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About mariodifonza

I am a physics and maths teacher, a Scientix Ambassador, an Eu Codeweek Leading teacher, and an advocate of the importance of the synergy of school subjects and hands-on learning.

Grilli che c(a)ontano!

Multidisciplinary activity that involves the STEM disciplines.

Its focus is the study of climatic factors and the causes which are leading to an increase in temperatures.

Age : 14-15 years

STEM : math, science, biology, physics, english.

Teachers: Mario Di Fonza, Sabrina Nappi, Rosanna Busiello, Josephine Iannone

Introduction

Song of crickets

First, the students listen to the cricket song https://www.youtube.com/watch?v=UGOS4e99kj4

Students answer questions :

  • Why do crickets chirp?
  • Did you know that only male crickets chirp?

Pupils take a quiz on www.mentimeter.com

Possible answers:

Crickets sing to….

1. Call the female: male cricket’s challenge is to be loud enough to be heard

2. Courting ritual

3. Drive other males away.

The song of crickets is the nocturnal soundtrack of our collective rural, suburban and even urban lives.

Some other questions:

The species

Crickets are insects belonging to the orthoptera family, and as such they emit sounds called chirps.

The song of the cricket

The students listening with greater attention to the song of a cricket https://www.youtube.com/watch?v=UGOS4e99kj4. The most bizarre and interesting thing to observe is that this song is discontinuous and is related to the temperature. The temperatures rise and you can hear the cries of crickets.

The crickets “sing” rubbing their legs. The warmer the weather is, the faster they “sing”.

Its focus is the study of climatic factors and the causes which are leading to an increase in temperatures as a function of the perceived chirps of crickets.

Thermometers of the poor

Crickets are considered the thermometers of the poor, an expression that comes from the observation that the chirping of these animals increases or decreases in relation to the temperature of the environment. Crickets are cold-blooded, which means they take on the temperature of their surroundings. The temperature rises and crickets chirp more easily. The temperature drops and the reaction rate of the crickets slows down, causing their chirping to decrease as well.

The Engagement is curious the students are invited to verify this discovery.

Investigation phase

In this paragraph, the Students are provided with data taken from a research carried out in 2007 in Boulder (Colorado, USA), and are asked if it is possible to find a relationship between the number of crickets’ chirps (f) and the location temperature (t).

The students analyze the data on the table and build a scatter chart by observing how the points are arranged through the use of google sheets, and discuss it in groups.

The students from reading the graph create a mathematical model that relates the temperature to the song of the crickets: t = a ∙ f + b, number of crickets’ chirps (f) and the location temperature (t).

The relation: t = a ∙ f + b gives the value of the correlation between the increase in temperature and the song of the crickets.

Students write the equation of the regression line passing through the points in the graph and calculate the correlation coefficient.

Deepining on the blog

https://www.globe.gov/explore-science/scientists-blog/archived-posts/sciblog/index.html_p=45.html

Dolbear’ s Law

From the analysis of the data, students move on to analyze Dolbear’ s Law in physics.

Amos Dolbear, was a 19th century American physicist, professor and inventor who studied various species of crickets to determine the relation between the number of chirps per minute and the ambient temperature.

In 1897 Amos published an article “The cricket as a thermometer”, where the formula is reported (Dolbear’ s Law): T = 50 + ((N – 40) / 4)

where T is the temperature in Fahrenheit degrees and N is the number of chirps per minute.

The students convert Fahrenheit to Kelvin. They convert them to Celsius as an exercise too.

Dolbear’ s law applied to the chirping of crickets allows us to estimate temperatures between 55 and 100 degrees Fahrenheit. On summer evenings the crickets feel at their best.

Deepening with the sciences

The students reflect on the question: What happens in human beings if the internal temperature increases? The consequence is the link between physics and the sciences: the heart beats faster if the internal temperature increases.

Pupils are asked, in pairs, to determine and share their body temperature by measuring the frequency of heart beats per minute, taking into account the relationship between heart activity and the internal body temperature reported:

Resting adult

Resting adult fever inside the abdomen
with 70 beats per minute 37°C
with 80 beats per minute 37/38°C
with 90 beats per minute 38°C
with 100 beats per minute 38°C
with 110 beats per minute 39°C
with 120 beats per minute 40°C

Pupils discussed on the table, observing how each degree Celsius of body temperature increase corresponds on average to 8 beats per minute increase in heart rate.

