent Variable- Click here to enter text.
Independent Variable- Click here to enter text.
Control(s)- Click here to enter text.
3. When Sally eats healthy foods and exercises regularly, her blood pressure is 10 points lower than when she does not exercise and eats fatty foods.
Testable?- Click here to enter text.
Hypothesis- Click here to enter text.
Null Hypothesis- Click here to enter text.
Experimental Approach- Click here to enter text.
Dependent Variable- Click here to enter text.
Independent Variable- Click here to enter text.
Control(s)- Click here to enter text.
4. The Italian restaurant across the street closes at 9 pm, but the one two blocks away closes at 10 pm.
Testable?- Click here to enter text.
Hypothesis- Click here to enter text.
Null Hypothesis- Click here to enter text.
Experimental Approach- Click here to enter text.
Dependent Variable- Click here to enter text.
Independent Variable- Click here to enter text.
Control(s)- Click here to enter text.
5. For the past two days, the clouds have come out at 3 pm, and it has started raining at 3:15 pm.
Testable?- Click here to enter text.
Hypothesis- Click here to enter text.
Null Hypothesis- Click here to enter text.
Experimental Approach- Click here to enter text.
Dependent Variable- Click here to enter text.
Independent Variable- Click here to enter text.
Control(s)- Click here to enter text.
6. George did not sleep at all the night following the start of daylight savings.
Testable?- Click here to enter text.
Hypothesis- Click here to enter text.
Null Hypothesis- Click here to enter text.
Experimental Approach- Click here to enter text.
Dependent Variable- Click here to enter text.
Independent Variable- Click here to enter text.
Control(s)- Click here to enter text.
Experiment 2: Using the Scientific Method
Table 3: Number of Drops of Water that Fit on a Penny
Trial Predicted # of Drops Actual # of Drops % Error
1 Click here to enter text.
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2 Click here to enter text.
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3 Click here to enter text.
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4 Click here to enter text.
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5 Click here to enter text.
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Average N/A Click here to enter text.
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Post-Lab Questions
1. Why did you perform more than one trial?
Click here to enter text.
2. What are the benefits of repeated trials?
Click here to enter text.
3. Insert a picture of your bar graph with your name clearly visible.
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