Identify the dependent and independent variables for this experiment. If the purpose of a lab is to find the density of aluminum, then tell what the experimental value for the density of aluminum is in this section.
Pre-Lab Week 1 Read the information in this document and pay careful attention to the sample problems. You can remind them that carbon dioxide was created and it also takes up space. When the candle goes out and the air cools, it contracts.
Note that a hypothesis is not a prediction for an event outcome but rather a tentative explanation for an observed event. What does this tell you about the part of the candle that is burning? How does this thing change when I change that thing?
The answers do not have to be in complete sentences as long as you have included the question in this section.
If you see soot, you are probably holding the candle too close to the flame. If I measure the noise level in a classroom when a teacher is in it and when she leaves the room, then I will see that the noise level is higher when my teacher is not in my classroom.
Examples of Hypotheses and Predictions Question Prediction How does the size of a dog affect how much food it eats? Give a very short summary of the steps taken to collect data. Stopper the flask and swirl the solution for about 1 minute.
A single hypothesis can lead to multiple predictions, but generally, one or two predictions is enough to tackle for a science fair project. Predictions should include both an independent variable the factor you change in an experiment and a dependent variable the factor you observe or measure in an experiment.
When scientists do an experiment, they very often have data that shows their starting hypothesis was wrong. A hypothesis is not merely an educated guess. Remember to always use significant digits and units when recording measurements.
When the Erlenmeyer flask is placed over the top of the candle in the water, student should observe that the water candle goes out and the water rises. Does fertilizer make a plant grow bigger? A hypothesis is a general belief, pattern, model, or rule developed from observations in an attempt to answer a posed research question.
An example scenario will help clarify the approach of this text and demonstrate the differences between acceptable and unacceptable hypotheses.
Identify the dependent and independent variables. For example, in addressing causal research questions a treatment is deliberately imposed the cause and a possible response is observed the effect. When the flask was placed over the candle, the flame went out and the water rose.
Hold the flask in place for approximately one minute. Use this lesson as a guide whenever you have to write up a report.
This should lead them to conclude that it is the wax vapor that is burning. Do you think that gas would be oxygen, hydrogen or carbon dioxide?
One of the first steps in designing any scientific investigation is to identify which variable is which-- independent or dependent? A hypothesis leads to one or more predictions that can be tested by experimenting. For any other use, please contact Science Buddies. Students will usually recognize that the condensation is made of water, but they have difficulty recognizing that it comes from the combustion of the candle.
Propose an explanation for why this occurred. Temperature, distance, and time are variables. Relight the standing candle and blow out the second candle.
If questions are part of the lab, answer them here. If I add fertilizer to the soil of some tomato seedlings, but not others, then the seedlings that got fertilizer will grow taller and have more leaves than the non-fertilized ones.How to Write a Lab Report.
or conclusions based on observations. Calculations: For example, if your hypothesis was that burning was a chemical change, in the conclusion, you would write “The hypothesis was supported because the burning process showed different products and is, therefore, a chemical change.” The conclusion.
Is the hypothesis based on information from reference materials about the topic? Yes / No: Can at least one clear prediction be made from the hypothesis?
Educators can also assign students an online submission form to fill. hypothesis. An important attribute of a hypothesis is that it must be testable. The testing of the hypothesis involves performing a carefully controlled experiment to obtain data that can be used to support, disprove, or modify the hypothesis.
Write a hypothesis based on your observations. 3. Describe the design of the experiment that you. Ernesto is the students I observed for 30 minutes during my observations. Ernesto is a struggling reading who can get distracted easily and keeps distracting the class.
Ernesto is a struggling reading who can get distracted easily and keeps distracting the class. This is a lab experiment where students make detailed observations of a candle use them to infer the products of combustion of a candle.
In this activity, students observe a candle from a chemist's point of view. Write your observations below. What does this tell you about the part of the candle that is burning? Observations 5. Relight the. What does hypothesis A predict will happen if a jar is placed over a burning candle?
2. What does hypothesis B predict will happen if a jar is placed over a burning candle? 3. When a jar is placed over the candle, the flame goes out.
What type of observations will the students make? PROBLEM NUMBER THREE: Suggest a hypothesis based .Download