In this way, the focus is on the study of climatic factors that increase temperatures.

Exercises

So to get different results the pupils tried to “warm up” by running or doing some physical exercise.

Deepening with the biology

The activity ends with the experimental part in biology which concerns the use of crickets to study the effect of temperature on the metabolism of cold-blooded organisms.

Small insects have a trachea where diffusion occurs, carrying oxygen and removing the carbon dioxide necessary for cellular respiration.

The students using the chemical reaction

 

and the image:

http://www.benesserelongevitasalute.it/2017/03/30/lenergia-e-la-vita/

Students are asked to:

– find the correlation between the two images.

– specify the reactants of this reaction, and the products;

– describe what they observe

– specify what are the factors that can slow down or speed up a chemical reaction, and explain why?

On a padlet (www.padlet.com) the pupils enter their thoughts.

CO2 and temperatures

The purpose of the activity is to determine how the temperature affects the respiratory rate of crickets by monitoring the production of carbon dioxide with a CO2 gas sensor at different temperatures. The amount of CO2 produced will determine the effect of temperature on the metabolism of crickets.

The outline of the procedure for monitoring data collection of cold, intermediate and hot temperatures is provided to students divided into groups.

The students enter data into tables and create graphs to read, they focus on the study of climatic factors and the causes which are leading to an increase in temperatures.

The outline of the procedure

The CO2 sensor must be connected to the data collection device. If your CO2 gas sensor has a switch, set it to “Low” (0–10,000 ppm) placement. Change the data collection rate to 0.1 samples / second and the data collection duration to 600 seconds. Weigh 10 adult crickets, in a 600 mL beaker and record their in Data and Observations.

Data and Observations

Temperature (c °) Concentration (ppm / s) Respiration Rate (ppm/s/g)
Assigned range Current
5-10
10-15
15-20
20-25
30-35
40-45

Mass of crickets: 1.6g

Student collect data as follows:

1st stage:

The students, in the group, construct a graph and relate the measured CO2 concentration and temperature.

2nd stage:

The students prepare tubs with water at different temperatures, and

The groups collect data on respiration at 5–10 ° C, 10–15 ° C and 15–20 ° C.

3rd stage:

The students prepare a water bath for the desired temperature. This ensures that the crickets will remain at a constant and controlled temperature. How to prepare the water bath, get fresh water and ice.

4th stage:

The students mix cold water and ice in a 1 liter beaker.

The beaker is filled with approximately 600–700 ml of water.

The thermometer is placed in the water. The breathing chamber is in the water.

5th stage:

The student use a pipette to remove or add hot or cold water as needed.

6th stage:

Record the water bath temperature in Data and Observations.

Conclusions

Grilli che c(a)ontano! is focused on the study of climatic factors and the causes that lead to the increase in temperatures, aims to sensitize pupils to the issue of climate change consequences of environmental conditions.

Thanks to the use of the IBSE methodology, the pupils observed how mathematical relationships are concretely found in nature, or how life, as we know it, depends on physical and biological factors.

The purpose of this activity is to provide evidence on how the effects of global warming can cause negative impacts on ecosystems and on the metabolic activities of individuals.

Furthemore, the students the students reflect on the important theme of energy emitted by the sun that captured from the planet earth and used by individuals produces energy and work (metabolism).

Lamps: let’s be clear!

Distant teaching activity

Teachers: Mario Di Fonza in collaboration with Sabrina Nappi, Riccardo Di Pietro, Rosanna Busiello

Age: 14-16 years old. February-march

Let’s start with some questions! 

Which kind of lamps can we buy after the old incandescent bulb, invented by Edison, has retired? Which are the energy-efficient light bulbs and which ones emit less CO2 in the environment? Which parameter helps us understand how much light a light bulb really emits? How much money can we save using led lamps compared to incandescent lamps? How long can we keep the incandescent lamp on? How long does it take to pay back a led purchase? Students will learn different types of light bulbs on the market in order to know the consequent energy and money savings.

This activity could be introduced on April 22nd, “Earth Day”, a celebration of the environment and the protection of the Earth.

If you check the website http://www.golabz.eu/ you can read the descriptions of every activity.

We chose Inquiry Based Science Education (IBSE) methodology in which research is the most important task of pedagogical approach because it encourages students to ask questions and develop actions to solve problems and understand phenomena.

Subjects involved are maths,chemistry and physics

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